Racing Cylinder VMC RV-A 100 cc

for Vespa 50/
K50/
/
L/
L2
aluminium
8 ports

54mm
stroke 43mm
1 piston ring(s)
with cylinder head
8-times bolted
outlet 2-parts
incl. reed valve intake manifold

TUNING RACE – for professionals

For race use only. Not admitted in the area of the German StVZO! Product description
VMC RV-A 100
54mm cylinder with reed valve and manifold for Vespa smallframes VMC have introduced a game changer to the 102cc smallframe tuning cylinder class in the form of the RV-A 100. Technical solutions, previously unseen on cylinders of this capacity, enable a performance to be achieved that was before reserved for motors fitted with a 51mm stroke crankshaft. The cylinder is constructed using aluminium and is equipped with a plated bore. The cylinder head is CNC machined, centralised, anodised, has an ‘O; ring gasket and is attached using eight bolts. It has a 54mm bore and the stroke, as with most cylinders covered by the smaller cowling, is 43mm. These produce a cubic capacity of 98.43cc. The cylinder is supplied with fresh fuel/air mixture through a reed valve located on its flank. It is first channelled over eight transfer ports to the cylinder and consist of four located around the sides, two supplied directly from the reed valve and also two boost ports. The exhaust port is bridged. For the exchange of gas the ports offer 113
timing for the transfer ports and 171
for the exhaust. The manifold, included in the delivery, has a diameter of 25mm and is equipped with a four-petal, rubber-coated reed-valve. To set up the squish band clearance exactly there are four cylinder base gaskets of differing thickness included in the kit.
Further manufacturers recommendations include:

Squish band clearance: 0.8mm
Cylinder nuts: 13
14Nm
Cylinder head nuts: 10
11Nm
Carburettor size: 19
24mm
This cylinder enables the creation of a true wolf in sheep’s clothing project. Nobody could guess the performance potential lurking beneath such a small cowling. Also an ideal choice for all fans of high-revving motors!
Conclusion:
Loads of fun from a small capacity, combined with screaming high revs!
TIP: We can recommend the POLINI 24mm carburettor (#P2010166) as the ideal complement for this kit!