1.Different specifications of piston ring could be supplied. 2.Competitive price and good quality. ... & Sprocket: front hub, rear hub, hub cover, kick sprocket, oil pump sprocket, sprocket sitting,timing chain, driving gear, magnetor,etc.5 ... coil, shassis coil, rectifier, switch key,relay6. Engine: cylinder, piston kit, piston ring, clutch kit, clutch disk&plate, clutch fiber, clutch housing ...