Cylinder -VMC GS 55 – 125 ccm Ø55.4, stroke=51mm, cast iron- Vespa PV125, ET3, PK125 online ora

Description

Cylinder kit VMC GS 55 125cc for V50/50N/PK50 (with conversion crankshaft), PV, ET3, PK

• Bore: Ø55,4mm

• Stroke 51mm

• Displacement 124cc

• Steering angle: overflow 124°, exhaust 174°

• Flat top aluminum alloy piston with high silicon content

• Die-cast aluminum cylinder head

• Steel piston rings

• 8-position cylinder head gland

• Sealing set with 5 foot seals to adjust the squeezing edge

Recommended crush edge 1,2mm
Tightening torque stud bolt M6 11-12Nm, nuts M7 14-15Nm

Suitable for crankshafts with 51mm stroke and 97mm connecting rod (both like series SS90, V90, 90 Racer, PV, PK80/125)

VMC states that the GS 55 is currently the most powerful cast iron cylinder of this displacement on the market. This makes it possible to either further tune an existing 125cc engine and still remain within the displacement limit suitable for the driver’s license. Likewise, this cylinder can also be used to convert the 50-80cc engines to 125cc, in order to approve them by an individual acceptance (TÜV/DEKRA) for use on public roads. The 50cc engines need the crankshaft, studs and cylinder cover and exhaust of the 125cc models, the 80cc engines (PK80) only the studs and the cylinder cover and exhaust.

NOTE: Since the cylinder is designed for high power output, it has a generous overflow area at the base of the cylinder. Therefore, minor machining of the crankcase is required for installation. This involves removing the crescent-shaped protrusion of the fan wheel tunnel. If an original pole wheel is to be used, it must be turned off on the back side. Alternatively, an ignition from BGM or VAPE can be used which already offer sufficient space.

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