Bearings: The flywheel side crank bearing is a two piece unit to making splitting the casings easier. This type of bearing can be used on other smallframes to replace the single flywheel bearing.

Crank: The crank is the same as the Vespa 90 and Primavera models up to the Primavera ET3. Any smallframe crank can be installed in this engine. Popular changes are to install a PKXL or PK125ETS crank which allows use of many different flywheels. Flywheel side bearings and seals will differ for these conversions.

Standard barrel: The original 100 barrel has three ports and can be used on the standard Vespa 100 or 90 models as the third port is completely contained within the barrel casting (i.e. no casing modifications are necessary. The barrel studs are short studs and pass only through the barrel base - the head is then bolted to the barrel. The Primavera ET3 barrel & piston can be used on this engine if the barrel studs are replaced with long ones to pass through the barrel to the head. Both the barrel and the piston will have to be replaced for this conversion.

Kits: Larger bore kits from Malossi and Polini (and others) will fit.

Ignition: The original 12V points can be replaced with a 12V electronic set up off a later Primavera ET3 or any of the PK range systems. Strangely, the 100 Sport flywheel is already set up for electronic ignition and only needs a stator and CDI change from a Primavera ET3 or other PK model.

Gearbox: Any smallframe gearbox will fit in the casings but almost all the parts will have to be replaced.