CDHpower 2 Stroke Gas Bicycle Engine kit YD100-CDH50mm 79CC/80CC Engine Kit; Bore and Stroke: 50mm x 40mm; no CDH sticker on motor; Better adjusting clutch a little before riding. CDHpower 2 Stroke Gas Bicycle Engine kit YD100-CDH 79CC/80CC Engine Kit; Bore and Stroke: 50mm x 40mm.
