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2004 WR450F Jetting

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I just purchased a Pro Circuit Ti-4 exhaust system and the bike is making popping/crackling sounds so I assume that it is running lean. I plan to buy the JD jetting kit and was wondering where I should start in terms of jetting.

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.. and if you choose to run the kit, use the blue marked needle in the middle(#4) clip position with #168 - 170 main jet.

James

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