Ok fellas I found a YZ 400 that runs and comes with the ignition system for 200 bucks. Its a mid 80's or early 80's so its still air cooled. The guy im getting it from says that the case is the same size or really close to the same size as a yz 250 motor so it should swap in fairly easy. Anyone have any info on these motors or any input? Thank you all for looking.