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I have the same issue with my Honda GCV160, cleaned carburetor and all components, new gas and spark plug. Runs perfect for the 1st two minutes then the engine has a miss to it. Can someone help figure this out?
Automatic governor speed control, no adjustment. Remove & clean spark plug. Remove air cleaner, replace filter if dirty. Check oil level. Remove float bowl from bottom of carb. ensure float hangs freely and gas flows. Push up on float, gas should stop. Remove pin holding float in mount, remove float and meter needle. Clean meter needle passage with small wire. Replace float and meter needle as require. Observe float bowl screw, see if a hole is present thru screw near head, clean with wire. Reassemble. prime, pull rope 4 times 1/2 way. Pull rope up to 10 times to start. ensure fresh gas. Always use Stabile in gas. Spray outside of carb with carb cleaner to ensure choke is free to operate where cable is attached.
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carb needs ajust in the jet area--let a pro du this cause if u git it tu lean engine damage can happen--the mid to high speed jets shud be lookd at--also caarb may b dirty-take air cleaner off and spray some solvent in ther--stil mite need rebuildn
Sounds like your main jet or needle rods are adjusted to lean. See if your putting out black exhaust when it starts to act up as then they would be running to rich. I'm betting on lean though.
This sounds like the typical lean mixture problem. In order to pass the EPA's emission requirements, Harley has to jet the carb extremely lean. This causes the engine "spit" through the carb, not idle well, and run hot. To solve this problem, you need to rejet the carb by going one or two steps richer on the low speed jet and raise the slide needle slightly. If this is something that has just started recently, it could be a small bit of trash partially blocking the low speed jet in the carb or your using a different formulation of fuel. You carb probably came with a #45 slow jet. I usually install either a #48 or in some cases,a #50 depending on the exhaust system on the bike. I remove the needle from the slide and install a 3mm flat washer under the stop on the needle to RAISE the needle approximately 0.023". This enrichens the mid-range of the carb just slightly. Of course, you need to carefully drill and remove the "anti-tamper" plug from the idle mixture adjustment screw and readjust the idle mixture once you get the engine back running.
Sounds to me as thought their is either a fuel problem (needs carburetor rebuilt/readjusted) or a considerable amount of oil is getting into the combustion chamber. I would tend to lean towards the fuel system. Have you run any fuel system cleaner thru it?
It sounds like the fuel mixture is running very Lean..There are usually two adjusting screw screws on the carburettor that control the mixture. A Larger one is for the Main Jet and a smaller one for the Idle Jet. There is also an adjusting screw on the throttle butterfly to control the idle speed.
To adjust setup, start with at least a half tank of fuel, and have engine at operating tempurature (That is warm but not overly Hot). As a starting point, loosen (anticlockwise) Main Jet screw about half a turn, to richen mixture,so that engine will run without choke. Run engine at full speed and adjust main jet for highest smooth speed without engine missing due to mixture being too lean or rich.
Allow engine to idle and the adjust Idle Jet Screw for smoothest idle. Idle Speed screw may have to be adjusted if idle speed is too high/low.
Sequence above may have to be repeated to get best running. If engine hesitates sometime when sudden load is applied but then picks up, try adjusting Main Jet by 1/8 to 1/4 turn richer until it handles the load without faltering.
Sounds as though the jetting is now too rich. Look at the spark plugs immediately after running the engine in the RPM range where is sputters. The spark plug color should be anywhere from a light tan, to a chocolate brown. Too dark = too rich. Too light in color = too lean. Adjust the jet size accordingly.
Yours must be one of the last years with a carby? Sounds like a low speed jetting problem. Bike may be running lean on the low speed jetting. Suggest starting by adjusting air mixture screw ( pilot air screw) out to 3-3.5 turns, very gently and by 1/4 turns to richen the idle mixture. Once the needle jet comes into play, she clearly runs nicely, so it's most likely that air screw as MoCo set it lean. Good Luck
fouling plugs and backfiring. Runs much better at high RPM's. I realize that the problem is likley worn needle jets after reading through forums. I am just looking for a little direction on what to do exactly. I haven't messed with carbs much and am concerned with messing something up. I have a Haynes manual, but still am lost.,Hi, I have a 98 M750 that I have had for 8 years and it has done 110,000Klm
(68,000 miles) when it had done about 20,000Klm it was doing the same thing
as yours fouling plugs and running rough at low speeds, so I took it to a good
dyno tuner and he found the bottom end rich and the top enp end lean, resetted the floats and rejetted all good again. So just find a good dyno tuner. Let me know how it is going after the tune up.,,,
fouling plugs and backfiring. Runs much better at high RPM's. I realize that the problem is likley worn needle jets after reading through forums. I am just looking for a little direction on what to do exactly. I haven't messed with carbs much and am concerned with messing something up. I have a Haynes manual, but still am lost.,Hi, I have a 98 M750 that I have had for 8 years and it has done 110,000Klm
(68,000 miles) when it had done about 20,000Klm it was doing the same thing
as yours fouling plugs and running rough at low speeds, so I took it to a good
dyno tuner and he found the bottom end rich and the top enp end lean, resetted the floats and rejetted all good again. So just find a good dyno tuner. Let me know how it is going after the tune up.,,,
fouling plugs and backfiring. Runs much better at high RPM's. I realize that the problem is likley worn needle jets after reading through forums. I am just looking for a little direction on what to do exactly. I haven't messed with carbs much and am concerned with messing something up. I have a Haynes manual, but still am lost.,Hi, I have a 98 M750 that I have had for 8 years and it has done 110,000Klm
(68,000 miles) when it had done about 20,000Klm it was doing the same thing
as yours fouling plugs and running rough at low speeds, so I took it to a good
dyno tuner and he found the bottom end rich and the top enp end lean, resetted the floats and rejetted all good again. So just find a good dyno tuner. Let me know how it is going after the tune up.,,,
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