The TGA belt drive clutch to suit all Norton/AMC type gearboxes, as used on their Manxes and G50/7Rs.
It is a 68 tooth, splined plate 6 spring dry clutch suitable for a wide range of classic motorcycles, Tritons & Cafe Racers. The standard centre requires a minimum of 22mm of mainshaft spline length (full depth spline, don't include the 'runout') to fit correctly. Sleeve nut centres are also available for very short mainshafts. This will change the alignment, but with the versatility of a belt that shouldn't be a major problem.
Drum lightening is recommended to let the dust out of the drum; pressure plate lightening looks very pretty and reduces the weight of the pressure plate by 25%. Alloy plates lighten the assembly further. Because the alloy plates are thicker, the clutch will only accommodate 3 alloy plates + 4 fibre plates which is good for around 60 hp dry. With the thinner steel plates, 4 + 5 fibre plates fit, which will transmit about 75 hp dry.
The standard clutch assembly weighs approx 2.7kg.
- Drum lightening saves 105g
- Pressure plate lightening saves 80g
- Alloy plates save 315g
All components are available individually as spares. Complete belt drive set ups using this clutch are available for Manx, G50/7R, Norton twins & Triumph pre-unit twins; there are so many possible permutations that please contact us by email to discuss.
A 42T chainwheel version of this 6 spring clutch is also available - see the Chain Primary Drive Clutch.