kohler command 25 hp

[PAQ]

I have an Allmand loader backhoe that is powered by a Kohler command 25 hp engine.
It starts well, seems to have good power and it saves my back on at least a daily bases. The problem is that when it is hot and you shut it off for a short time and restart it, it will run on one cylinder for a while. Sometimes it picks up the second cylinder suddenly and sometime gradually. The book doesn’t give me a clue as to the problem. Sometimes it pops on shutdown which makes me think exhaust valve but compression seems good. I replaced the plugs and air filter.

So any suggestions?
Thank you in advance
 

[Kentb of SWMO]

Try checking the fire on the cylinder that is missing with a inductive timing light. If you have intermittent fire, I would replace the coil for that cylinder as it may have developed a heat problem. You could also swap the coil to see if the miss moves. One of the coil could be failing because of heat.
I had this same thing happen on a 22 HP Command engine. I thought the engine was tried as it was on a zero turn mower the local school used that had POOR air filter maintenance. I install a new engine. Later after seeing the inside a a single cylinder command engine that had eaten WAY more dirt that the v-twin had I took the V-twin apart. I could find NOTHING wrong with it. Later because of some operator errors, this engine was put back on the mower it came from. It seems to be running well. I do not know WHAT made it run poorly in it's earlier life.

Kent
 

[PAQ]

Thanks kent.
I will try that this weekend. It does seem like the kind of thing a weak electrical component would do.
PAQ