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

Product Code: BD08786

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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.