Seller notes

Camshafts change the "personality" of gas engines more than any other component in the combustion train.The HotCams 4055 is a strong midrange exhaust cam for the WR/YZ250F, and in this case is paired with an unusual 4155 "Builders" cam that was manufactured only for a short while by HotCams, with fully adjustable cam timing. This is a really big deal, and will allow you to experiment with different intake valve closings (more or less compression) and intake/exhaust overlap (shift flow up or down...

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