Looking to seriously upgrade your Honda CRF50, XR50, CRF70, or similar mini dirt bike? This 140cc 4-stroke racing engine kit is a big jump in power. It's a complete horizontal single-cylinder motor with a 4-speed manual clutch (gears: 1-N-2-3-4). The kit comes with everything you need to swap it in: the engine itself, a carburetor, a CDI ignition box, a kick start lever, and a gear shift lever. Specs: 55mm bore x 59mm stroke, around 8kW (about 10.7 hp) max power at 7500 RPM, and 9.5 Nm of torque. It's air-cooled and runs on 92 octane gas. Important: This is an aftermarket engine designed to fit a range of older Honda mini bikes (like the Z50, CT70, etc.), but it's not a guaranteed plug-and-play for every single model. You should definitely check with a local dealer or mechanic to confirm it'll work with your specific bike frame and wiring. A great way to turn your little pit bike into a rocket.
