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383firebird

yz444 kit flat on topend

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installed 444 kit with 13.5 comp piston. went to dunes this weekend now bike feels flat on topend! plenty of low end! bike has hot cams ,jetted,k+n filter, factory pipe with pmb cap. anyone had this issue with big bore kits dropping power on top? wondering if head or pipe is not flowing enough for the increased cc's?

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