I picked up a Factory Pro Jet Kit from www.factorypro.com
They are a little pricey but WELL WORTH IT! My buddy highly recommended them and I do too now.
Im not sure about all kits, but on my YFZ450 it was a little more thana simple jet kit. I had to drill my factory MAJ and add another MAJ (Main Air Jet). It was incredible and comes with everything you need. It uses the same jet sizes as the GYTR kit however you dont need as large of jets because of the MAJ modification.
INCREDIBLE KIT! HIGHLY RECOMMENDED!
Quad Jet Kits FACTORY PRO!
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