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WR450,YZ450 power differences

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Can anyone tell me what the component differences are between a WR450f and a YZ450 i know that the WR has about 53 bhp and the YZ about 60 bhp but what parts make up the difference in power, any help would be grateful.:cry:

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I think your a little high on your stock hp guess.. anyway cams-timing-ignition-revbox-jetting. lots of small things,if you do the work your self my guess would be 500.00 to 700.00, maybe less.. Elect. starts are NICE!!need a better pipe also..have fun:thumbsup:

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