I bought my garden tractor in 96. 18.5 kolher engine. No real problem untin lately. When I try to start it, the starter turns but,sometimes, it doesnt sound like it is making contact with the flywheel..just spinning. I can trun the key on and off half a dozen times and it will begin to turn the flywheel a little, and then it will catch the flywheel solid and start. This only seems to happen when its cold. After it warms up, I dont seem to have a problem. Is there something that forces the drive gear on the starter to go up and down to contact the flywheel when you want to start it...or what?