PERFORMANCE
The ready-to-install clutch is tuned for a power range of up to approx. 20 hp / 22 Nm by means of the fitted clutch springs. Reinforced springs (available separately, BGM PRO XXL) extend the power range of the clutch to over 40 hp. It still remains easy to operate.
VEHICLES
The bgm Pro Superstrong replaces any conventional clutch type as used in the
Vespa Largeframe models with rotary intake valve control from around 1956.
Can be used in Vespa VNA, VNB, VBA, VBB, T4, GL, Super, Sprint, Sprint Veloce, GT, GTR, TS, Rally, PX, Cosa and T5.
MODIFICATIONS
Vehicles with less than 180cc (ex works) require the clutch cover for 200cc models, unless the original clutch cover is to be modified.
Vehicles built before 1998 must be minimally modified to fit the Superstrong clutch (see documents under Downloads).
COVER TYPES CR
In the CR version, we offer the clutch with the cover type of the Honda CR80/VFR400.
These have a larger effective radius, less weight, wider plates and a very resilient lining material. The advantages are a lighter clutch that separates faster and is still extremely resilient.
RELATIVES
Clutches with straight-toothed pinions can only be combined with the corresponding straight-toothed primary wheel. The engine must be fully opened for this. The extra-long primary reduction gears based on the 62/63-tooth primary sprocket are only available with straight teeth. The high torque of the motors, which require such a long reduction ratio, is transmitted directly to the gearbox via straight teeth without exerting any lateral forces on the bearing of the auxiliary shaft. Thanks to precise manufacturing, the straight-toothed drives are just as quiet as the helical-toothed drives.
TRANSMISSION
A primary drive consists of a clutch (pinion) and primary gear.
Piaggio has already combined 65, 67 and 68-tooth primary gears with different clutch pinions ex works.
This makes it easy to adapt the overall gear ratio to the engine power.
A distinction is made here between 67/68 and 65 teeth.
Due to the different so-called gear wheel module, the following wheel/pinion combinations can be used.
Please note: BGM is the only manufacturer to offer different 22T pinions for 67/68T and 65T primary gears. This is the only way to guarantee maximum stability.
Primary sprocket | Primary wheel originally installed in | BGM Superstrong clutches that can be used |
62Z* | x | 23T*, 24T*, 25T* (straight-toothed) |
63Z* | x | 24Z*, 24Z*, 25Z* (straight-toothed) |
65Z | Rally200, PX200 | 22T*, 23T, 24T* |
67Z | All 125-180cc models up to 1977 | 20Z , 21Z , 22Z, 23Z* |
68Z | All 80-150cc models from 1978 onwards, all Cosa | 20Z , 21Z , 22Z, 23Z* |
*BGM sprocket with special module!
EXAMPLES
(US)