Timing chain is used in motorcycle engines to transmit the rotation of the crankshaft to the camshaft and maintain the proper opening and closing timing of the intake and exhaust valves of the engine (also called a cam chain).
                    In motorcycle engines, 6.35mm pitch silent chains 
and bush chains are generally adopted as timing chains. DID timing 
chains have excellent wear resistance, fatigue strength, quietness, and 
impact toughness. Therefore, it is also used in motorcycle high-speed 
range engines both in Japan and overseas.