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Canadian Daves JustKDX
1999 kdx stumbles at lower revs?
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[QUOTE="dirt bike dave, post: 1426787, member: 18302"] Personally, I would focus on the low speed jetting and leave the main alone for now. Jeff Fredette says 45 or 48 on the pilot. He's in Illinois, low elevation. If you are at elevation, I'd order a 45 and a 42 and play around with them. [url]http://www.frpoffroad.com/aboutus.htm[/url] His article does not mention the needle, but a fatter needle (blocks more of the jet so the bike runs leaner) might also help. Go 2.5 turns out with your 48 pilot in there, and see if it runs better than it does at 1.5 turns out. If so, put in a 45. Keep in mind weather and elevation make a difference, too. Hot, humid weather, low barometric pressure or high elevation = less oxygen to burn, so optimum jetting would be leaner than what you might run in winter. Besides making sure the float level is correct, there are a few other things to rule out. For example, an over-oiled air filter will also cause a bike to run too rich. Never had a '99, but every KDX I've ever had (3 of them) was jetted way too rich for my riding conditions (4,000 - 9,000 feet). The 250 was the worst - it needed a hotter plug, new slide, needle, pilot and main to get the most out of it. I had a 38 pilot in that one. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
1999 kdx stumbles at lower revs?
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