Power unit system
2-16
Power unit system
Overview
This model uses a 4-stroke L4 engine. With the
same engine displacement as the larger mod-
els, this engine produces higher torque than
other models in
the same class. The SOHC
valve system has been adopted to make this
engine compact and lightweight.
Cylinder block
This model employs an offset cylinder, which
has an offset “a” between the center points of
the crankshaft and cylinder.
An over-sized piston (0.25 mm (0.0098 in)) that
matches this
engine is available.
Flywheel and crankshaft
This model uses the flange mount “a” type fly-
wheel “1”.
The crankshaft “2” is formed as a one-piece
casting with integrated drive sprocket “b”
and
the flywheel mounting flange “c”, improving
serviceability and reliability of the valve train.
Vapor separator
The vapor separator “1” is located at the opti-
mum position where it is accessible during
maintenance and
less susceptible to engine
heat.
The lightweight vapor separator cover “2” is
made of resin.
a
1
a
c
b
2
1
2
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