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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
2016 YZ250 Jetting, NEED EXPERT JETTING ADVICE
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[QUOTE="jaguar, post: 1470985, member: 19340"] To be safe just put a fatter main jet in it and if its runs irregularly then you know its too fat. Too lean would be a noticeable loss of power. So buy 5 jets and do that. When by feel you think you have the right size jet in there then ride it hard for 30 minutes and then pull the plug out and see what color it is. Darker than a medium brown indicates too rich and lighter indicates too lean. Unfortunately the needle position also has a small but significant influence on maximum gas flow so all along testing you may also be raising or lowering the needle so it runs good at mid throttle. Be sure to check out my post in mods & maintenance about fuel/oil and jetting. [/QUOTE]
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Forums
MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
2016 YZ250 Jetting, NEED EXPERT JETTING ADVICE
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