Engine was spitting, sputtering and quitting occasionally-cleaned gas tank and carburetor..thought I had it fixed but did it again after about 30 minutes running. I pushed it under the shed. Now it turns over find but will not even hit. Grounded plug against the head and turned engine over-spark looks yellow. Compression 100 after a few revolutions--Model CV12.59--what about a resistor or coil or ignition module that has gone bad...Bought this Cub Cadet in 91 or 92 and the cover has never been off of it..I have tinkered with small engines all my life but not much on Kohlers...Any help will be appreciated..Thanks