I have the opportunity to get ahold of a 1986 125m for a reasonable price.. plastic looks good and so does the tank. Its missing the pull starter, chain, chain cover, and shifter from what I can see in the pics. Also looks like the case cover has a small hole in it maybe from chain coming off. I know the 86/87 125's are hard to come by for parts, but are the drivetrain parts interchangeable in all years?