Interrupt hammer (MZA) - Simson S50, S51, SR50, KR51, SR4-2/3/4 Note: The spare part is suitable for SIMSON motorcycles. The interrupt hammer is designed for all Simson S50, S51, S70, SR50, KR51 / 1, KR51 / 2, SR4-2, SR4-3 and SR4-4 ignition systems. Can be used: Simson S51, S70, SR50, KR51/2 The product of the MZA, which is the exclusive holder of the SIMSON brand.