Racing Cylinder Wideframe for Vespa 125 VM/VN/ACMA/150 VB/VGL1/VL from SIP Scootershop
There is no substitute for displacement - except even more displacement. The overflows and timing of the original cylinders were optimised and the pistons were replaced. The modern aluminium cylinders from PINASCO offer significant increases in power and performance. With a stroke of 57 mm and a 60 mm bore, this kit enables a displacement of 160 cc. 5 overflows reliably supply the cylinder with mixture. The newly calculated cylinder head provides the right compression ratio.
Vespa Wideframe engine types
There are basically two engine types for the Wideframe Vespas: 1-channel and 2-channel engines.
There are only a few tuning options for the 1-overflow engine (1-channel) (recognisable from the outside by the exhaust pipe running along the side): CP19 carburettor kit, air filter, CNC cylinder head and contactless ignition system. The increase in power is nevertheless noticeable. Alternative: Organise a used two-channel engine (approx. 250-300 €) and put the 1-channel engine on the shelf. The licence builds from ACMA, Hoffmann, Motovespa, Allstate and Douglas have the same engines, but here the 1-channel engine (1 overflow) was used longer compared to the Italian production from Pontedera.
From 1953 onwards, the Italian production was equipped with a 2-channel engine from the VM model series onwards. In the case of the licensed models, the changeover was not introduced until about 1955. Douglas Vespas always have a 1-channel engine. All 150 cc Wideframe models have a 2-channel engine. With the 2-overflow engine (2-channel) (recognisable from the outside by the exhaust pipe running downwards) the result is really impressive. With the right components, the engines achieve an output of 10-14 hp with a powerful 15 Nm of torque. And that's enough to swim along in traffic or climb a pass summit.
