The new .45 GPX Direct Drive engine features a new design 10 port Piston/Liner, M-Line design crankshaft, Billet front housing with two bearings (one ball bearing and one needle bearing). 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, Standard plug head (Turbo head optional), new 6 bolt Green anodised double water cooling jacket and Black anodised crankcase.
-  4.6 HP / 29,000 RPM
-  Bore: 21.8 mm
-  Stroke: 20.0 mm
-  Displacement: 7.46 cc