for Vespa 50-125/PV/ET3/PK50-125/S/XL/XL2 3 discs 4 plates sintered 10 spring(s) stiffness: L reinforced, complete TUNING RACE – for professionals Product description Attention all power hungry tuners, your waiting is over! The tuners MMW have already written history with their 7 plate motorcycle style clutch for the LAMBRETTA, winning SCOOTERING magazines test for ‘heavy duty clutches’. The Hartz4 clutch is the small frame motor equivalent: A 4 plate motorcycle style clutch. The original clutch that the small frame motors are equipped with have three friction plates. The higher performance clutch plate combinations have separation problems due to a lack of space for their extra plates. The Hartz4 clutch solves this problem through the use of a sintered clutch friction plate surfacing that is produced using a special mix of materials and have more grooves to channel excess motor oil away from the fiction plate contact area. The improved oil channelling raises the the