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Message: [QUOTE="Planehoun, post: 1426735, member: 123769"] Purchased a 1977 yz125. Engine needed a little work, but when I split the case I found that the transmission gears where shot. Instead of trying to hunt down parts for it, I was wondering if I could swap the engine out with a newer model without to much hassle. The frame and assorted parts are in excellent condition so I would really hate to scrap the bike. Any information would be great, thanks. [/QUOTE]