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I was wondering if my thumpstar that has a 150cc lifan fiited be able to have a zongshen 140cc fiited on it thanks .

I have a thumpstar 150cc lifan engine , having trouble with it can anybody help . starts fine , idles good , and when u start riding it starts jerking , it has a new spark plug , ive stripped the carbie down and cleaned it , its still doing the same thing , the carbie is a 26mm oko. thanks