GT EVO 266 engine caseCapacity Air cooled 266 cc Bore Aluminium plated 72. 8 mm Stroke 64 mm Rod RM250 120 mm Transfers 130 deg. Exhaust 179 deg. Based on the Simonini EVO para glider engines. The heavy duty Gran Turismo custom crankshaft and Aprilia RS125 generator ignition is combined with the convenience of air cooling and TS1 style exhaust flange. Casing, side casing, mag housing, crank, cylinder, head, piston, cylinder packer, seal plates, stator plate, gearbox end