Vespa PX125 PE Sprint Veloce Malossi MHR 187cc 3 Port Double Exhaust Port Racing Cylinder Kit

Vespa PX125 PE Sprint Veloce Malossi MHR 187cc 3 Port Double Exhaust Port Racing Cylinder Kit

MALOSSI 187 MHR60
The MHR cylinder range is aimed at the advanced tuner who wants to get the maximum out of his engine. A corresponding knowledge of the complex thermodynamic and mechanical processes in the engine is tacitly assumed here. A nice feature is the screw-on exhaust flange. This allows a further reworking of the exhaust port which can greatly increase the performance of the cylinder. Malossi states the achievable power at delivery with 22-30PS. For the use of the cylinder a crankshaft with 60mm stroke is necessary.

• Stroke x bore: 60xØ63mm
• Displacement: 186,94cm³
• Exhaust angle: 178.5°.
• Angle of overcurrent: 122.5
• Forward exhaust angle: 28°.
• Pinch point: 0.8mm (piston is 0.3mm back in the top dead center)
• Compression: 1:11
• Overcurrent channels: 7
• piston rings: 1
• Ignition timing: 18°v.Ot.

A major revision of the original rotary valve inlet is recommended, better in terms of maximum performance and driveability is the conversion to a diaphragm controlled inlet.