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Kohler Command Pro 9.5 hp problem


gungfudan

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A friend of mine has a bulldog ATV that has a Kohler Command Pro 9.5 hp engine on it. I have removed the carburetor and cleaned it. When I cleaned it I made sure that every hole was clear and it is still doing the same thing.
Here is the symptoms when you stomp on the gas the engine dies like it is floodind out or sucking in too much air no matter if you just started it or have been running it for a while. We have swapped spark plugs multiple times and some plugs do not even let it start. Also after a while of running it will start to backfire and sputter. I am leaning towards the coil spacing or the coil is going bad.

I have worked on several small engines and I always get them running and they have been in a lot worse shape than this engine is. He uses this just about everyday and runs 100% gas in it.

Any thoughts.
 


adsm08

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Replace the condenser.

Wouldn't hurt to replace the points too, if it has them.
 

rusty ol ranger

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A legend to the old man, a hero to the child...
Is it gravity fed?

Does it seem to do it worse as the fuel level drops?

It could be the coil, but ive had a few gravity fed mowers do this when the vent hole or fuel filter would plug.

My Sportsman 500 did it when the vacuum fuel pump wasnt hooked up.
 

gungfudan

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Is it gravity fed?

Does it seem to do it worse as the fuel level drops?

It could be the coil, but ive had a few gravity fed mowers do this when the vent hole or fuel filter would plug.

My Sportsman 500 did it when the vacuum fuel pump wasnt hooked up.
it is gravity fed. It does not make a difference with low or full tank.
 

ericbphoto

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This is all I know about that. Currently waiting for a carb kit to get my tiller running.

RecentMisguidedHarrier-size_restricted.gif
 

b1pig

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First thing is first.

If it seems to idle fine, but stalls when you apply the throttle, the first thing I would do is apply the choke or enrichment. If this IMPROVES the engine's running, you probably still have crap blocking the air/fuel ports inside the carb. Another way past that is to put your hand over the intake/airbox as you are applying throttle. This will sort of force-feed the carb and make it pull more fuel.

The next thing I'd do is shoot carb cleaner around the carb mount/base. You might have a vacuum leak that you have not detected. If there is ANY change in the idle speed as you spray carb cleaner on the carb base, you've found your leak. Fix that, then retune the carb.

What you describe sounds completely fuel based to me, not ignition. Most single cylinder engines have almost no ignition "control" in them other than what signals it to fire. If you're getting ignition (which you are), then the electrical part should be fine..... unless..... there is some excessive electrical draw that the stator can not keep up with. assuming this is a kick/pull start engine..... if there is a charging circuit/elec start/battery, then it is certainly possible that the stator or voltage regulator is unable to supply the power needed to reliably fire the ignition. THAT could be a possibility.
 

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