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The most popular aftermarket exhausts are those supplied by LeoVinci in several different styles:
Sito Plus
Standard-looking box with enhanced performance. Does not usually require any transmission modifications on a standard bike. It is a useful way of obtaining a bit of extra power when replacing a standard box.
SP3
This is a standard style box but it increases performance by around 20% on air-cooled and 10% on water-cooled motors. It is supplied with rollers to fit the standard transmission parts.
Navigator
Latest style box from LeoVinci. Gives more performance than the SP3 and is supplied with rollers and sometimes clutch springs. Not as good as the handmade exhaust.
Handmade Exhaust
Gives 35/40% power increase on air-cooled and around 25% on water-cooled motors. This comes with rollers and clutch springs so that the transmission works in the right range.
These exhausts are all very reliable, improving both top speed and acceleration.
Malossi do two exhausts. One is a road exhaust called Wild Lion which is not normally used as the LeoVinci gives the same performance at a cheaper price. The other is a race expansion which is extremely expensive but will not work with the centre stands and is designed to work with MHR replica and MHR race cylinders.
Polini do a range of exhausts but the basic two systems are covered by LeoVinci. The race box is cheaper than the Malossi version but again is designed for their cylinders and will not clear a stand. They do a road expansion chamber that suits the 70cc kits very well, the cast-iron and aluminium road units from both Malossi and Polini. It is slightly dearer than the LeoVinci carbon fibre handmade, but works at a lower RPM range than the LeoVinci, which means it suits the MHR and aluminium kits better when used on the road.
The clutches are available in two and three shoe types. Aftermarket springs are available to alter the biting point to tune the transmission. On higher states of tune where enough slip cannot be generated by the springs, aftermarket clutches are available that have a choice of springs and lighter shoes to give more adjustment. The ultimate clutches are Polini speed clutches and Malossi delta clutches. These have a choice of springs and spring positions and movable weights to allow the clutch to work with any motor from standard to full race.
Cylinder kits are available in several formats, basically cast-iron with or without cylinder heads, road aluminium with cylinder head and race aluminium with cylinder head.
Sito Plus
Standard-
SP3
This is a standard style box but it increases performance by around 20% on air-
Navigator
Latest style box from LeoVinci. Gives more performance than the SP3 and is supplied with rollers and sometimes clutch springs. Not as good as the handmade exhaust.
Handmade Exhaust
Gives 35/40% power increase on air-
These exhausts are all very reliable, improving both top speed and acceleration.
Malossi do two exhausts. One is a road exhaust called Wild Lion which is not normally used as the LeoVinci gives the same performance at a cheaper price. The other is a race expansion which is extremely expensive but will not work with the centre stands and is designed to work with MHR replica and MHR race cylinders.
Polini do a range of exhausts but the basic two systems are covered by LeoVinci. The race box is cheaper than the Malossi version but again is designed for their cylinders and will not clear a stand. They do a road expansion chamber that suits the 70cc kits very well, the cast-
The clutches are available in two and three shoe types. Aftermarket springs are available to alter the biting point to tune the transmission. On higher states of tune where enough slip cannot be generated by the springs, aftermarket clutches are available that have a choice of springs and lighter shoes to give more adjustment. The ultimate clutches are Polini speed clutches and Malossi delta clutches. These have a choice of springs and spring positions and movable weights to allow the clutch to work with any motor from standard to full race.
Cylinder kits are available in several formats, basically cast-
