I have a machine in the shop right now with some problems. Dealer thought it might be a burnt valve or possibly a coil. It has the 22hp Kohler engine on it. I asked him roughly what the cost would be to get her running good again and he told me that if it were the coil, parts labor around 125.00.......burnt valve would be higher. My point is this...........aren't the coils warrantied for life? I've had them changed in that very machine by this same dealer before and it didn't cost a dime! Before I raise too much cain over this I needed to be sure if I was thinking correctly or did I just get a good break last time. Should be fixed tomorrow ( I hope ) so I'll check back for responses in the morning.