I just found this Wheel Horse web site yesterday, and it is like I hit the jackpot. It's easy to get lost for a few hours on this web site.
I've been browsing the engine forum for a couple of hours this evening, hoping to find someone else who has had an engine problem similar to that which I am having.
I have a 1974 C-100 with the K241 10HP engine. Beginning last season the engine developed an interesting problem. After running for approximately 10-15 minutes, the engine would begin what I can best describe as "fluttering" and losing power. Eventually it would simply stop running. After I let the tractor set for a few minutes, I could restart the engine and it would run fine for a few minutes and then go through the same process.
At first I believed the problem to be an ignition problem, so I began changing different ignition components - spark plug, spark plug wire, points, condensor, and coil. I used all Kohler components. The problem continues and has not gotten any better.
So now, after reading your postings, I'm thinking that the issue may be caused by carbon build up. But I'm also wondering if the engine just may need a valve job or new valves.
If time permits, I plan on pulling the head this weekend and doing a thorough cleaning.
I'm not a mechanic by trade so I'd like to get the input from those of you who have way more knowledge and experience with these Kohlers than I have.
Thanks for any suggestions you might have.