Patent ID: 8011477

Claim:
A motorcycle power unit comprising: an internal combustion engine having an oil pan connected to a lower portion of a crank case that rotatably supports a crank shaft; and a continuously variable transmission that continuously varies rotational power of the crank shaft to transmit the resultant rotational power to a rear wheel side, wherein a crank chamber that contains the crank shaft is formed in the crank case; a continuously variable transmission chamber that contains the continuously variable transmission is formed of the crank case and of a cover member connected to the crank case; the oil pan has a division wall for dividing an interior of the oil pan into an internal combustion engine side oil reservoir that reserves oil for each lubrication portion of the internal combustion engine, and a continuously variable transmission side oil reservoir that reserves oil for lubrication of the continuously variable transmission and for speed control thereof, said division wall being connected to the lower portion of the crank case; the continuously variable transmission chamber liquid-tightly isolated from the crank chamber is communicated with the continuously variable transmission side oil reservoir; and the continuously variable transmission side oil reservoir is formed wherein part of the continuously variable transmission side oil reservoir expands more outwardly than the continuously variable transmission chamber in a width direction of the motorcycle.