Question about 2004 Yamaha YZ 450 F
You have an air leak after the carburetor. Old, cracked rubber fittings between carb and cylinder will let air into the manifold causing a lean fuel/air mixture. Same is true of "O" rings and gaskets. If there is a leak in the head gasket that will lean the mix also. Fix the air leaks and you fix the problem.
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Posted on Jul 02, 2009
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Posted on Jan 02, 2017
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