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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Kx250f No idle,lots of backfire.
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[QUOTE="whenfoxforks-ruled, post: 1407363, member: 73147"] Take your fuel mixture screw out of the carburetor, verify that all the parts are in there. An 04, replace the o ring on the mixture screw, and the float valve and seat. Then try jetting it. Start with the ap circuit and get the squirt dialed in. Then move on to the basic routine, pilot, needle then the main jet. Having JD jetting send you an assortment of parts is always a good idea. No idle and back fire? Does this bike have 2 timing chains? What is the chances 1 is 1 tooth off? Check it 3 times. The crank thrust washer clearances and the condition of the stator are good/with in spec? You are checking the back fire with all the parts on, like the air filter and seat? Vintage Bob [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Kx250f No idle,lots of backfire.
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