Power Unit System; Outline Of System - Yamaha F150B Service Manual

Power unit system

Outline of system

F150B is equipped with L 4, 4-stroke engine.
The offset crank shaft is used, in which the crankshaft centerline is offset by 10.0 mm (0.39 in) from
the cylinder centerline.
The long intake manifold made from plastic is used for higher intake efficiency to obtain higher out-
put power.
The larger intake silencer is useful to suppress the noise.
e
f
g
a
Oil/gas separator
b
Piston
c
Connecting rod
d
Offset crankshaft
e
Intake manifold
f
Throttle body
g
Intake silencer
Electronic control system / Power unit system
a
Power unit system
b
c
d
2-18
0
1
2
3
4
5
6
7
8
9
10
A