Kohler CV22S cutting out

[Barry In Indiana]

Hello all. I have posted with this problem before but here"s an update. I have a 22 HP Kohler Command CV22s on a Dixie Chopper. I purchased it from Small Engine Warehouse in 2004 to replace the CV22 that was burning oil. I can mow for 15 to 30 minutes and the engine runs fine then it will begin to backfire and cut out and lose power. If I don't stop and shut off the blades it will die but starts right back up. When it does this the throttle has very little effect on the speed of the engine. I can move the throttle all the way to idle and let it run for a few minutes and it stops backfiring and runs pretty smooth. If I run it around 2700 RPM it will continue to run and mow but at that RPM its not mowing very well. It should run around 3500 rpm. The idle adjustment on the carb has very little effect. It slows down a little when it's all the way in. I have it set about 1 turn out. Now here's what I've done so far. The old motor ran well but was burning oil so I have used it for parts. I changed carbs no difference, I have changed both coils, no difference. I have changed fuel pumps, no difference. I've put in new plugs, no difference. Today I put all new fuel line and filter on, no difference. Both plugs are firing well. Believe me I pulled the wires from each while it was running and it has spark. It acts as if it starves for gas. When I hit heavy grass and the governor speeds it up that"s when it will begin to cut out and backfire and then it seems it won't recover and it will die. Anybody have any ideas?

Barry in Indiana

 

[G. L. Perry]

Setting the valves? When hot, they expand, no clearance and backfires and coughs. Set them hot!

 

[lucas boy]

have you adjusted the air fuel mix on the carb?

 

[lucas boy]

just remembered , have seen a few do this when not useing 10w30 oil . the thicker oil can hold the valves open.no valve adjustment on these,they usee hydro lifters.

 

[Kentb of SWMO]

You can not adjust the fuel mix as the carb has a fixed jet. Also the valve lifters are hydraulic. Not need to adjust valves. With it running OK at the lower RPM I would look to a fuel delivery problem at the higher engine speed.

Kent

 

[Barry In Indiana]

Thanks for the replies. I have been using 10W30 oil in it. I have also run a tank of premium high octane fuel thru it. I have also put some marvel mystery oil in the gas in case a valve might be sticking. After I posted last night I got to wondering about timing. If the SAM module was bad could it affect it in such a way. I was going to swap it but it looks like a real job since all of the wiring comes out of it.

Barry in Indiana