Its old, a 73 cheetah with a 400 Kawa motor, but a 2 stroke is a 2 stroke, almost i guess. Problem is it wont run. It will start and run great for about a minute though! Then it dies, and usually will not restart. Sometimes it backfires and spits while trying to restart. It does not loose spark or fuel. I replaced the crank seals last year, and rebuilt the carb. I have low compression in one jug. 130psi is one and 85 psi in the other, but it was that way last year and ran great! not a problem! I dont know why it would run fine with a problem cylinder last year but not this year, or if it has anything to do with it?? Any ideas??