Give me a crash course on jetting?

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.

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

thanks that helps alot now i just need to figure out what needle to put in.

look in the faq's

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