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Eliminates the 9800 rpm rev limiter and provides a hotter advance curve. For use on Honda CRF110F 13-18 and CRF150F 06-17.
If you have a '03-'05 CRF150F or a '03-Present CRF230F, use 451-HCF-1501 instead. This Rev Box does not fit the 2019 and newer EFI model CRF110F.