Puch 70cc Kstar kit problem

mmmbimmer /
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Been working on getting this kit to work for a few weeks. Now I finally have spark and all but got a few loud backfires. Took the intake off and notice the piston isnt coming back far enough to suck air/fuel mix. Not even coming back far enough to see the intake holes on the piston!? Only thing I could think of was hte cyldiner was the wrong way except the exhaust adn intake are 2 different spaced holes. I have a 1986 maxi. Only thing I could think of is a spacer between case and cylinder. Any thing I'm missing?

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