Powertrain Ø 43 mm Includes: Cylinder Ø 43 mm Piston Ø 43 mm complete with segments and pin Cam wheel, Valve pusher, Valves with spring and plate Crankshaft with bearings and bearings Models: HT 133 HT 135 FS 131 FS 131 R FS 311 FR 131 T KM 131 R BT 131