wierd moped again

i dont know the problem with this moped but every time i go full throttle it sounds like the piston is hitting something or it just makes a really weird noise like something is hitting something dont know what the problem is but i just got it bak from the shop and its making this problem alreayd someone help please!!!

Re: wierd moped again

Possibly the Crankshaft has worn and your piston is tapping your Sparkplug. only a guess but it happens.

Re: wierd moped again

John Ayers /

o god if its that then thats horrible

Re: wierd moped again

John Ayers /

also how would you fix that?

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