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- Vespa Classic
- Clutch -KINGWELLE 4S-R DragBikeClutch- Vespa V50, V90, SS50, SS90, PV125, ET3, PK50, PK80, PK50 S, PK80 S, PK125 S, PK50 XL, PK125 XL, ETS, PK50 HP, PK50 SS
Made in Germany4-disc racing clutch for powerful Vespa smallframe engines with standard countershaft length.
The KINGWELLE 4S-R DragBikeClutch is a genuine racing clutch for Vespa smallframe engines, developed for drag racing and sprint use. This version is designed for standard-length auxiliary shafts and is aimed at engines where a conventional sports clutch no longer works reliably enough. The 4S-R is designed for powerful setups in the range of approx. 40-45 hp and approx. 30-35 Nm - depending on lining material, spring assembly, oil, housing and complete engine tuning.
The KINGWELLE clutch was developed from a clear problem in drag racing: very high engine power must be transmitted in a controllable manner at the start, even if the clutch is hot after several runs. The clutch was therefore developed using high-quality materials and with a focus on reproducible function. The 4-disc version is the right choice for powerful smallframe engines where high load capacity and good clutch engagement must be combined.
The 4S-R version is designed for tough everyday racing conditions. The R stands for the ring that secures the upper cover plate. This eliminates the need for screws at this point. This reduces the risk of screws coming loose or getting lost, especially when working on an open engine or during racing. At the same time, the clutch remains designed for high spring forces and powerful engines.
This version is designed for smallframe engines with a standard length auxiliary shaft. For engines with an extended auxiliary shaft, e.g. DRT, Faio or comparable racing auxiliary shafts, the corresponding 4S-R version for long auxiliary shafts is required.
KINGWELLE recommends the 4S-R for engines up to approx. 40-45 hp and approx. 30-35 Nm. It is therefore positioned well above classic sports clutches and is suitable for ambitious road engines, sprint setups and racing engines where controlled engagement and high load capacity are crucial.
Depending on the housing, secondary shaft length and installation situation, a 1 mm spacer kit may be required. This applies to the cover, brake drum, main shaft bearing and brake anchor plate. The free movement of the clutch and complete disengagement must be checked carefully before final assembly.
The KINGWELLE clutch can be adjusted with different linings and spring strengths depending on the engine power and intended use. Cork linings offer good grip and are attractively priced. Carbon linings are more heat-resistant, but usually require a little more spring tension.
This product is a tuning and racing part for high-performance engines. Installation and operation significantly affect the durability and load of the entire engine. Damage to the engine, vehicle or third parties is possible in the event of improper installation. Installation, tuning and operation are the responsibility of the user and should only be carried out with the appropriate expertise.
| 4-disc | for auxiliary shaft with standard length |
|---|---|
| 4-discs | for extended auxiliary shaft, e.g. DRT, Faio etc. |
| 5-discs | for extended auxiliary shaft, e.g. DRT, Faio etc. |
| Manufacturer: KINGWELLE | KINGWELLE |
|---|---|
| Model | 4S-R DragBikeClutch |
| Type | 4-disc racing clutch |
| Auxiliary shaft | Standard length |
| Power range | approx. 40-45 hp / 30-35 Nm, depending on setup |
| Spring type | PK XL2 spring type |
| Release | Release bearing with needle bearings |
| Oil recommendation | Motul 7100 10W40 |
| Oil quantity | approx. 400 ml standard case, up to approx. 600 ml Quattrini case |
The KINGWELLE 4S-R DragBikeClutch for standard side shaft is the right racing clutch for powerful smallframe engines up to approx. 40-45 hp. It combines high load capacity with controllable clutch engagement and is therefore a consistent solution for sprint, drag and racetrack engines with a normal secondary shaft length.
