PIAGGIO revolutionized the world of large frame motor transmissions with the introduction of the COSA 2 clutch. All the existing large frame clutch problems were solved almost overnight.
Since around 1995 the COSA 2 clutch has been used in all VESPA PX EFL/'98/MY /'11 and of course, the COSA 2 models build by PIAGGIO. It comes complete with 4 friction plates, 8 springs and a sturdy clutch basket design. Due to the higher pressure created by the increased number of springs and the increased frictional surface area power can be transmitted more effectively between the crankshaft and the gearbox. Precision laser-cut clutch plates prevent any problems with snagging clutches. No jerking, no slipping, an optimal release point and all that combined with a light, easy clutch lever action, even when using a stronger set of springs.
The gear cogs for the COSA 2 clutch are available with 20, 21, 22 and 23 teeth. The cogs with 20 or 22 teeth fit into 125-150cc motors and the 21 or 23 toothed cogs into the 200cc motors without having to also replace the primary driven gear cog. If, on the other hand, another primary gear cog or the DRT clutch gear cogs are used, more transmission ratios are possible. All VESPA large frame models since the VNA/VNB range up till 1994 can be fitted with the COSA II clutch. With these 125-150cc models the existing clutch cover must either be modified due to the largest size of the COSA 2 clutch conversion, or replaced with the clutch cover from the 200cc motor with a suitable pressure plate.
In the past, there were enormous fluctuations in the quality of NEWFREN and PIAGGIO parts. That is why we recommend that all Largeframe riders with more that 15PS use the SIP clutch. This COSA 2 sport clutch is equipped with the SIP clutch basket that was especially produced for this purpose: hardened by induction, precise notch, reinforced securing ring, interior part can be equipped with 16 springs, one piece ring, etc. This clutch won’t slip, is ready for plug&play use and works just the way it was originally supposed to.
Conclusion: The top clutch for everyday riders. Perfect price/performance ratio.
Attention: Not compatible with PINASCO clutch bush Part.-No. 59366000!
SIP-TIP: Don’t forget to order new pressure plate, push rod, locking washer and nut. Make sure to soak the clutch plates in gearbox oil once again.