
The PROX steel intake valve conversion kit for Honda CRF450R offers a robust solution for demanding motocross riders. Designed by PROX to replace the original valves, this steel kit is intended for PE05 machines (2014‑2016) and is built to withstand the repeated stresses of off-road training and racing. It is ideal for those seeking a reliable replacement part during a cylinder head overhaul or thorough engine maintenance.
This kit is aimed at experienced amateur mechanics and workshops: installation and seat checking, valve clearance adjustment, and timing verification are essential to ensure optimal performance. When installing, follow the manufacturer's recommendations and use the appropriate tools (press, fitting tool, feeler gauge). For riders pushing their CRF to the limit, the steel conversion is a common option to prioritize durability in muddy or abrasive conditions.
Before ordering, check compatibility with your engine year and version. If in doubt, entrust the installation to a professional for precise adjustment and proper valve seating.