Cranks: The crank is the same as a Rally & PX200 crank which is readily available.

Standard Barrel: The standard barrel has two main ports and a smaller third port. The barrel is not really useful for tuning as all the ports and transfers are internal to the barrel casting.

Kits: Any large frame kit over 200cc.

Ignition: The P series bikes have a 12V electronic ignition system that is bulletproof. Spares are easy to obtain. There is no real option for upgrading this ignition system.

Gearbox: Most later large frame gearboxes after the Vespa 150 Sprint will fit. The clutch can be upgraded to a "Cosa" clutch for better performance.