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I own a 2006 yzf 450. I was wandering if anyone knew why i have no top end. strong bottom end. Timing been done. jetted right.
 

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What kind of mods are on it. Sproket could be the problem. Lots of pipes are tuned for low end grunt instead of high end power and that could make a big difference. Cams would be the same way. Just all in the tunning if it's not stock.
 

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are you tlakin bout yfz quad or yzf bike....on a yfz quad as long as you have 20" tires you should still have top end with any pipe...check the clutch plates
 
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