Patent ID: 7730800

Claim:
A power unit, comprising: an engine having a crankcase rotatably supporting a crankshaft; and a transmission for changing a speed of power of the crankshaft, the transmission including: a gearshift shaft disposed in parallel with the crankshaft and rotatably supported in the crankcase; first and second gearshift portions for changing a speed of the power from the crankshaft; a first gearshift clutch transmitting and disconnecting the power relative to the first gearshift portion; a second gearshift clutch transmitting and disconnecting the power relative to the second gearshift portion, the first and second gearshift clutches changing a gearshift position in the first gearshift portion and a gearshift position in the second gearshift portion, wherein the gearshift shaft includes an extending shaft portion extending in a first axial direction from the crankcase accommodating a crank portion of the crankshaft; wherein the first and second gearshift clutches are supported by the extending shaft portion; wherein the extending shaft portion is supported by a bearing portion on a side opposite to the crankcase across the first and second gearshift clutches; and a front connection portion is operatively connected to said first gearshift clutch and a second connection portion is operatively connected to said second gearshift clutch and a centrifugal clutch mounted on the crankshaft for transmitting power to said first and second gearshift clutches.