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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
"Bogging" 250 WR
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[QUOTE="Humai, post: 76284, member: 17287"] Rako, Yours is no doubt a Euro spec bike. Does it still have the stock one piece muffler fitted? I found with mine (also Euro spec) that in stock trim, it ran horribly rich until well into the mid to top end revs at which point it would clean up into a good top end rush. Removal of the airbox lid made the single biggest difference, making the bike actually "jettable" from that point. The Euro WR250F seems very sensitive to airbox capacity and flow dynamics. Leaning the needle two clip positions (from number 4 to number 2 position from top) cleaned up the partial throttle mixture and now it's pretty close, with just a leaner pilot required from stock to perfect it. Another thing to consider: the US versions of the WR250F seem to benefit from retarding the exhaust cam one tooth (so-called "YZ timing") as per the suggestions above. I have not seen evidence to suggest that the Euro and US versions use the same timing and would double check before attempting this. It may be possible that the Euros use the YZ timing already. - Grant [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
"Bogging" 250 WR
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