The new .45 RS EVO H/O crankshaft design offers greater stability at high RPM plus the crankshaft is supported by twin ball bearings. Also features a steel conrod with needle bearing big end and Zimmerman disk intake with increased section in central area. Includes a bolt on Carburetor with remote needle valve and new Gold anodised double water cooling head.
-  4.5 HP / 29,000 RPM
-  Bore: 21.8 mm
-  Stroke: 20.0 mm
-  Displacement: 7.46 cc