As the 180 Cup Race series in Italy uses the 125 Runner fitted with a standard 172 Malossi kit there have been a number of new parts available for these motors that were not previously available. These include:

Competition Crankshaft with improved conrod, big end and semi-full circle.
Competition Exhaust to suit the standard 172 Malossi kit, worth approximately 2bhp (does not work on a 125 motor, and not as effective on a 180 motor unless the porting and cylinder head is modified to Malossi porting spec).
Uprated Clutch Springs, allowing a choice of springs to really make it move from standstill - essential if the competition exhaust is used.
25mm Race Carb Kit & Down-draft Inlet Rubber: the carb will fit the standard rubber but it interferes with the mudguard. It is supposed to be used with the race inlet rubber but this requires modifications to the bottom of the helmet holder box to create clearance. This is the best position for performance from the carburettor.

Our solution for road machines is to use the 25mm carb with an offset rubber to clear the mudguard and helmet compartment, and a large RamAir filter fitted onto a carb filter adapter. This clears the helmet holder base but does not line up with the air filter box outlet, so the air filter box is removed and a large RamAir filter and filter adapter used instead. If you wish to keep the air filter box there is now a 24mm flatslide Mikuni carb that will replace the original carb.

Malossi claim 26cv for the 180 Cup race scooters using exhaust, cylinder, crankshaft and carb conversion. Our experience on our Dynojet Rolling Road suggests that 23bhp is likely to be the average power output but that further work to the cylinder and cases would improve this.

The 180 motor has several differences to the 125. Most importantly, the cylinder is 65.6 bore and has a 2mm bigger cylinder spigot. This is why the cylinder will not fit the 125 motor without modifying the 125 cases. The crankshaft is beefed up slightly using a 22mm big end pin (125 is 20mm) and the crank web’s diameter is 2mm bigger to accommodate this - hence the case has a bigger opening for the crank web to fit into. The front pulley (variator) uses 20mm rollers (125 is 19mm) and the rear clutch has a cooling fan built into it to increase cooling. It is possible to use a Japanese conrod for improved reliability when padding the 180 crankshaft.