Topic: Another kohler starting problem

[ef13]

This is for a grass cutter mower.Engine is a CV491S 17.5 command. Will not start! Pops out the carb and thats it. -Great compression. -has nice spark. -flywheel key is fine. -fuel pump is working. -Fuel solinoid is working.

Put a little gas in the carb and tryed starting it up and poped and had flames in the carb.

Seems like a timing problem, but nothing is out of the ordanary.

Pulled the valve cover off and there was oil in there, is that normal?

Any sugestions???

[ef13]

Any one???

[Squidd]

Leakdown test rather than compression test

[ef13]

can you explain how to do that?

[amcchevy1]

you opened the valve cover, did you look to see if the valves were opening and closing properly? that could be your problem.

[The Tank]

I agree with amcchevy sounds like your valves are out of adjustment but I've also seen spark plugs cause problems similiar to this also.

[pushtothepits]

When you take off the valve cover I bet a rocker arm will fall out in pieces. Dont keep trying to start it till you have inspected the valve train. Was just down this road a couple weeks ago

[ef13]

Yes, I did check the valves. everything was intact and the valves seemed to open and close just fine. I pulled the head off and I was going to pull the valves off and inspect them closer, Figured I will relap them also since it will be apart.

anything else to check?

[MowJoe]

Eric i was working on one today that would crank over but only backfire out the carb . I did the same as you checked the valves and pushrods I found mine had a sheared flywheel key Not something you see a lot on a Kohler but it was sheared. I replaced it and reassembled everything and it works fine now.

[ef13]

Yeah, that was one of my first checks and it was good.

[ef13]

pulled the valves and found a small piece of carbon on the ex valve seat. Would this give me the problem? waiting for the head gasket to come in so i can try it.