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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
'04 YZ450 jetting
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[QUOTE="biglou, post: 772830"] My suggestion for baseline to start from would be 40 pilot (42 is stock), back to middle (4th) position on the needle, and leave your main down one size. I'd also go to 1-1/4 out on the pilot screw. See how that performs and tweak from there using the pilot screw and, if necessary, the needle clip/pilot size. Other than that, a JD jetting kit (available through the ThumperTalk.com store) should take care of any inconsistancies when transitioning through the cab curcuits. Essentially, what you are buying is two custom tapered needles and the knowledge of how to use them correctly. Worth the money, IMO. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
'04 YZ450 jetting
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