Spun timing chain

Hey guys, I'm new to this forum and really hoping someone can help me out. I have a icebear maddog 50cc and just installed a BBK to make it "100cc". I put everything back together it all lined up and seem to go together great. However when I tried to start it it would turn over once maybe twice before the flywheel or timing chain would get stuck. I took it back apart and everything still looked ok until I noticed the cam was way off. It had been thrown almost 180 deg from TDC. I reset TDC and the chain everything seemed ok but again throws the chain. If anyone could please give me some advice I would really appreciate it

Re: Spun timing chain

You have a modern Chinese scooter, this is a vintage moped forum. You'd have better luck on a modern Chinese scooter forum

Re: Spun timing chain

Did you tension the chain after timing the cam?

Sounds like a loose chain. There's a tensioner up top underneath a little screwed on plate usually, right above the chain galley.

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