I think the piston that it originally came with has been totaly and permanantly discontinued. It had 1.5mm rings, and the pin-locater was in the middle of the groove. The "replacement" has 2mm rings and the pin on the edge of the groove, like most other mopeds. I got the replacement from handy bikes, and even sent in the original one to match it up. I guess that I'll have to give them a call, and Talk to sombody who should know what to do. I'm just glad I didn't just jump in and do it. It would suck to be out the money, but damn I want to ride again.
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