S2 Ep. 7: Rebuilding the Cylinder Head, New Valves and Springs

Reassembly of the Yamaha SVHO continues.

cylinder head
Pro Circuit Releases New 2019 KX450 Camshafts, Valve Springs

Pro Circuit camshafts and valve springs are two new items available for the 2019 KX450 that provide superior performance over stock.

2017 CRF450R/RX Performance Engine Package

Pro Circuit has introduced a Performance Engine Package for the new 2017 Honda CRF450R/RX. This all new package consists of a high-compression piston kit, camshaft and valve springs.