The clutch of the Vespa PK50 XL FL/HP/XL2/PK125 N/XL2 is to small frame motors as the COSA clutch is to large frame /PX motors. Everybody not blessed with a vice-like grip will appreciate the light action of this clutch.
The power of the PK XL2 clutch is distributed by six hexagonally arranged springs. When reinforced springs are used, due to tuning, the light-action of the clutch lever is retained. Clean separation between the plates is also improved even at tick-over revolution speeds.
The Standard Clutch has 3 cork-material friction plates and is ideal for non-tuned motors. The Sport Version has 4 cork-material friction plates and 6 reinforced springs and a good choice for mildly tuned motors, including only kitted motors and also kit and expansion chamber combinations. The 4 carbon fibre friction plates of the Race Version have even more grip and are especially suited to highly tuned and/or race motors.
The clutch fits all Vespa 50-125/PV/ET3/PKK-50-125/5/XL motors. The thrust plate from the PKXL2 motor is also necessary and some motors also require the clutch cover to be modified, or the purchase of the SIP small frame custom clutch cover.
Conclusion: The clutch technology of the PK motor range is compatible with the older small frame motors, enabling modern tuning power!
SIP-TIP: A new woodruff key, clutch nut and locking washers are a must, reinforced springs and friction plates also recommended for tuned motors. Do not forget gearbox oil (SAE30 or even SAE80W90 for the carbon-fibre friction plates) for an overnight soak before assembly!
SIP community user ‚klose‘ (on part no. 93492000): “Must be recommended for all tuning cylinder setups”