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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
WR jetting after YZ timing
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[QUOTE="Jonny426, post: 627469, member: 22962"] Just for the fun of it, take your valve cover off and re-inspect the cam timing. Sometimes the intake cam slips a tooth while you set up the ex. cam. Everything looks cool until you release the tensioner and recheck TDC/cam timing marks. I have used the OBELN in my 426 and a friend's WR450-great midpower. I run stock pilot jet ,pilot air jet,main air jets,but up10to15 on the main jet. When i tried larger pilot jets my bike needed the hot start every time warm, and idled very rich no matter where the screw was set. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
WR jetting after YZ timing
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