Outboard Rough Idle

Rough idle yamaha 1973 6 hp outboard motor repair manual how to adjust idle on a honda 9. shortly after starting I started getting a beeping alarm from my warning system. When slowing down to an idle to approach a dock/pier or trying to troll, it runs rougher than a cob. You could also get a rough idea on the number of ppr by hooking up an oscilloscope to your tachometer wire and doing some calculation with your estimated idle rpms. Anyone have one of these, with a similar problem? Any sugguestions? ratherwhalering: posted 11-09-2001 01:03 PM ET (US). Each 4hp engine repair manual covers every aspect of repair. 9hk byta impeller 1978 mariner 9. We offer Mercury & Mercruiser products at lowest prices with superior service. hey john i stay in indianapolis and have the above rough idle at any rpm below 900 and hard cold start issues with carbureted 1968 307. If you are experiencing a rough idle or your RPM is running high, then there are a variety of reasons for why this could be happening. I suspect that the problem may have to do with the fact that the boat has been out of commission for a few weeks and wasn't used due to a broken steering cable. yamaha outboard idle control valve; yamaha outboard idle speed adjustment; yamaha outboard is idle to high; yamaha outboard motor idle adjustment; yamaha outboard stalling at idle; yamaha outboard stalls when in idle or in gear; yamaha outboards stall in idle; yamaha 50 hp 2008 idle rough; where is idle screw on 1997 yamaha 25hp. I have a 1993 mercury 25hp that im having an issue with. I was having some problems with the oil/fuel mixture alarm going off so I just had the VRO pump replaced and it ran fine on a trip out for halibut fishing about 2 weeks ago. 5 hp repair manual pdf download; mariner 3. 25 hp outboard idles rough. I also found a good alternative to the expensive "carburetor lead shot plug" from OMC Johnson/Evinrude. The motor will run but I need to manipulate the choke to keep it from stalling. The idle jet is in a little tunnel on the side of. 9HP outboard marine repair manual should possess basic knowledge of tools and mechanical theory. Use NGK or Nippon Denso plugs only in your Honda. Since less air will be going into the engine during its idle state, the car will react by shaking profusely. 1990 johnson 3. idle screw on 35 hp mercury outboard; how to set idle rpm on a 35 hp johnson; greasing johnson 35 hp; high sensor johnson outboard 35 hp; evinrude 35 hp idle ok running rough; evinrude 35 hp model 35753c overheating; evinrude outboard 35 hp 1992 model; evinrude outboard 35 hp hard starting; adjusting idle on 35 hp johnson outboard. This INSTANT DOWNLOAD 4 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. I have a 90hp yamaha 2 stroke o/b, at idle it runs rough, as if it is misfiring, it coughs and then stals. This INSTANT DOWNLOAD 150 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. Very rough idle with a repetitive cycle that is smooth for a couple of seconds then misses badly, occasionally stalling. So last week was the first time with the boat in the water, no problems, ran great. If it idles rough, and restarts easily without the primer after a 5 minute cool down- then it's rich. will run good at high speed. 1985 25 hp repair manual johnson 1986 25 hp rough idle johnson outboard motor 1987 25 hp manual free download johnson seahorse 1988 25 hp manual 1989 free johnson tracker 1990 25 hp hard to start when warm johnson tracker marine 1991 25 hp speciifications johson outboard 1992 25 hp maintenance tips jonhson outboard 1993 25 hp motor problems lower case drive unit schematic 2007 yamaha 1994 25. Worst after stationary idle, but also after moving at low to medium speed with closed throttle and then accelerating. 1990 175 hp johnson rough idle; 1990 johnson 175 hp idle problems; 1992 mercury outboard 175 hp oil injection; 1993 mecury 175 hp manual wide open throttle rpm 5000-5600; 1993 mercury 175 hp outboard alarm; 1994 175 hp mercury outboard mixture screws adjustment; 1996 175 hp mercury outboard float adjustment factory setting. ? i have a 25 johnson 1973 model. The Idle only needs to be 7 to 900 RPM with light load or AC on. Also the idle has been getting a bit rough and sometimes when you step on the accelerator from a low speed you get nothing, almost like it has no fuel. As with any other engine, this is the part which serves as the " combustion powerhouse" of every engine and works by blending air and fuel by employing the Bernoulli's Principle. 5 hp outboard won't start; 1994 johnson 3. Loose steering 9. My original engine was a 2001. Prime fishing season now and no boat for 3 weeks. OMC calls for L77J4 plugs, but customer installed J6C's to see if the idle improved. mercury 70 hp idle issues kennebunkport maine; mercury 70 hp outboard rough idle; mercury 70 hp outboard set idle mixture; removing head cover yamaha 70 2 stroke outboard; suzuki 70df 2008 4 stroke beeps codes; yamaha 70 two stroke spark plugs; yamaha 70hp 2 stroke 3 cylinder repair manual; yamaha 70hp 2 stroke cylinder head block. The 80 hp Mercury outboard is difficult to start and when started it idles at high rpms. Rough Idle Rough on slow take off. The actual procedure will differ or the amount that is suppose to be out is slightly different for each different motor. How to adjust controles on a 1979 mercury 35 hp outboard motor how to adjust idle on 1990 115hp eveinrude 2 stroke outboard mercury outboard motors 170hp idel screw location 2stroke johnson 1987 30 hp outboard lower unit diagram setting up idle screw on carburetor outboard where is the oil injection fail switch on a 2002 mercury 3. will be installing on wide 14ft john boat any suggestions thanks. I also get a lot of hesitation and studdering when I increase throttle. I have a 90 HP Mercury (year 2000). We tried to see if it would run and we could not even get the boat to plane. SUBSCRIBE SUBSCRIBE ADD TO FAV ORTIES. 2 HP Outboard. Get this INSTANT DOWNLOAD 3. A rough or uneven idle can be an indicator of an engine that is misfiring. It has been starting rough and stalling a lot at idle and when I put it into gear. suzuki carry idle screw. I just boat the boat and it runs great above 2,200 rpm. Mercury 140 hp outboard idle to high trim and tilt repair book 75 johnson compression test 1990 60 mariner rough idle spec on 1998 fast idle on a 15hp johnson 1985 johnson 25hp boat motor wont run 1998 mercruiser 5. This happened both in and out of gear but only when the engine was still cold, idle returned to normal once normal op temp had been reached. Worse problem is bad hesitation when accelerating after throttle at idle position, sometimes stalling. A downloadable version of the factory manual is available from this site. will only stay running if choke is pulled. 5 hp outboard won't start; 1994 johnson 3. Home / Forums / Say 2. 1991 johnson 140hp outboard idle speed adjustment #2255300 05/08/11 08:02 PM: Joined: Nov 2009. This is the aft jet. Consult your owner's manual to check items that may be unique to your motor. It runs great at everything other than idle. Express Auto Inspections says: While modern vehicles use a fuel injector system to burn gas, many older cars use a carburetor to process fuel. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburettor. Mitsubishi Mitsubishi Pajero Mitsubishi Pajero 1998 Workshop Manual. It had 120 hours when I purchased it and now it has 183 hours. It is a 4-stroke with electronic fuel injection. These engines have a history of piston failure, usually no. 8 hp engine still puzzled if these are good engines,with all the hype about vibration. However, enough information in 9. Mitsubishi - Pajero - Workshop Manual - 2008 - 2008. I ound dirt down in mine and it fixed it. 9 hp 4 stroke; set idle mixture screws on 2003 mecury 9. 30 hp johnson outboard stalling. Over time, the carburetor may cause the idle speed of the engine to fall outside the suggested range. It's function is to reduce pulses produced by both the fuel and air pumps. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. A misfire will cause the engine to momentarily stumble or lose rpms and then regain its normal engine speed. OF ROUNDS Three-gun installation Inboard gun 390 Center gun 260 Outboard gun 260 For extremely rough 33. Before putting the boat in the water, I changed the spark plugs (QL78YC) gapped to. 1991 johnson 140hp outboard idle speed adjustment #2255300 05/08/11 08:02 PM: Joined: Nov 2009. idle stabilizer on 1985 outboard 90 hp L6 idle stabilizer on 1985 outboard 90 hp L6. Finally at peace with my '95 Civic EX coupe after replacing PCV, checking coolant, vehicle speed sensor, FITV, NGK plugs, wires, Autozone Duralast Gold cap/rotor (real copper, make. Engine will not start or starting difficult 2. 4L V6 and 4. Volvo D12 Rough Idle. I first suspected fuel related and chan. mercury 70 hp idle issues kennebunkport maine; mercury 70 hp outboard rough idle; mercury 70 hp outboard set idle mixture; removing head cover yamaha 70 2 stroke outboard; suzuki 70df 2008 4 stroke beeps codes; yamaha 70 two stroke spark plugs; yamaha 70hp 2 stroke 3 cylinder repair manual; yamaha 70hp 2 stroke cylinder head block. I just found this board and have been lurking reading what looks like great advice. 8 hp rough engine operation torque specs for 1985 40 hp yamaha powerhead 1996 johnson 120 hp outboard repair manual yamaha 70 hp enrichment fuel pump parts what should compression be for 98 suzuki four stroke 50 ho john outboard 1r69c 1. It had 120 hours when I purchased it and now it has 183 hours. The Idle only needs to be 7 to 900 RPM with light load or AC on. What could cause rough idle on '04 merc outboard 50 4 stroke efi? Just pulled the boat out of winter storage, I winterized prior to storing ie: change oil, change lower case lube and added Stab-il fuel stabilizer to tank. 2' RIB seems to have a low idle speed in neutral that causes the engine to stall. INSTANT DOWNLOAD 1992 1993 1994 1995 1996 1997 1998 1999 2000 40HP, 40D and 40D2 Tohatsu outboard repair manual. This is my second go around with these carbs. 1996 mariner 25 hp compression test 1997 25 hp yamaha idles to low and stalls 1998 25 hp evinrude rough idle 1998 25 hp yamaha 4 stroke trim tilt manual lever image 1966 25 hp suzuki shifting linkage 1968 suzuki 25 hp temperature sensor 1972 suzuki dt25 25 hp outboard service manual 1971 yamaha 25 hp timing 2000 25 hp mercury outboard accelerator pump leaking fuel 2001 25 hp mercury outboard. For 2-Strokes, it can cause a rough or poor running condition. 1974 evinrude 25 hp repair manual. You may have to register before you can post: click the register link above to proceed. For example if you measure a 60hz freq. At Mid range and WOT it runs flawlessly. I was wondering how much water should be coming out the pee hole at idle. It even offers sub-idle trolling up to 150 RPM below normal idle speed. The 80 hp Mercury outboard is difficult to start and when started it idles at high rpms. It's a 98 model. Submerging the exhaust will cause excessive smoke and rough idle. The problem is that he had it sitting under a carport down in FL and used it only a couple times within a 10 year span. It can also help to diagnose rough idle issues and hundreds of other problems. 40HP Johnson Rough Idle. 3 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual delivered straight to your computer in seconds and fix your problem now. Q5/SQ5 MKI (8R) Discussion - Rough idle? - My car found a new way to tease me. Recently replaced throttle position sensor (the warning light indicated TPS problem) that warning has gone but idle problem still exists. 1985 25 hp repair manual johnson 1986 25 hp rough idle johnson outboard motor 1987 25 hp manual free download johnson seahorse 1988 25 hp manual 1989 free johnson tracker 1990 25 hp hard to start when warm johnson tracker marine 1991 25 hp speciifications johson outboard 1992 25 hp maintenance tips jonhson outboard 1993 25 hp motor problems lower case drive unit schematic 2007 yamaha 1994 25. 9hk byta impeller 1978 mariner 9. I also have a Honda BF2D. Mitsubishi - Pajero - Workshop Manual - 2008 - 2008. Then you should check all the vacuum hoses — a leaking hose can cause a too-lean mixture and a rough idle. I have had it save everything from outboards that won't stay running or run rough, to 2 stroke weed whackers doing the same, to cars with very rough idle and poor performance. I have played with the idle adjustment screws, but with optimal settings rpm is still below 700 rpm. The last couple of times out it has idled pretty rough and cut out a few times while at idle. Try turning the idle screw down on the carb, possibly the RPMs are higher than the clutch engagement range. What causes a rough idle? A rough idle can be caused by many different car faults. Idle Air Control System RPM lower than expected, What did you do about it. and that's bad so get a. I only have a few hours on it and today, while I had it out and shifted into neutral, the engine stalled and wouldn't restart. Outboard runs rough 7. At idle or low speeds it sputters and stalls. This motor starts, idles, runs, and performs great and is ready to use. yamaha outboard idle control valve; yamaha outboard idle speed adjustment; yamaha outboard is idle to high; yamaha outboard motor idle adjustment; yamaha outboard stalling at idle; yamaha outboard stalls when in idle or in gear; yamaha outboards stall in idle; yamaha 50 hp 2008 idle rough; where is idle screw on 1997 yamaha 25hp. Under power above 1000rpm, it seems to run fine, but anything below that, it simply will not idle and sounds like its not running on all cylinders, almost like a misfire. 6L V8 Reliability, flexibility, power and efficiency - all within your reach. i guess if the remote tank dont fix it i will throw in a new pump as the diaphragm isnt but like 20 bucks. Pull the idle jet by screwing counter clockwise with a small flat blade. There is no reduction in perfomance or fuel economy. A rough or uneven idle can be an indicator of an engine that is misfiring. Motorcycle manufacturer recommendations vary, but most issues can be isolated using a. 035, if those all check out, i would look into your timing. When your outboard starts right up, keeps running with throttle applied in neutral, but shuts down the moment you come back to idle speed in neutral, the issue is likely to be a sticky or broken AIS (automatic idle speed) valve. We have the Merc. If you experience engine stalling from a bad idle air control valve, then you won't be able to drive. What causes a bad idle on 50 hp outboard air into the engine causing it to idle rough. Outboard motor designs vary depending on make and model, but all operate on similar principles. 9 outboard with a remote mercury 3. Posts: 5,822. 2’ RIB seems to have a low idle speed in neutral that causes the engine to stall. By catfish1969 in forum Johnson Evinrude Outboard Archive Replies: 3 Last Post : 09-16 10-30-2007, 10:03 AM. Worst after stationary idle, but also after moving at low to medium speed with closed throttle and then accelerating. Vapor lock Any type of anti-siphon device must be located between the outboard fuel inlet and fuel tank outlet. 1985 johnson 30hp user manual 1986 johnson 30hp service manual onsale 1993 johnson 30hp won t idle 1994 yamaha 30hp outboard trim switch on motor not working down 1995 evinrude 30hp 2 stroke outboard 1995 evinrude 30hp two stroke schematic 1995 yamaha 30hp power tilt unit 1996 manual start 30hp mercury outboard wiring diagram 1997 evinrude 30hp shop manual 1999 30hp mariner outboard manual. at idle though, it has this random popping, almost like a back fire, accompanied by a quick puff of smoke out of the starboard side of the motor. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. At idle or low speeds it sputters and stalls. Model number look up. Outboard cuts out or hesitates upon acceleration 6. When your outboard starts right up, keeps running with throttle applied in neutral, but shuts down the moment you come back to idle speed in neutral, the issue is likely to be a sticky or broken AIS (automatic idle speed) valve. The car runs fine on the highway with plenty of power but coming home today up a steep hill 200 yards from my driveway the car slowed to 5 mph. There is another way to remedy this other than installing an idle stop solenoid which involves the vacuum advance and the ignition timing. 1995 30 hp 2 stroke mercury outboard idle settings. It's a 98 model. 5 / 2: 1968-1990: Outboard Water Pump Kit - 431785: Ultra, Excel 4: 1987-1988: Outboard Water Pump Kit - 431785. Get the boat from the shop and can drive it for about an hour or two with no problem up and down a full range of throttle positions, after a period of time when you shift to idle speed the motor stops. What causes a rough idle? A rough idle can be caused by many different car faults. Recheck timing and vacuum hook ups. Does he really have to invest in a workshop manual for such a trivial. Consult your owner's manual to check items that may be unique to your motor. It appeared to be a dead battery but after replacing the battery I realized it was the starter. What are common reasons my Mercury Mariner has a rough idle? While there are a variety of reasons your Mercury Mariner has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. It can also cause the water to come out of the exhaust, creating an idle issue. I've only had it out a few times. The motor often cannot run at high speed. I purchased a 1992 Tracker deep V 16' with an all original Evin-rude 40 HP (TE40ELENM ) outboard motor last year and from the start, it has had idling problems. Before putting the boat in the water, I changed the spark plugs (QL78YC) gapped to. I have a 1996 Johnson 90 V4 VRO outboard. The RPMs would hover a notch below 500 and when the rough idle would kick in, you could. The idle speed screw should be adjusted to open the throttle shutter a small amount. Use NGK or Nippon Denso plugs only in your Honda. This is the aft jet. The engine is running but the car just coasts. We offer Mercury & Mercruiser products at lowest prices with superior service. 25 hp yamaha outboard idle adjustment. Runs great wide open. at idle though, it has this random popping, almost like a back fire, accompanied by a quick puff of smoke out of the starboard side of the motor. Otherwise it is rough and stumbles. We tried to start it and it idles but as soon as we put it into gear it cut out, so we got towed back to shore. The car idles rough when in any gear but park and neutral. 7 efi in it and i had the same problem, i ended up having to advance the timing on it, which i did just by turning the distributor cap a little bit and listening to. 9; rough idle 2013 suzuki thl 9. View and Download Mercury 225 service manual online. 30 hp johnson outboard stalling. Original review: Oct. A problem with fuel delivery, spark plug operation or metering of the air-fuel charge can cause problems at idle that may not be obvious at higher rpm ranges. 1996 tohatsu 40hp outboard head bolts. It didn't make much difference. will run good at high speed. 1997 tohatsu 40hp outboard tilt trim fluid replacement. Model number look up. 84' Mercury 2. 1991 johnson ocean runner 25 hp. Top end/power is excellent, above 2000 RPM. The engine's carburetor is designed to supply fuel to the engine. After rebuilding these carburetors I still had a rough idle. From the looks of the throttle mechanism, ignition timing seems crucial but I found nothing useful on the internet. As with any other engine, this is the part which serves as the " combustion powerhouse " of every engine and works by blending air and fuel by employing the Bernoulli's Principle. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburetor. Honda power equipment outboard motor owner's manual. In January 1940, 5 new Mercury Outboard Models were introduced; the K1, K2, K3, K4 and K5 Outboard Motors with prices ranging from $42. Mercury 140 hp outboard idle to high trim and tilt repair book 75 johnson compression test 1990 60 mariner rough idle spec on 1998 fast idle on a 15hp johnson 1985 johnson 25hp boat motor wont run 1998 mercruiser 5. 9 carburetor 2004 mercury 9. This INSTANT DOWNLOAD 8 horsepower Mercury, Mariner, Yamaha, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. Engine has poor performance, bogging, hesitation, backfires etc. The air/fuel mixture is disrupted which can cause the engine to jump up and down. My optimax runs great at anything above idle (idle in neutral, idle in gear, forward or reverse). Many things can affect idle quality. outboards, please go to MercuryMarine. I was wondering how much water should be coming out the pee hole at idle. It also takes a while to build up speed when I first take off. 9 hp 4 stroke; set idle mixture screws on 2003 mecury 9. Engine has a rough idle 3. DOWNLOAD Yamaha outboard marine repair manuals straight to your computer in seconds—fix your problems now. tunes MEMBER since 5/25/08 PROFILE BLOCK USER. This week, not so good. The duty cycle is supposed to reflect the way outboards are really used, and surveys show that most outboard boaters spend a lot of time trolling, in no-wake zones, and otherwise puttering. I have had it checked and they said it is set at the right specs. When submerged at lake or in tub, hard to start, will not idle, and runs rough. mercury 70 hp idle issues kennebunkport maine; mercury 70 hp outboard rough idle; mercury 70 hp outboard set idle mixture; removing head cover yamaha 70 2 stroke outboard; suzuki 70df 2008 4 stroke beeps codes; yamaha 70 two stroke spark plugs; yamaha 70hp 2 stroke 3 cylinder repair manual; yamaha 70hp 2 stroke cylinder head block. 1983 mercury 35 hp Not rated yet I have 1983 mercury outboard 35hp, in idle speed will push the boat, but as soon i put it in full throttle it just rev up the motor and would not pushes … 2002 50 hp mercury runs slow but dies when trying to accelarate Not rated yet have a 2002 50 hp mercury outboard. Each 8hp engine repair manual covers every aspect of repair. I have a 1989 40 HP Johnson that runs great at anything over an idle speed. DOWNLOAD Yamaha outboard marine repair manuals straight to your computer in seconds—fix your problems now. This INSTANT DOWNLOAD 150 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. The Honda BF115 is a 4-stroke 115 hp marine engine. These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989—specifically 45-HP to 115-HP models. 9 hp engine idle mixture screw; sherly 2006 suzuki 4 stroke outboard oil filter. It is a beep ,beep , beep warning. 1995 30 hp 2 stroke mercury outboard idle settings. my 1995 70hp johnson outboard wont idle and dies when i put in gear. Submerging the exhaust will cause excessive smoke and rough idle. It seems to correct itself after it is warmed up and will run good at all RPM’s until it is shut off for any length of time. A downloadable version of the factory manual is available from this site. Under power above 1000rpm, it seems to run fine, but anything below that, it simply will not idle and sounds like its not running on all cylinders, almost like a misfire. tunes MEMBER since 5/25/08 PROFILE BLOCK USER. It runs great at everything other than idle. View Profile View Forum Posts View Articles Senior Member Join Date Jul 2009 Posts 1,287. If your motor has an idle adjustment, turn the control until the engine idles smoothly and doesn't die when you shift into gear. It only takes a minor problem like a fouled spark plug to cause your engine to vibrate. Yamaha Outboard engine stalls 4. When idle speed changes significantly or stalling on throttle release occurs, a problem is indicated. There where several advancements from 1969-1974 in Evinrudes, related to fuel/ignition/gear case design/thru prop exhaust, so the exact year might be helpful. 3, and one of the symptoms is hesitation, and rough idle. This INSTANT DOWNLOAD 6 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. DOWNLOAD 70HP Outboard Repair Manual Sunday, December 29, 2013. Not that this helps any but when I asked a few boat guys about my 89 merc 200 about it's rough idle they all said "typical mercury of that era". Its got a 98 50hp johnson 2 cyl 2 stroke. This INSTANT REPAIR MANUAL DOWNLOAD for the Mercury-Mariner, Johnson-Evinrude, Suzuki, Honda, Yamaha 70 HP outboard engines were designed primarily for factory service 70 HP outboard technicians in a properly equipped shop. But the carb re-build should have fixed it? Pull the cover. I guess that is the reason it will not idle and when it starts I have to throttle it up immediately to keep it running. Rough Idle Rough on slow take off. Each 8hp engine repair manual covers every aspect of repair. At 20 hrs the FSM failed. The idle jet is in a little tunnel on the side of. By catfish1969 in forum Johnson Evinrude Outboard Archive Replies: 3 Last Post : 09-16 10-30-2007, 10:03 AM. 9 hp; setting idle on 05 9. Hello, just joined and first post as I am troubleshooting a frustrating idle issue. It even offers sub-idle trolling up to 150 RPM below normal idle speed. Volvo D12 Rough Idle. 5 hp repair manual pdf download; mariner 3. Here are some: Stalls at idle, stalls when I put the clutch in, stalls when I turn a corner, misfires, surges, no power, cuts out, no power at top revs, runs rough, etc. Membership is free but required in order to post to our forums, classifieds, reviews and photo gallery. When it comes to adjusting the idle state on Johnson Outboard motors, the part involved would most definitely have to be the Carburetor. This happened both in and out of gear but only when the engine was still cold, idle returned to normal once normal op temp had been reached. I was wondering how much water should be coming out the pee hole at idle. It also takes a while to build up speed when I first take off. Many things can affect idle quality. The IAC actuator is an electrically controlled device, which gets its. But at idle (750-1000 RPM's, little to none comes out the pee hole. 8 hp engine still puzzled if these are good engines,with all the hype about vibration. Very rough idle with a repetitive cycle that is smooth for a couple of seconds then misses badly, occasionally stalling. Opening any of the outboard idle screws, even 1/2 turn, makes the idle to down, so I left all of them closed. Hi, I own a 07 115 evinrude etec that has been acting up lately. Also the idle has been getting a bit rough and sometimes when you step on the accelerator from a low speed you get nothing, almost like it has no fuel. I have a 1989 40 HP Johnson that runs great at anything over an idle speed. This INSTANT DOWNLOAD 4 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. 1990 175 hp johnson rough idle; 1990 johnson 175 hp idle problems; 1992 mercury outboard 175 hp oil injection; 1993 mecury 175 hp manual wide open throttle rpm 5000-5600; 1993 mercury 175 hp outboard alarm; 1994 175 hp mercury outboard mixture screws adjustment; 1996 175 hp mercury outboard float adjustment factory setting. My Yamaha Outboard 175 hp motor recently started to sputter and then die when I am in idle. 9 hp engine idle mixture screw; sherly 2006 suzuki 4 stroke outboard oil filter. The Honda BF115 is a 4-stroke 115 hp marine engine. Mitsubishi - Pajero - Workshop Manual - 2015 - 2015. 2L engine (RPOs L83, L86, LT1, LV3), there may be a condition of a rough idle or a vibration at idle in gear. Alarm beeping on mercury efi 150 outboard. Outboard has poor deceleration 5. Most often an input sensor has failed or the throttle body has a problem. If its been sitting for a month or so, the VRO pumps can leak oil into the fuel system causing them to be excessively smokey on start up and idle rough. When its at idle it is only running on one cylinder. ORIGNAL POST. The misfire will usually reappear, either under specific operating conditions or randomly. 0 litre seapro, 250 efi, 3. 1973 johnson 25 hp outboard idle adjustments. 9 horsepower Mercury outboard will not activate; e. The general design of most outboard carburetors is basically the same with the major difference being the presence of mixture- adjusting. Over the winter I had my Yamaha 4hp fourstroke (F4MSHD-2005) serviced and then I just ran it for the first time 4 weeks ago. Honda power equipment outboard motor owner's manual. This is basically what powers up your outboard motor and therefore, has to be. keypond Posts: 2,017 Captain. When it warms up, it starts first go. Each 175hp engine repair manual covers every aspect of repair. It is a 4-stroke with electronic fuel injection. Tried reattaching it and it still ran rough: idles high, misses, backfires a bit. DOWNLOAD 30 horsepower Repair Manual Suzuki Yamaha Mariner Evinrude Johnson Mercury Honda 69. I don't have a tach but i'd say at everything over 2000 rpm. But the carb re-build should have fixed it? Pull the cover. The mechanic says it is only running 5 of the 6 cylinders and the powerpack needs replacing. 2' RIB seems to have a low idle speed in neutral that causes the engine to stall. Figured Id share this since Ive seen a good amount of people here complain about a rough idle. It seems to correct itself after it is warmed up and will run good at all RPM’s until it is shut off for any length of time. Battery was low enough I had to jump across from a trolling motor battery. Last 2 times out it was pretty chilly (and boat is stored in unheated garage) maybe the engine is a little tempermental but even when I let the engine run for a couple. The Idle only needs to be 7 to 900 RPM with light load or AC on. The problem is that he had it sitting under a carport down in FL and used it only a couple times within a 10 year span. - Answered by a verified Marine Mechanic. 2' RIB seems to have a low idle speed in neutral that causes the engine to stall. I've got a 1996, 200HP Johnson (Model J200TXEDR) that idles rough and stalls. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburettor. A downloadable version of the factory manual is available from this site. The first step I take to solve a rough idle issue is to start with a good tune up. As with any other engine, this is the part which serves as the " combustion powerhouse" of every engine and works by blending air and fuel by employing the Bernoulli's Principle. This is the case on my bass boat as well. If all is normal, 2-stroke idle is acceptable. Mercury 140 hp outboard idle to high trim and tilt repair book 75 johnson compression test 1990 60 mariner rough idle spec on 1998 fast idle on a 15hp johnson 1985 johnson 25hp boat motor wont run 1998 mercruiser 5. It even allows for sub-idle trolling. I replaced fuel filters, visually inspected fuel lines and connections and checked spark plugs. 9 hp suzuki outboard; setting suzuki 9. The duty cycle is supposed to reflect the way outboards are really used, and surveys show that most outboard boaters spend a lot of time trolling, in no-wake zones, and otherwise puttering. OMC calls for L77J4 plugs, but customer installed J6C's to see if the idle improved. 9 hp engine idle mixture screw; sherly 2006 suzuki 4 stroke outboard oil filter. 5 hp outboard won't start; 1994 johnson 3. Idle Air Control System RPM lower than expected, What did you do about it. Get this INSTANT DOWNLOAD 3. 1973 johnson 25 hp outboard idle adjustments. These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989—specifically 45-HP to 115-HP models. DOWNLOAD 15HP Outboard Repair Manual Mercury Yamaha Johnson Evinrude Suzuki Honda 117. SUBSCRIBE SUBSCRIBE ADD TO FAV ORTIES. Failure of the Water PumpOne of the most common reasons behind overheating in outboard motors isfailure of the water pumps. Each 150hp engine repair manual covers every aspect of repair. When I got home with the muff's on I tried it again and it worked fine. However, I find it that the engine idles a bit rough and sometimes turns off when on idle. Outboard motor designs vary depending on make and model, but all operate on similar principles. johnson 15 hp outboard rough running. Fast idle adjustment on 1993 mercury outboard motor xr6 set idle speed on evinrude 9. The engine starts fine, 2-3 pulls cold start and he is on. If the engine will run( has to for the stuff to work obviously )2+4 is my go to pour in fix in a can. By mike gray in forum Johnson Evinrude Outboard Archive Replies: 1 Last Post: 05-16-2006, 03:56 PM. To start viewing messages, select the forum that you want to visit from the selection below. Best if you can just let the outboard run at a fast idle all afternoon or longer, (on the boat tied up in a slip and left in gear is the best), and then continue to use up the fuel. 40HP Johnson Rough Idle. See what others are asking about their Suzuki Vitara. What I mean by that is when I fire it up for the first time at the ramp, it idl. SUBSCRIBE SUBSCRIBE ADD TO FAV ORTIES. It seems to correct itself after it is warmed up and will run good at all RPM’s until it is shut off for any length of time. Original review: Oct. This INSTANT DOWNLOAD 8 horsepower Mercury, Mariner, Yamaha, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. I have had one uneventful trip so far. Can a bad crank seal cause rough idle in a mercury outboard boat motor I have a 1982 9. I was wondering how much water should be coming out the pee hole at idle. Rough idle yamaha 1973 6 hp outboard motor repair manual how to adjust idle on a honda 9. 2001 40hp tohatsu outboard valve adjustment specs. Relationship between temperature and running OK, rough idle at start and missing which clears itself, all point to fuel air mix too rich. The problem is that he had it sitting under a carport down in FL and used it only a couple times within a 10 year span. Motor will not. This INSTANT DOWNLOAD 6 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. For 2-Strokes, it can cause a rough or poor running condition. where is the fast idle switch on a 1992 50hp johnson outboard; evinrude 18 runs rough and is hard to start 1973 1990 Johnson Evinrude 2 to 40 HP Service. 25 hp evinrude rough idle. If I disconnect the number one spark plug wire, the engine will stabilize and idle on two cylinders. 0l tks fuel mixture adjustment how to change valves on a 1996 80hp mercury 2 stroke out board 2004 mercruiser 350 mag mpi tow sports work shop manual johnson 40 hp outboard fuel pump idle speed control 25 hp yamaha outboard electric start won't fire how to check. 2000 tohatsu 40hp tilt trim assembly fluid. It is not always easy to diagnose the cause because there are so many factors involved here. Also the idle has been getting a bit rough and sometimes when you step on the accelerator from a low speed you get nothing, almost like it has no fuel. I already changed the fuel filters. Does anyone know what the cause and possible cure is for this problem. 2001 40hp tohatsu outboard valve adjustment specs. 3hp manual also contains advance troubleshooting to help diagnose and pinpoint any mechanical problem. 1995 30 hp johnson won't idle. rough idle, hard start This is a discussion on rough idle, hard start within the Drivetrain forums, part of the CJ Forums category; So, I had a mechanic get my Jeep to pass DEQ. Each 6hp engine repair manual covers every aspect of repair. 9 hp; setting idle on 05 9. 60 Degree V6 Optical ignition (OIS 2000) 1991-2003 model years. This article is for a hunting or erratic idle, the original idle speech was for a 'shaking' or 'rough' idle. At 20 hrs the FSM failed. But at idle (750-1000 RPM's, little to none comes out the pee hole. When submerged at lake or in tub, hard to start, will not idle, and runs rough. Overall length is 117. Johnson outboard motors are used on a number of different powerboats, both by casual boaters and professionals. Re: Root cause of Mercury 2-strokes' rough idle Rough idle is a subjective statement. This engine has only 609 hours. DOWNLOAD 1973-2001 40HP Outboard Repair Manual Mercury Johnson Evinrude Suzuki Honda mercury 40hp engine guide 1995 mercury 40hp outboard idle speed 1996 40hp johnson outboard drain and vent plug diagram 1996 evinrude outboard 40hp, overheating 1996 mercury 40hp oil/fuel delivery 1996 suzuki df 70 40hp 1996-1997 yamaha 40hp service manual. I was having some problems with the oil/fuel mixture alarm going off so I just had the VRO pump replaced and it ran fine on a trip out for halibut fishing about 2 weeks ago. will run good at high speed. The mechanic says it is only running 5 of the 6 cylinders and the powerpack needs replacing. Rough Idle Rough on slow take off. 1997 tohatsu 40hp outboard tilt trim fluid replacement. I was having some problems with the oil/fuel mixture alarm going off so I just had the VRO pump replaced and it ran fine on a trip out for halibut fishing about 2 weeks ago. 1966 40HP outboard engine ran well last fall, but over the winter it developed a rough idle and now sometimes stalls. Ensure that the outboard motor is in an upright and level position. 2L engine (RPOs L83, L86, LT1, LV3), there may be a condition of a rough idle or a vibration at idle in gear. 30 hp johnson outboard stalling. Its got a 98 50hp johnson 2 cyl 2 stroke. 0l tks fuel mixture adjustment how to change valves on a 1996 80hp mercury 2 stroke out board 2004 mercruiser 350 mag mpi tow sports work shop manual johnson 40 hp outboard fuel pump idle speed control 25 hp yamaha outboard electric start won't fire how to check. The idle jet is in a little tunnel on the side of. We tried to see if it would run and we could not even get the boat to plane. 5) Rebuilt carbs 6) Emptied fuel tank 7) Emptied oil tank (refilled them. I fought this for over 15 years. Under power above 1000rpm, it seems to run fine, but anything below that, it simply will not idle and sounds like its not running on all cylinders, almost like a misfire. In the "Old" days, that was a stuck choke. Someone has to know something about these 2 stroke outboards. The misfire will usually reappear, either under specific operating conditions or randomly. Yamaha Outboard is overheating, overheats over heats, running hot 8. I have a 1997 Mercury 150 EFI outboard that I just bought. outboards, please go to MercuryMarine. DOWNLOAD 25HP Repair Manual Mercury Johnson Suzuki Yamaha Evinrude Mariner 44. To start viewing messages, select the forum that you want to visit from the selection below. Sportsmen used these gear driven outboards to haul themselves and their gear long before shallow water boat motors came into the market, and the majority of them still do. Outboard Carburetor Kit - 439071: 3: 1952-1963: Outboard Carburetor Kit - 439071: 3: 1964-1967: Outboard Carburetor Kit - 439070: 3: 1989-1997: Outboard Carburetor Kit - 439071: 4: 1965-1967: Outboard Carburetor Kit - 439071: 4: 1965-1967: Outboard Carburetor Kit - 439072: 4: 1979-1980: Outboard Carburetor Kit - 439072: 4: 1979-1980: Outboard. s/n year hp cyl beg. It restarts but will die almost immediately after shifting to reverse. DOWNLOAD 25 horsepower Repair Manual Johnson Yamaha Mercury Evinrude Mariner Suzuki 232. Outboard that runs somewhat rough The WoodenBoat Forum is sponsored by WoodenBoat Publications , publisher of WoodenBoat magazine. 2' RIB seems to have a low idle speed in neutral that causes the engine to stall. In January 1940, 5 new Mercury Outboard Models were introduced; the K1, K2, K3, K4 and K5 Outboard Motors with prices ranging from $42. 9 hp 2 stroke cold start problem. I am new to outboards and this engine mounted on a 10. If the engine will run( has to for the stuff to work obviously )2+4 is my go to pour in fix in a can. When the lower unit is submerged, backpressure on the underwater exhaust will lower the idle speed. There where several advancements from 1969-1974 in Evinrudes, related to fuel/ignition/gear case design/thru prop exhaust, so the exact year might be helpful. torque specs for v6 150 johnson outboard 2 stroke; 1994 yamaha 5hp 4 stroke outboard motor carburetor diagram; mercury xr6 rough idle fix; how to adjust carbs on a mariner 40 hr; trouble shooting mercury impeller repair; wire identification for2006 60 hp evinrude; how to change coils on a 1974 johnson 50hp outboard; 1981 evinrude 35 hp seahorse. Even after starting, it remains idle - sometimes changing the choke position helps, but not always. My outboard without the thermostat 2008 yamaha 70tlr runs rough s at boat rough idle troubleshooting 2005 yamaha 150 runs rough at idle 150 hpdi surging at idle has me stumpedI Have A 2003 Yamaha 50hp Outboard Two Stroke Injected It2008 Yamaha 70tlr Runs Rough S At Idle But Great Wot The94 Yamaha 55hp 2 …. With engine running in “Forward” gear, reduce engine speed to idle. Veteran Posts: 105 (75. My Yamaha Outboard 175 hp motor recently started to sputter and then die when I am in idle. 1998 johnson outboard idle problems for 15hp. For 2-Strokes, it can cause a rough or poor running condition. Alarm beeping on mercury efi 150 outboard. Topic: Mercury 200 EFI Rough idle: rkhjr66: posted 04-15-2007 12:38 PM ET (US) I have a 1994 MERCURY 200 EFI that will not idle smooth. Thank you for any help or ideas you can offer! I have two 2010 DF90As and earlier in the fall the stbd motor started to develop a low, rough sounding idle, but the tach would still read the normal 500-600RPMs. Try turning the idle screw down on the carb, possibly the RPMs are higher than the clutch engagement range. It features our Variable Trolling RPM Switch(VTS®), that allows for precision adjustment of trolling speeds from 750 to 1050 RPM in 50-RPM increments. When the lower unit is submerged, backpressure on the underwater exhaust will lower the idle speed. I put the boat in today to take it for a ride, when I started it up the motor sounded perfect but when I put it in gear the motor seemed to run rough and got alot noiser when idling. 0 service manual 1992 evinrude enrichment pump 1995 70 hp johnson carb low idle mixture mariner. 9 hp engine idle mixture screw; sherly 2006 suzuki 4 stroke outboard oil filter. These lightweight 40hp and 50hp outboard motors are ideal for flats, bay boats, inflatables, fishing boats, and pontoons. The duty cycle is supposed to reflect the way outboards are really used, and surveys show that most outboard boaters spend a lot of time trolling, in no-wake zones, and otherwise puttering. The car idles rough when in any gear but park and neutral. Re: Root cause of Mercury 2-strokes' rough idle Rough idle is a subjective statement. Relationship between temperature and running OK, rough idle at start and missing which clears itself, all point to fuel air mix too rich. Not that this helps any but when I asked a few boat guys about my 89 merc 200 about it's rough idle they all said "typical mercury of that era". 9hk byta impeller 1978 mariner 9. 9HP outboard marine repair manual should possess basic knowledge of tools and mechanical theory. During the last 10-15 hrs the engine has developed a miss at idle. 9 hp engine idle mixture screw; sherly 2006 suzuki 4 stroke outboard oil filter. It features our Variable Trolling RPM Switch(VTS®), that allows for precision adjustment of trolling speeds from 750 to 1050 RPM in 50-RPM increments. Pull the idle jet by screwing counter clockwise with a small flat blade. I will start at the beginning. From the looks of the throttle mechanism, ignition timing seems crucial but I found nothing useful on the internet. Opening any of the outboard idle screws, even 1/2 turn, makes the idle to down, so I left all of them closed. Mercury Carburetor Adjustments. My outboard engine on my pontoon starts but idles rough and as I back out of the slip it dies. At 20 hrs the FSM failed. Recently replaced throttle position sensor (the warning light indicated TPS problem) that warning has gone but idle problem still exists. Hello, just joined and first post as I am troubleshooting a frustrating idle issue. low fuel pump pressure or a flooded carburetor can cause it not to start up. Outboard will not start 9. Giving it gas has no reaction. It’s highly recommended to follow the idle mixture adjustment procedures in the factory repair manual. In the "Old" days, that was a stuck choke. On muffs and water hose it runs like a champ but put it under a load it the river it idles rough, has slow response to the throttle, and when the throttle is wide open im only traveling at half speed. Consult your owner's manual to check items that may be unique to your motor. The duty cycle used by the EPA to measure outboard emissions is weighted 40 percent to operation at idle speed but just six percent at wide-open throttle. The next morning we started up and the bad engine was idling rough and definately had a problem. DOWNLOAD 15HP Outboard Repair Manual Mercury Yamaha Johnson Evinrude Suzuki Honda 117. Veteran Posts: 105 (75. will be installing on wide 14ft john boat any suggestions thanks. I only have a few hours on it and today, while I had it out and shifted into neutral, the engine stalled and wouldn't restart. It runs great at everything other than idle. 1991 johnson 140hp outboard idle speed adjustment #2255300 05/08/11 08:02 PM: Joined: Nov 2009. I have had carbs rebuilt and replaced the stattor and the power pac replaced all plugs, changed fluid in lower unit etc and put. The actual procedure will differ or the amount that is suppose to be out is slightly different for each different motor. suzuki 50 hp 2000 drops cylinder pressure runs rough; suzuki outboard motor gas and oil ratios 2004 50hp; four stroke 50hp suzuki motor stalls at idle when running hot; suzuki 50 outboard power tilt fluid; how to adjust air/fuel ration on suzuki outboard 50 hp; how to adjust idle on suzuki df50 outboard; how to change oil in lower unit suzuki 50hp. The Honda BF115 is a 4-stroke 115 hp marine engine. These lightweight 40hp and 50hp outboard motors are ideal for flats, bay boats, inflatables, fishing boats, and pontoons. On a test water hose it will shift in gear and continue running but on the lake it cuts off. 8 hp engine still puzzled if these are good engines,with all the hype about vibration. The Forum is a free service, and much like the "free" content on Public Radio, we hope you will support WoodenBoat by subscribing to this fabulous magazine. If the engine will run( has to for the stuff to work obviously )2+4 is my go to pour in fix in a can. See what others are asking about their Mercury Mariner. Decided best course would be to remove carb and. 1 thought on "Solving Honda Idle Issues, Rough Idle" Nigel. Quite often an old fuel line is found cracked, allowing air into the system, causing the primer ball to lose it's prime and your Outboard to suffer from poor performance brought on by poor fuel flow. When submerged at lake or in tub, hard to start, will not idle, and runs rough. Runs great wide open. A misfire may occur when your engine is idling, causing a rough or uneven idle. I went to river yesterday it was hard to get started and it started up but didnt seem to want to idle. The last couple of times out it has idled pretty rough and cut out a few times while at idle. By mike gray in forum Johnson Evinrude Outboard Archive Replies: 1 Last Post: 05-16-2006, 03:56 PM. Home / Forums / It runs on high idle but overall has hard starting and a rough idle then dies on slow idle. Longer warm up doesn't seem to help. com, the #1 full featured boating site in the world. I was having some problems with the oil/fuel mixture alarm going off so I just had the VRO pump replaced and it ran fine on a trip out for halibut fishing about 2 weeks ago. Use NGK or Nippon Denso plugs only in your Honda. 90 hp 4 stroke EFI and the manual says that if that exhaust hole is under water, the engine will idle rough. Outboard engine will not stop 6. My Yamaha Outboard 175 hp motor recently started to sputter and then die when I am in idle. It seems to correct itself after it is warmed up and will run good at all RPM’s until it is shut off for any length of time. It can also help to diagnose rough idle issues and hundreds of other problems. 70 johnson idle very rough dies when at. Step 1, check for air in the cooling system. Mark Channels Read. I have seen this many times, guys putting around the lake with their outboard fully trimmed in, and the motor is smoking and running erratically. Used Outboards from 2hp to 350hp. I bought a boat with a 2001 90hp mercury 2 stroke on friday. If its been sitting for a month or so, the VRO pumps can leak oil into the fuel system causing them to be excessively smokey on start up and idle rough. Idle speed should be about 750 in gear, with the boat in the water, which means in neutral, motor running on the muffs, set it to around 900-1000. April 7, 2020 at 2:18 am Reply. 2' RIB seems to have a low idle speed in neutral that causes the engine to stall. I "power tune"ed the carb, replaced the plugs, and revamped the dash ignition wiring. Consult your owner's manual to check items that may be unique to your motor. I suspect that the problem may have to do with the fact that the boat has been out of commission for a few weeks and wasn't used due to a broken steering cable. Been thinking about Tohatsu 9. Below are the four most common. It features our Variable Trolling RPM Switch(VTS®), that allows for precision adjustment of trolling speeds from 750 to 1050 RPM in 50-RPM increments. 2001 40hp tohatsu outboard valve adjustment specs. It appeared to be a dead battery but after replacing the battery I realized it was the starter. 9 hp 4 stroke; set idle mixture screws on 2003 mecury 9. Under power above 1000rpm, it seems to run fine, but anything below that, it simply will not idle and sounds like its not running on all cylinders, almost like a misfire. It had 120 hours when I purchased it and now it has 183 hours. 5 hp repair manual pdf download; mariner 3. Quieter Than the Competition. Move mixture control to "IDLE CUT. 3 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual delivered straight to your computer in seconds and fix your problem now. This INSTANT DOWNLOAD 175 horsepower Mercury, Mariner, Yamaha, Suzuki, Johnson and Evinrude outboard engine repair manual was designed for do-it-yourself mechanics and factory trained technicians. Get this INSTANT DOWNLOAD 3. Each 6hp engine repair manual covers every aspect of repair. I also have a Honda BF2D. Screw it all the way in and unscrew it about a turn and a half and run the motor and start from there. Outboard cuts out or hesitates upon acceleration 6. At wide-open throttle, we were burning about nine gph while running at close to 40 mph. This is the aft jet. Topics: 3,203 Posts: 8,884 Members: 8,777 Active. Honda power equipment outboard motor owner's manual. At idle it's rough where everyone comments on it and on occasion it stalls too more so recently. Welcome to the Internet's premier site for boat motors!This site is part of iboats. outboard runs great but will no go above idle in gear Posted by TutHillTiger on 8/4/14 at 1:27 pm. Honda power equipment outboard motor owner's manual. These idle mixture adjustment tuning procedures apply the Mercury outboards manufactured between 1965 thru 1989—specifically 45-HP to 115-HP models. The last couple of times out it has idled pretty rough and cut out a few times while at idle. A downloadable repair manual is a digitally delivered book of instructions that provides step-by-step maintenance, troubleshooting and repair procedures. my question is will a combination of a toque converter out of a v6 700r4 stall be too low (1000-1100) a oem alternator from 3. 2007 Yamaha outboard 4 stroke will not idle and engine dies. 9 outboard; service manual suzuki 9. Tried reattaching it and it still ran rough: idles high, misses, backfires a bit. When an outboard motor runs at speed but cannot hold an idle, it usually indicates a problem with the carburettor. Over the winter I had my Yamaha 4hp fourstroke (F4MSHD-2005) serviced and then I just ran it for the first time 4 weeks ago. My mercury 150 optimax is rough at idle, but once it has been out a run the idle is ok. When the cars idle gets rough, it hard to comprehend the related causes. While the boat is in neutral, I can rev the engine up to 5-6000 Rpm, sounds perfect. Mercury Carburetor Adjustments. my 70hp evinrude outboard wont start.
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