hi there my fellow riders i just got my top end redone re nicklesild my cylinders to stock bore everything back to stock now the problem is im getting backfire through the exhaust on rear cylinder front seems fine to lean to rich air leak what do you guys think it is thanks for any help brent im so close to getting this baby on the road its killin me ahhhhhh
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ysr 50
90 mc21
91 mc21
and blata pocket rocket!
ride the moment!!