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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Loss of top end 99 220
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[QUOTE="GabeM, post: 1175528, member: 30230"] I just replaced the piston on my son's 99 220 and cleaned the powervalve and now the top end is gone. We bought him an FMF Knarly woods pipe and powercore-II silencer and re-jetted at Christmas time. the bike really came alive on top. easy wheelies in 3rd and 4th gear. But now that he was reving the bike a lot more I decided to replace the stock piston with a wiseco. I took apart the power valve (which I had done before on my old 200) and cleaned it, there was very little carbon on the exhaust slide, and the valve was operating smothly before. After re-assembly, the valve worked great manually and you could see it turn thru the side inspection cover. But now he has no top end. I checked the jets to make sure there was nothing clogging them, and the main shaft still turns when you rev the bike up. Could one of the side valves have broke just below the gear? I re-assembled them correctly paying special attention to the notches and detents on the shafts and the gears. Like I said, I've done this on my other bike and it's no big deal to do it. Thanks Gabe [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Loss of top end 99 220
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