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erikvilla
Guest
Hi I have a 80cc engine on a mountain bike. the engine works very good but when i am going top speed or close to top speed i hear a loud rattling sound coming from the engine.. when i first installed the engine i dont remember it making this noise. The motor seems to work just fine but i dont no what can be making this noise my other new 80cc engine on my cruiser bike doesnt make this noise at all. can any one help me out?