Racing Cylinder SERIE PRO by
Bollag MOTOS 137cc for Vespa
Ø 57,0mm, cast iron, 3 ports,
with cylinder head
FOR RACE USE ONLY
A 131cc racing cylinder, produced by BOLLAG Motors as part of the SERIE PRO range of components. The basis of this kit is provided by a cast-iron cylinder with three transfer ports that has been equipped with a high-end piston from GRAND-SPORT and a CNC machined cylinder head.
This cylinder can be 'Plug & Play' mounted to all Vespa wideframe motors to the 125cc motors which are equipped with a 54mm stroke (original) crankshaft as standard. The third 'boost' port is blocked off and is operated in combination with the port windows found on the skirt of the piston. The crankcase of the wideframe motor will require no modification or port-matching to fit this cylinder. This cylinder kit includes a high end GRAND-SPORT piston equipped with two narrow 1.5mm piston rings, a CNC machined cylinder head and all necessary gaskets and fittings etc..
Cast iron / 57.4mm bore /3 ports
SIP-TIP : To realise the potential of this performance cylinder we recommend its combination with at least a SIP Road exhaust and an electronic ignition system.
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