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engine numbers would say 636 in there...i went through this when i tried to sell my rr as a 636, not because im a jew but bc i didn't know any better...couple guys like loogie told me to check the numbers ant it was like yours...they said it should say 636 if otherwise.
Posts: 475
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dont even worry about it. my buddy has one and it pulls great, uses a 54tooth for in the lot. sick bike!
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my zx6rr pulled like a beast with a 60tooth, and yes it was a racemodel and fast as fuck.