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What is the complete model number off this genset? Please get back to me with this information and I will try to help you sort this out.
Do you have a copy of the Service Manual or not?
Did you check the valve clearance? Valves that are too tight can do this.
I am adding a link to the Kohler Service Manual which covers this set. Print this out so you have it. See the trouble shooting section. Be sure that the fuel in the system is fresh and has some additive in there like Stabil. Today's gas goes bad very quickly. Check the obvious things first, like the timing and filters and valve lash. The carb may need a good cleaning. Use lacquer thinner and some compressed air to blow out the jets and orifices. Please get backl to me if you need more. All follow ups are included in our fee.
Sorry about that...........forgot to hit the button!
If you look at the cover it is for quite a few different sets. The major differences are just in the ouput in watts or whether the genset is putting out 120 or 240 on the voltage. The engine trouble shooting is about the same on most of these.
If you go to this site that I have added a link for they can supply you with one for just this set that may be more complete. http://www.smokstak.com/forum/showthread.php?t=103534&page=2
Just checking back in to see if you were able to resolve this issue or do you still need some additional input from me here?
O.K........get back to me when you are ready.