These springs sit as shock absorbers in the primary drive. They are used to protect the gearbox even with very high-torque engines. The stronger springs keep a residual spring travel even at high loads compared to standard springs. Load peaks are thus absorbed and not transferred to the transmission. Despite the harder springs, the gearbox is effectively protected, and the gearbox and all other drive components have a long service life to thank for it.
Diameter Ø11,20mm
length: 29,90mm
Wire thickness: Ø 2.00mm
Scope of delivery: 4 springs (set) suitable for a primary
Suitable: For all primary reduction Vespa Smallframe with jerk dampers ex works (all over 50cc)
CONCLUSION: Absolutely essential if it goes into the higher performance league ala M200. We recommend with such engines but directly a completely reinforced primary from BGM PRO, Fabbri, Benelli or Egig.
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