Reinforced spring for the starter clutch, compatible with your moped equipped with a Sachs 504 or 505 engine.
Among other models, this helical spring is compatible with Hercules Prima M, 2, 3, 4, 5, Optima, and MX1 models.
The clutch spring is installed in the original flyweight (Pony part number A4348). Compared to the standard spring, this one is 15% stronger. Due to its stiffer design, the engagement point shifts to a higher RPM range. This makes the spring particularly suitable for tuning performance-enhanced engines.
| Spring design | Tension spring |
| Ø wire | 1 mm |
| Material | Spring steel |
| Ø outside | 4.75 mm |
| Total length | 110 mm |
| Sachs | 504 (without pedal shaft) 505 (with pedal shaft) - 1A (AT) , 2A (HG) , 2B (HG) |
| Hercules | Great - 2 , 3 , 4 , 5 , Optima MX 1 |
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