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Give me a crash course on jetting?

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Hye i know jetting has been beat to death but can any one give me a crash course on what the jets do and how it all works. i have a 03 wr450 with air box gutted, yz exhaust and i need to jet it but really dont know how it all works. I live in nh if that helps. any help would be appreciated. thanks alot guys.

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watch this. Not the same bike but it will take some of the mystery out of it for you.

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