The Top Performances gearbox drum is reserved for those who really want an engine pushed and refined to the maximum, it is lightened and weighs about half the weight of the original one, which is not negligible given the weight of the latter, it brings a faster and more frank shifting with fewer misfires. However alloy certainly reinforced but all the same more fragile than the origin out of steel, to thus take precaution with the assembly not to mistreat it.
Tip: in case you have damaged the 2 cones of the lighter drum, you just have to take it to a turner who will fit you with stainless steel inserts by machining it at the front, thanks to these you can machine the drum location crankcases in order to install needle bearings of the diameter of the 2 cones, the gear change will be even more reliable, fast and precise, this technique is widely used in competition . Do not install a needle bearing if the cones of the drum are not replaced by stainless steel inserts because this will cause the opposite effect (seizing) since the alloy is much softer than the needles of the cage.
Mounts on 50cc motorcycles with gearbox equipped with the minarelli am3, am4, am5, am6 euro 1, am6 euro 2 engine :
APRILIA RS 50cc am6 engine from 1997 to 2006 (warning news after 2006 in derbi euro 3 engine)
APRILIA RX am6 engine (warning news after 2006 in derbi euro 3 engine)
APRILIA MX am6 engine (warning news after 2006 in derbi euro 3 engine)
APRILIA TUONO 50cc am6 engine from 1997 to 2006 (warning news after 2006 in derbi euro 3 engine)
BETA RR
BETA RR ALU
BETA CRE
HONDA HM
HONDA CRE
HONDA BAJA
HUSQUVARNA WXE
HUSQUVARNA CH
HM DERAPAGE
HM CRE
MALAGUTI DRAKON
MALAGUTI XTM
MALAGUTI XSM
FANTIC CABALLERO
PEUGEOT XP6
PEUGEOT XPS
MOTORHISPANIA RYZ
PEUGEOT XPS
PEUGEOT XP STREET
PEUGEOT XP STREET EVO
PEUGEOT XR6
MOTORHISPANIA RX
PEUGEOT XR7
MOTORHISPANIA RX-R
RIAJU RS1
RIEJU RS2
RIEJU RS2 MATRIX
RIEJU RS2 MATRIX PRO
RIEJU SMX
RIEJU MRX
RIEJU SPIKE
KEEWAY TX EN
YAMAHA DT
MBK X-LIMIT
YAMAHA TZR
MBK X-POWER
SHE RC O SM
SHE RC O EN DURO
SHE RC O HRD
SHE RC O EN DURO
ICC SM
And many other machines!
