Parts built
to keep up.

As RPM rises, centrifugal force pushes the clutch arms outward, pressing them against the clutch bell, which is connected to the rear wheel via the primary gears and chain. Springs counteract that centrifugal force so the clutch engages smoothly instead of abruptly – full engine power only reaches the rear wheel once RPM is high enough.

The forces on the clutch don't rise linearly with RPM. Just 10 % more RPM can mean 20 % more force on the clutch shoes. On heavily tuned engines running well past 10,000 RPM, that's enough to bend or break stock parts – lighter ASP shoes noticeably reduce these forces.

Straight-cut sets produce zero side load, making them the first choice for sprint and race use at very high power. Helical sets run much quieter and, at over 90 % efficiency, transmit almost as much power – ideal for regular daily use with some extra power in reserve.

The adjustment screw on each spring lets you delay the engagement point – screwing it in further delays engagement to a higher RPM. If the screw sits more than about 2 mm below the surface and you still haven't reached the RPM you want, it's time for stronger springs. A later engagement point suits engines that don't make much power at low RPM.

For every Puch Maxi E50 rider: from the original daily-driver engine that simply needs a good-quality replacement clutch, all the way to a fully tuned race setup revving past 12,000 RPM. We're happy to help you find the right combination for your engine.