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YZ80

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I know this is a 4stroke forum but i know people know things about jettings and all so i came here for some help. My brother has a 01 yz80 and something seems wrong and i think it would be jetting. Its been like this since he bought it i think but im not 100% sure. Well the bike when you start going seems to bog and then all the sudden kinda burst with power(for a 80haha). Its the least smooth bike ive ever ridden...it even kinda scares me to ride it. I think once it passes the bog and rev its fine but it doesnt start out smooth at all. Im thinking it could be too much gas getting to the engine and it makes it have trouble then once it gets going its fine...i dont know almost anything about jetting and carbs and all though. How could i fix it or is it just a thing 80s do? It has a stock pipe with a pro circuit silencer if that makes any difference.

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