Yamaha Vertical Minarelli MHR 47mm "70cc" Cylinder Kit

  Malossi MHR 47mm "70cc" cylinder kit for Vertical Minarelli engines.  These were commonly found on early pre-bug type Yamaha Zuma, BW'S, MBK Booster, etc.  This is an absolute powerhouse of a kit and we recommend only experienced tuners give it a go. You absolutely should pair this with a performance crankshaft, a good exhaust like the Malossi MHR, and a large carburetor.  From Malossi themselves: CYLINDER KIT MHR TECHNICAL FEATURES CYLINDER Material: special aluminium alloy with high percentage of silicon and titanium that guarantees exceptional strain strength even at high temperatures. Heat treatment: special quenching and stabilizing treatment that gives the material increased toughness and strength, guaranteeing that mechanical and size specifications will remain unaltered for temperatures of up to 250 °C. Chip-forming machining: carried out on NC machining centres with extremely-limited size and shape tolerance (roundness, perpendicularity). Inner surface coating: effected us