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Clutch -SC, Wideframe, type Cosa2/FL- for primary gear Bollag Motos/Stoffi's 64/65 tooth (helical) - Vespa 125, VN1T (60001-), VN2T, Vespa 150 VL1T, VL2T, VL3T, VB1T, ACMA 150 GL (1956-1958) - 23 tooth
Part no.:
SC6423L
Description
Complete sport clutch for Vespa Wideframe models from year 1954 (VN1T (60001-), VN2T, VL1T, VL2T, VL3T, VB1T, ACMA (56-58)
The SC clutch is based on the mature and proven BGM Superstrong clutch for the PX models. It thus offers a modern and stable clutch technology for the 125-150cc Vespa Wideframe engines from year of manufacture 1954.
These already have a clutch cover whose three fixing screws are outside the outer radius of the cover. This therefore corresponds to the modern standard of the Vespa PX models. The older models before year of construction 1954 (e.g. VM1T/VM2T) still have internal screw connections. With these no large clutch types fit like the one shown here with Øa=115mm. We offer here our own coupling type.
The big advantages of a conversion to the SC coupling are:
- Very easy to pull
- Separates very clean
- Fast and precise gear changes
- Very stable and perfect for tuned engines
- Incl. spacer, gasket, washer, clutch nut, crescent and o-ring
FIT
The SC clutch replaces the conventional clutch type, the Vespa from about 1954.
Thus usable in Vespa 125, VN1T (60001-), VN2T, Vespa 150 VL1T, VL2T, VL3T, VB1T, ACMA 150 GL (1956-1958).
MODIFICATIONS
Since the clutch has a larger diameter, minor modifications to the engine case and clutch cover are required for installation. This involves removing material from the drip tab (for the transmission oil) positioned at 12 o'clock in the engine case as well as in the clutch cover. At the face on the 9 o'clock position also ensure sufficient freedom of movement, if necessary, remove some material here. The set comes with a spacer and seal. These provide for a greater distance of the clutch cover to the clutch, in order to cushion the greater overall height of the clutch.
TRANSMISSIONS
More powerful engines require longer reduction ratios to maximize their potential, otherwise the engine will literally rev to nothing. Vespa wideframe models all come from the factory with a primary reduction ratio of 22/67 (clutch primary gear).
'Engine halves stay to variant'
The easiest way to install a better clutch and at the same time a longer ratio is to use our SC6723L clutch. This uses a clutch pinion with one tooth more (23Z instead of 22Z) and can be used with the original primary wheel (67Z). This alone increases the top speed by about 5km/h. Ideal for light tuning or series engines that are driven with a high-torque exhaust system.
'Engine halves must be on variant'
Engines that have been significantly increased in power (e.g. tuning cylinders, exhaust and carburetor) require a longer than the plug&play possible 23/67Z ratio. This involves changing not only the clutch pinion but also the large primary gear in the engine. For this it is necessary to disassemble the engine completely. A work which is worthwhile itself however and in the course of a revision no more work makes.
The Wideframe engines from about 1954 on have the more modern design of the primary drive, easy to recognize by the cover disks, which are fixed by 6 rivets. These primary drives can be equipped with primary wheels from bgm Pro as well as Bollag Motos/Stoffi's and reinforced bgm primary repair kits.
Helical or straight?
The bgm Pro primary gears for the Wideframe are always straight toothed. They offer the advantage that they do not exert axial (lateral) forces on the crankshaft and the auxiliary shaft. This effectively eliminates the risk of premature wear of the crankshaft bearing seats due to wandering bearings. The straight-toothed bgm Pro gear parts are also manufactured with such high precision that they run just as quietly as the original helical-toothed ones.
In general, longer ratios can be achieved with the bgm Pro primary gears (62Z/63Z) than with the helical gears from Bollag Motos/Stoffi's (64Z /65Z). As long as you stick with one type of gearing (helical or straight), all sprocket/primary combinations offered are compatible with each other (a 23Z clutch can be run on the 62Z or even 63Z primary, or a clutch can be converted from 22Z to 24Z without having to change the primary).
Unlike most PX and smallframe models, the wideframe engines do not simply use the same secondary gearbox all the time, but depending on the engine type there are different 3-speed and 4-speed gearboxes that always consist of the same primary reduction of 22 teeth on the clutch pinion and 67 teeth on the primary wheel.
For many engine types it is possible to convert from a 3-speed transmission to a 4-speed transmission. Therefore, it is necessary to select the new primary drive to match the gearbox used. We have based our selection on empirical values from everyday use. As a reference we use a Rally 200, which produces about 9-10hp on the road and runs about 100km/h at 6.000rpm.
The following primary reduction ratios are based on this driving performance, since the engines of the Wideframe lift similar power and torque values to the rear wheel due to the power increase.
Using the original tire size (3.50 x 8") of the respective models, the following ratios result for performance-enhanced vehicles:
VL, VB (3 speed, 14-56, 20-49, 27-42).
- Clutch pinion 22 teeth(straight toothed)
- Primary gear 64 teeth(straight toothed)
(optional also 23 / 65 helical teeth)
GS 150 VS1-5 At this time, due to the design of the clutch, no changes to the primary are possible.
4 speed ACMA GL and replica (Pinasco) (13-57, 18-52, 23-47, 27,43)
- Clutch pinion 23 teeth (straight toothed)
- Primary gear 63 teeth(straight toothed)
(optional also 24 / 65 helical gears)
4-speed BGM Sport on 3.50-8" (12-57, 13-42, 16-38, 19-35)
- Clutch pinion 25 teeth (straight toothed)
- Primary gear 62 teeth (straight cut)
(US18419)
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€189.00 *
incl. VAT plus shipping costs
The item is ordered and will be in stock soon
P
For this item you get
fidelity point/s
| Gear box (classic scooters) | |
|---|---|
| number of teeth small primay sprocket: | 23 |
| combinable primary sprockets: | 64 teeth helical (Bollag Motos, Stoffi's), 65 teeth helical (Bollag Motos, Stoffi's) |
| Clutch (Largeframe, Wideframe) | |
| teeth clutch sprocket: | 23 |
| height of clutch sprocket: | 9.5 mm |
| number of springs: | 8 |
| number of friction discs: | 4 |
| friction material: | cork |
| thickness friction discs: | 3.2 mm |
| number of steel discs: | 3 |
| inner diameter: | 108 mm |
| inner diameter clutch spider: | 108.8 mm |
| outer diameter clutch spider: | 115 mm |
| manufacturing method clutch spider: | deep-drawn |
| clutch spider reinforced: | |
| OEM numbers (for comparison purposes only) | |
| Scooter Center | SC6423L |
Please inform me once the product is available again.
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