400ex header vs stock manifold differences
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If you want a little more get a uni air filter and crack the air box lid. Then start to rejet. Jetting is required and a PIA. Its all trial and error. There are many variables like temp and elevation. I would start with a 160 and try it from there. BTW buy keihin jets, same brand as the carb.
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juanmortiz92
Yamaha
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07-21-2015 04:10 PM
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