Absolutely the cheapest way to gain HP from your stock CRF50. Almost doubles your Honda original horsepower without any major engine work or cost.

This 75cc big bore kit comes complete with 48mm steel cylinder and high performance piston, rings, seals and gaskets. Installs in less than one hour.

This kit is available for 12V and 6V engines.

Full kit and top end replacement kit available. See below.