US 7,540,348 B2
	Power unit for motorcycle and motorcycle
Yousuke Ishida, Shizuoka-ken (Japan); and Akifumi Oishi, Shizuoka-ken (Japan)
Assigned to Yamaha Hatsudoki Kabushiki Kaisha, Shizuoka-ken (Japan)
Filed on Dec. 14, 2005, as Appl. No. 11/300,680.
Claims priority of application No. 2004-361679 (JP), filed on Dec. 14, 2004.
Prior Publication US 2006/0124372 A1, Jun. 15, 2006
Int. Cl. B62K 11/00 (2006.01)

U.S. Cl. 180—228  [280/291]

19 Claims

1. A power unit for a motorcycle, the power unit comprising a case defining a clutch chamber, the case comprising an underside, a plurality of bosses extending downward from the underside of the case, a centrifugal clutch positioned within the clutch chamber and the plurality of bosses being positioned generally below the centrifugal clutch, a first foot rest being positioned to a first lateral side of the case and a second foot rest being position to a second lateral side of the case, the power unit further comprising a second speed changing shaft, the second speed changing shaft being indirectly connected to the centrifugal clutch, a drive sprocket mounted to said second speed changing shaft, a support member disposed generally vertically below the case and positioned such that the support member and the drive sprocket overlap when viewed from above, the support member being connected to the first and second foot rests and being coupled to the plurality of bosses.