Question about Kohler CH25 PA-CH730-0040 Command Gasoline Engine

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Kohler CH20S losing power, blowing black smoke and oil

I have a 2004/05 ch20S v twin Kohler horizontal engine that powers a Timberking sawmill with 300+ hours. Operates at 8,000 ft elevation. Started having problems with Black smoke/carboning up plugs etc after first 100 hrs, Got so bad wouldnt start. Took to Kohler repair shop, diagnosed as having cracked carburator. Had new carb, high alt. jets, and top mounted deicing/heater kit installed. After 30 hours engine starts and idles fine but when at full throttle and cutting engine will lose power, blow thick black smoke acts as if it will stall for 5-10 seconds will then return to normal for 5 seconds and repeat the above. This occurs at above 40 or below 40 degrees without/with deicng kit on. small amounts of oil are lblowing/eaking from left cylinder into muffler. I only use fresh exxon premium gas with 2 year stabil added.

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Sounds like engine is flodding. Have carb float checked, make sure it is at the correct height

Posted on Feb 04, 2010

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