Patent ID: 7004135

Claim:
A starter unit for an engine comprising a crankshaft rotatably supported in a crank case, a main shaft rotatably supported in the crank case parallel to the crankshaft and fitted with drive gear groups of a plurality of gear stages, a gear shifting clutch for switching between engagement and disengagement of drive between the crankshaft and the main shaft, and a one way starter clutch interposed between a starter motor and the crankshaft, wherein the gear shifting clutch is fitted on one end of the main shaft, a power transmission gear train including a clutch gear rotating together with an input member of the gear shifting clutch is provided between one end of the crankshaft and the input member, a kick start gear train capable of inputting starting operation force in response to a kick operation to the clutch gear, is arranged between one of the drive gear groups and the clutch gear running along the axial direction of the main shaft, and the one way starter clutch arranged between said one of the drive gear groups and the clutch gear running along the axial direction of the main shaft, is fitted on the crankshaft.