Regina Auto 024-0424, 45-00161, C121-56 Timing Chain

The Regina Auto 024-0424, 45-00161, C121-56 Timing Chain is Regina's cam-drive timing chain, a member of the C121 family engineered for engine timing drives in motorcycles and small- to mid-size engines. According to Regina's general catalog, C121-series chains use a pitch of 15.875 mm (5/8 in), an inner width of about 9.53 mm, and a plate thickness near 1.6 mm, with a typical per-link length of 19.0 mm. The C121-56 variant can be produced as a bushing or roller chain for engine timing drives to withstand wear while maintaining precise synchronization when paired with the correct sprockets and timing marks. Use this part with engines that specify Regina C121-series timing chains and reference numbers 024-0424 and 45-00161 to ensure proper compatibility with the engine's timing gear train.