Internal rotor electronic ignition from HPI in top quality, suitable for Hercules Prima 2, 3, 4, 5, Prima GT and GX, KTM Bora, and other models with Sachs 504/1, 505/2, 506/3B engines. Taper: 16mm x 11.5mm. The lightweight internal rotor (200g) saves power that would otherwise be consumed by the heavy flywheel. Includes installation instructions in English. Pure racing ignition, does not generate power for lights. Successfully used in 8-hour road races, 4-hour moped cross races, and various classic races. Low maintenance, strong ignition spark due to strong magnet. Base plate mounting diameter approx. 94mm. Tuning part, not approved for road use under STVZO, operating permit expires. Modifications required, buyer responsible. Returns only if undamaged and original. Check and adjust timing, ignition, and carburetor settings. No warranty on tuning parts.







