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  1. New to the form have question about upgrading exhaust.

    YFZ450 & YFZ450R General talk
    Hello, I am new to the atv world. I just bought a 05 yfz 450 special addition. I am ordering a full exhaust. As of right now I bought it with a slip on that doesn't fit it, the owner did a really shitty welding job. What do I need to do with re-valving the carb????