Vespa Small Frame - Malossi 133
Malossi's installation instructions (above) are pretty goofy but a good place to start. Here are the basic specs:
This kit is pretty unique as it can be used with normal crank induction, or the crankcase hole can be blocked up and a separate reed valve induction hole in the barrel can be used. Thanks to First Kick Scooters for the pictures.
The shot above shows the gasket face
with the enlarged opposed transfers. The exhaust port is in the same
place as the standard barrel. Just below the ring (which was in the
barrel when I took the picture) and above the three small rectangular
transfers is the reed valve intake option.
The above shot shows the reed valve
intake option. This can be blanked off if you want to use the standard
crank induction system and is a nice addition to the kit. It is located
on the opposite side from the exhaust.
Another shot of the reed intake below
the three rectangular ports.
Check out the port layout. Three main
transfers translate into seven barrel ports for extra power.
The piston is also very different than
the standard Piaggio item. Windows are also cut in around the ends of
the wrist pin which can't be seen in this image.
The head is specific to this kit but
could use a bit of polishing inside the combustion chamber before
installation. There is no head gasket, but rather a rubberish O-ring
that fits in the circular groove.