Description
Racing cylinder VMC CRONO 187CC
Powerful aluminum cylinder with 177ccm for Vespa Largeframe
VMC offers different cylinders for the Vespa Largeframe models. The main distinguishing feature is the cylinder base material used.
The CRONO 187 shown here is made in aluminum and hard ceramic coated. Thus, it is perfectly prepared for the high targeted performance of the kit.
The cylinder can only be driven with a special crankshaft with 110mm connecting rod length as well as 60mm stroke. For this you can use a crankshaft of the PX200 (long stroke) and turn the shaft on the clutch side (small web) to make it fit for the 80-125-150cc engine cases. Then use a conversion bearing with Ø15mm inner diameter as piston pin bearing.
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Bore: Ø63mm
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Stroke: 57mm (series)
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Connecting rod length: 110mm (series 105mm)
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Piston: cast aluminum
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Piston pin: Ø15mm
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Piston rings: 2pcs, 1mm thickness
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Cylinder head: Aluminum CNC
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8-bolt CNCcylinder head
The generous channel surfaces do not require long timing angles for its high power capability.
With 120°/178° and the resulting 29° advance angle, the cylinder for PX engines is already relatively sporty designed and reacts by the large Vorauslaß already very positivi to a good box exhaust system such as the BGM Touring 2.
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Steering angle: 120°/178
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Recommended squeezing edge: 1.3mm (±0.1mm)
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Tightening torque cylinder head bolts M6: 10-11Nm
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Tightening torque cylinder head nuts M7: 14-15Nm
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Enclosed gaskets: 0.2mm, 0.3mm, 0.4mm
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