longjia has no power why?

Hi,

If this bike is a 2 stroke (as I suspect) then you need to ensure the exhaust is clean (internally) and also that your plug is in good condition.
Remove the exhaust baffle and clean in caustic soda or oven cleaner. If the baffle is excessively dirty it can indicate over oiling from the oil pump or a rich mixture. You may also have to remove the exhaust and run cleaning solution down the whole system if it is very dirty.
A 2 stroke needs to breath and the exhaust is a critical part of the system.

westcountry
October 2013