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The modifications of the engine housing can be segmented into two categories, one the intake (crank housing intake only) and two the transfer ports.

This is where the most horses are hidden. Especially on the Vespa and Lambretta motors it is often necessary to modify the transfer ports. Often the existing transfer ports have to be removed (welding) to be able to grind new more flow optimized Ports. Base Rule: The less turbulence the better.

Vespa PX:
Main Ports

It is a must to adjust the transfer ports on the Vespa PX200 if you want to use a Polini 207 or Malossi 210 cylinder kit. After the transfer ports have been removed the sealing surface (contact surface for the cylinder and gasket) is level planed because the existing transfer ports have been filled with aluminium by welding. It is also necessary to re-mill the opening so that the cylinder fits on the housing. The last step is to grind new transfer ports in the housing that perfectly fit the new cylinder and then polish them.

Transfer port PX 200 welding, planing, milling, grinding and polishing. - 100 EURO

Removing transfer port only PX 200 - 40 EURO

Just milling the cylinder opening in the housing - 50 EURO

Grinding and polishing new transfer port PX 200 only - 40 EURO

Inlet Port

To modify the intake on Vespa PX motors for membrane intake it is necessary to add some material on the clutch side by welding. Without welding you may break through the housing on the clutch side while enlarging the intake channel. The intake channel will be enlarged and polished. Also the intake block will be slightly modified.

Intake PX welding on the clutch side, enlarge and polish the intake channel. - 90 EURO

Welding on clutch side only PX. - 40 EURO

Enlarging and polishing the intake only PX. - 65 EURO

Vespa Smallframe
The above explained modifications can be transferred to Vespa Smallframe housings, Lambretta housings and other brands.

Main Ports

If a 130ccm Polini in the modified version (5mm spacer at the bottom and large channels) or a modified Malossi 136ccm is used on a Vespa Smallframe it is also recommended to add some material on the ignition side (the stator has to be tweaked a little) and on two spots at the clutch side and the cylinder contact surface. The surface can be level planed easily since it will be welded at just a small spot.

Smallframe Transfer port welding, level planing, grinding and polishing. - 90 EURO

Welding and planing only. - 60 EURO

Grinding and polishing only. - 45 EURO

Inlet Port

Enlarging and polishing the intake maybe up to a Malossi reed block. - 85 EURO

Lambretta

Main Ports

Lambretta fit transfer ports to cylinder - grinding and polishing. - 60 EURO

Crankcase welding up and machine for fit a 65 mm stroke crank

Lambretta crank case welded up at the outside and machine it CNC. Machine all surfaces.

370 EURO

Very big main ports

Welding at the motor casing very big ports (to fit a extrem modified TS1). machine all surfaces and grinding and polish the ports at the casing.

about 165 EURO

Scootermatic

Main Ports and inlet

Scootermatic transfer ports to cylinder and inlet - grinding and polishing. - 80 EURO

Here some examples :

Milling and polishing inlet and main ports at a piaggio scootermatic 180 ccm motor casing: