Extremely durable—even for very powerful engines
The Stingworks Sei Giorni GP is a heavy-duty clutch for Vespa large-frame engines. Its design is suitable for everything from stock engines to very high-performance touring and racing setups.
The reinforced hub features significantly more material in the critical area around the crescent-shaped groove. At the same time, the 12 tabs on the friction plates distribute torque over a wide area within the clutch basket. This reduces localized stress and counteracts the typical buckling of the basket sides.
High power transmission with low hand force
The modern 6-disc lining package offers a particularly large effective friction surface. As a result, comparatively low spring forces are sufficient to reliably transmit even high engine torque.
With the included 8 BGM PRO XL springs, the clutch remains smooth and easy to modulate—a true two-finger clutch. At the same time, it accommodates setups with over 30 PS or more than 25 Nm.
Plug-and-play on the engine and freely adjustable
Installation requires no modification to the engine case or stock clutch cover. The set is supplied for self-installation and intentionally does not include a clutch pinion.
For proper assembly, the supplied retaining ring for the clutch basket should be shortened by about 5 mm before installation. This minor adjustment can be easily made with side-cutting pliers. Afterward, check that the retaining ring sits completely and without tension in its groove.
Standard Cosa2-type clutch pinions are used. The number of teeth and tooth profile must match the existing primary sprocket. This allows the gear ratio to be specifically tailored to engine power, transmission, tire size, and intended use.
Original Stingworks
Made in Germany
Plug & Play on the engine
Two-Finger Clutch
6 friction plates
Over 30 PS / 25 Nm
No clutch pinion
Shorten the retaining ring by approx. 5 mm
Important Installation Note Regarding the Retaining Ring
The retaining ring for the clutch basket included in the set should be shortened by about 5 mm before installation to ensure proper fit.
Shorten the retaining ring by approx. 5 mm before installation
You can easily trim it with a side-cutting plier
Then insert the ring neatly into the designated groove
Check for a secure fit around the entire circumference
The retaining ring must not be tilted or jammed outside the groove
This adjustment applies exclusively to the retaining ring. No machining of the motor housing or the clutch cover is required.
Key Benefits
Original Stingworks: developed and manufactured in Germany
Extremely durable: for stock and high-performance engines
Plug-and-play installation on the engine: no modification of the engine case or clutch cover required
Two-Finger Clutch: low operating force despite high torque capacity
Reinforced hub: more material around the crescent-shaped groove
12 friction plates: wide-area power transmission and reduced load on the clutch basket
Free gear ratio selection: can be combined with compatible Cosa2 clutch pinions
Easy ring adjustment: The retaining ring can be shortened with side cutters
Original Stingworks quality
The Sei Giorni GP is developed and manufactured in Germany. The precision-engineered clutch basket, reinforced hub, and modern BGM PRO friction plate package form a robust unit for reliable street, touring, and racing engines.
The 12 tabs on each friction disc distribute the forces across more contact surfaces than conventional friction plates. As a result, the clutch basket flanks are subjected to less localized stress and maintain their dimensions longer, even under high torque.
Technical Specifications
| Version |
Installation kit for self-installation |
| Friction Discs |
6 pieces featuring modern KTM friction technology |
| Lining tabs |
12 per friction disc |
| Springs |
8x BGM PRO XL, 6.5 N/mm |
| Load capacity |
Over 30 PS / 25 Nm |
| Friction pad stack height |
17 mm absolute |
| Clutch pinion |
Not included |
| Pinion type |
Cosa2 |
| Retaining ring |
Included in the package; trim approx. 5 mm before installation |
| Tool for shortening |
Standard side-cutting pliers |
| Modifications to the motor |
No modifications to the motor housing or clutch cover are required |
Free choice of gear ratio
The clutch pinion is intentionally not included in the set. This allows the primary gear ratio to be selected to match the specific engine.
Note on the clutch pinion
A Cosa2-type clutch pinion, available separately, is required
The number of teeth and tooth profile must match the installed primary sprocket
Straight-toothed and helical-toothed components must not be combined
Check the primary sprocket and desired gear ratio before ordering
Compatible Vehicles
This version is intended for numerous Vespa large-frame models from approximately 1963 onward, as well as for the PX, T5, Cosa, and technically equivalent licensed models.
| Vespa GL / GT |
GL150 (VLA1T), GT125 (VNL2T) |
| Vespa Super |
Super125 (VNC1T, depending on the series), Super150 (VBC1T) |
| Vespa Sprint |
Sprint150, Sprint150 Veloce (VLB1T) |
| Vespa GTR / TS |
GTR125 (VNL2T), TS125 (VNL3T) |
| Vespa Rally |
Rally180 (VSD1T), Rally200 (VSE1T) |
| Vespa PX |
PX80, PX125, PX150, and PX200, including Lusso, Arcobaleno, Disc, and MY |
| Vespa T5 |
PX125 T5 and T5 Classic |
| Vespa Cosa |
Cosa 125, 150, and 200; Cosa 1 and Cosa 2 |
| Vespa Augsburg |
150 T/4 (VGLA1T, VGLB1T), with compatible primary drive |
| Motovespa |
200 DS, 200 DN, as well as compatible PX, Iris, T5 Sport, and TX models |
| LML |
Star, Stella, Deluxe, and DLX 125/150 with 2-stroke PX engine |
For licensed models and modified engines, the clutch mount and primary drive must be checked before installation.
Scope of Delivery
1x original Stingworks Sei Giorni GP clutch basket including reinforced hub
1x BGM PRO 6-disc lining set
1x matched set of steel discs
8x BGM PRO XL clutch springs
1x brass clutch thrust washer
1x retaining ring for the clutch basket – trim approx. 5 mm before installation
The clutch pinion is not included.
Note on the 17-mm version
The assembled set of friction and steel plates has a total height of 17 mm. This version positions the clutch basket to fit the clutch mount on later Largeframe, PX, T5, and Cosa engines.
The version for Wideframe and early Largeframe models uses a 19 mm-high lining stack. The clutch basket and hub are identical for both versions; only the lining stack height—and thus the axial position of the clutch basket—differs.
Installation Instructions
The set is shipped unassembled
Install the friction and steel discs in the specified order
Use a compatible Cosa2 sprocket that matches the existing primary sprocket
Shorten the retaining ring by approx. 5 mm before installation
Standard side-cutting pliers can be used for trimming
After shortening, insert the retaining ring completely into the designated groove
Check that the retaining ring is seated correctly and without tension around its entire circumference
Check the friction plate stack height, separation travel, and axial play
Ensure there is no contact between the clutch and the clutch cover
Coat new friction discs with suitable transmission oil before installation
Adjust the retaining ring before installation
Before final installation, the retaining ring should be shortened by approximately 5 mm. This allows it to be positioned correctly in the groove of the clutch basket.
Required shortening: approximately 5 mm
Suitable tool: side-cutting pliers
Do not excessively widen or bend the ring after trimming
After installation, check that the ring is fully seated in the groove
Do not install the clutch until the ring is correctly and securely seated
FAQ
With the included spring set, the Stingworks Sei Giorni GP is suitable for setups with over 30 PS or more than 25 Nm. For high-performance engines, the spring set can be further reinforced.
The 6 friction plates provide a large effective friction surface. This allows high torque to be transmitted even with comparatively low spring force. This reduces the amount of hand force required on the clutch lever.
No. With the correct vehicle application and proper installation, the clutch can be used without modifying the engine housing or the stock clutch cover. Only the supplied retaining ring should be shortened by about 5 mm to ensure a proper fit.
No. This version is supplied as a complete installation kit for self-installation.
No. A Cosa2-type clutch pinion, available separately, is required. The number of teeth and the tooth profile must match the installed primary sprocket.
The clutch basket and hub are identical for both versions. The different lining stack height positions the clutch basket to fit the respective clutch housing. This 17-mm version is intended for later Largeframe, PX, T5, and Cosa engines.
It is suitable for various compatible Motovespa and LML models. Since variations are possible depending on the model year and engine version, the clutch mounting and primary drive must be checked before installation.
Yes. To ensure a proper fit, the retaining ring should be shortened by approximately 5 mm before installation. This can be done easily with a side-cutting plier. After insertion, check that the ring sits completely and without tension in its groove.
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