... chain with heat treatment 3.materail:40mn High quality 420,428,428H,415,415H,520,530 motorcycle chain Our ... :Specializing in manufacturing and supplying motorcycle engine and motorcycle engine parts, such as motorcycle cylinder kits, piston kits, crankshaft, ... timing chain, valve, carburetor , lights series, other motorcycle parts and so on to motorcycle manufacture, wholesale, distributor and trade ...