29cc Chung Yang CY29RC Goped or RC Car Engine. This is a high-performance powerhouse with a 35mm piston bore and 30mm stroke. Walbro WT-668 carburetor used. Available in black or chrome with optional inner clutch. For Spindle drive it bolts to the end of the crankshaft without clutch half. To work on Spindle drive with clutch must also use 54mm Drum Side of Clutch, sold separately. Also called R290.3.5 HP. Recommended 91 octane or higher, 25:1. Mounts just like Zenoah G23LH, G230RC, G260RC, R290 and GPL290. Fits; Sport (Stock Muffler may need to be dented in on Sport), Liquimatic, Bigfoot, X-ped, Super X-ped, Super Bigfoot, Go-Quad, GSR26R, GSR29R, Cruiser Fits many Applications and certain RC Helicopters, Airplanes and Boats.