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

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I have a Model # CH25S, SPEC # 68501 and SERIAL # 3222612881. It is sitting inside of a boat in south Louisiana, we call them mudboats. The engine is at 18 degree pitch. Specs say I can operate this engine with a 25 degree pitch or less. I just purchased this boat. I have no idea of the engine's past. I went through the carb and cleaned parts, and set the float to manufacture's specs. (22mm measured from the float bottom to the air horn casting) When I try to start the engine, the carb sneezes, a lot of black smoke comes from the exhaust and an occasional back fire and fuel shooting out of the top of the carb. I however did get it started twice, but had to keep it at full throttle to run. I'm not sure what to check next. Im thinking because of the pitch of the engine, the floats have to be adjusted, if so, how much?? If not the floats, can you please give me a little insight on what to door look for next. It's definitly getting too much fuel. Oh, it's a keihin carb with the number 22 stamped on the inside by the choke flap. It's a very simple single barrel carb.

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6ya6ya
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Posted on Jan 02, 2017

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mamicheddy
  • 79 Answers

SOURCE: kohler motor starts then carb loads up with gas

If the engine is running rough then this could mean that you have weak spark or valve adjustment. When an engine runs rough it will not burn all the fuel, which will create excess fuel in the air cleaner housing. Also, make sure the the float is closing in the carberator.

Posted on May 07, 2009

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SOURCE: kohler k582 runs poorly at operating speed.

ALWAYS CHECK THE POINTS!!! 20 years operating this engine and you'd think I would know better. The points were severely pitted. Spec said .020 but actual is .013. The cold weather had me suspecting a carb problem. DOH!

Posted on Jan 14, 2010

rowdy45176
  • 2176 Answers

SOURCE: I have a Kohler RV

it sounds like that, I would look at the needle valve to make sure opening. What I would do is remove the bowl and let gas flow thru it, then push up on the float valve and release to see if you get another stream of gas. What you can try also because I think there is gum(from stale gas) is running with the choke partially on till it starts to flood out and the open choke and see if continues to run. I don't know how extensive you mean when you say "cleaned" the carb but you might have to again with a good carb cleaner or find a soak for it.

Posted on Jun 26, 2011

SOURCE: I have a Kohler generator

Check the genset controller for a fault, low oil psi, no output voltage, overspeed, overcrank / no crank disconnect signal / starter staying engaged, high engine temp.

Posted on Jul 04, 2011

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