An engine has a continuously variable transmission in which a drive pulley
is attached to an end of a crankshaft. The drive pulley is coupled by a
flexible transmitter to a driven pulley. The driven pulley is attached to
an end of a transmission shaft. A centrifugal clutch mechanism is axially
aligned with the transmission shaft. The centrifugal clutch is positioned
inboard of the driven pulley. A case supports the crankshaft and the
transmission shaft. The case comprises a first case portion and a second
case portion that are joined along a plane that is positioned between the
driven pulley and a longitudinal plane that intersects an axis of a
cylinder of the engine.