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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Needle Jet
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[QUOTE="dirt bike dave, post: 132057, member: 18302"] The higher needle # is a fatter needle which will restrict more fuel, leaning out the bike. In your manual I think there is a list optional parts - go for the highest # on the needle. Have you filed your slide down or replaced witha KX250 slide? It is a common mod to remove 1mm from the bottom of the slide to lean out the low end and improve throttle response. You should also try a #38 slow speed jet as you are two turns out on the airscrew. What plug are you using? If you are using a B9ES, that is part of the problem. A hotter B8ES or even a B7ES works fine in that bike. Depending on your weather, you might also want to try a 158 main. Good luck getting it sorted out. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Needle Jet
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