FITS VESPA PX 125/150 ,COSA 125,SPRINT 3 PORT, LML 2 STROKE,

MALOSSI 178 MHR57
The MHR cylinder range is aimed at the advanced tuner who wants to get the most 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 21-28PS.

• Stroke x bore: 57xØ63mm
• Displacement: 177,59cm³
• Exhaust angle: 178,2°.
• Angle of overcurrent: 119.2°.
• Exhaust angle: 29,5°.
• Pinch point: 0.7mm (piston is 0.2mm back in the top dead center)
• Compression: 1:11,25
• Overcurrent channels: 7
• Piston rings: 1
• Ignition timing: 18° f.o.t.

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. The BGM BigBox Sport or the RR-Box are suitable as exhaust systems. Both support the cylinder very well in the intended speed range and allow the full potential of the cylinder to be exploited.