The Pinasco four-speed gearbox upgrade kit for wideframe Vespas makes life much easier when carrying a passenger, going up hills and especially with a tuned engine!
The jumps between the gears are much smaller than with a standard 3-speed gearbox, the kit will fit most Vespas from 1953-1959, please check with us if you are unsure.
The fourth gear has the same gear ratio as the original third gear found in the standard VN and VM gearbox types.
A longer overall ratio can be achieved by fitting a primary drive kit with a higher than standard gear ratio.
The Pinasco 4-speed conversion closes the gaps between the gears and eliminates the big jumps between the three-speed type, the engine will stay in the power band when accelerating and is perfect for an engine fitted with the Pinasco 160cc Nordkapp kit, even for a standard 150cc engine this is a very useful upgrade.
The gear ratios are:
1st gear – 52/13
2nd gear – 52/18
3rd gear – 47/23
4th gear – 43/27
The engine casings will require a small, easy modification inside the engine, it is only a little bit of filing to stop a gear from rubbing.
You will need to use the needle roller bearings for the input shaft from the PX 125-200 engine and you will also need the gearbox selector from the Vespa GS 150 engine.
The kit includes: input shaft, loose gear cogs, cruciform, selector rod, output shaft, counter shaft and English language instructions.
The kit fits best with the VN/VL/VB1 type engines which have the kickstart ratchet with the brass bush but the kit can be used with the earlier Piaggio/Douglas/MotoVespa roller bearing type by using the original driveshaft or using a specially adapted brass bush.
The kit will fit the following engines - (ensure you use a 57mm stroke crank):
GL2, 42L2, 92L2, 102L2, Continental, Clubman
V30-33 from 1952
ACMA 125 `51-`55
ACMA 150 GL VGL1T