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I have seen people change out their main jet to #62 on a stock motor. My friend has a stock motor, UNI air filter, BBR Pipe. The pipe came with a #62 Jet. It seems like it lost power/performance after changing the jet. What should be done, lean/rich? Lastly, should changing the jet improve the perfomance on a stock motor/carb?
 

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hm

u know, i have a stock 50 with only a D&D pipe, K&N, CDI and sometype of vent tube (i have no i dea whats it for, but it was 20.00 bucks so i got it)..... and i jet mine to a #60 and it runs great...



But my friend has one with a Two bros pipe, K&N, vent tube (thingy) and he jt his with a #60 also and it runs like shit.... and sometimes it wont stay on, and when it was stock #58 it back fired like crazy..... So we are still trying to figure that out why.
 
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