Yamaha WaveRunner FX Cruiser SHO, Service Manual

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GEN
INFO
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Air filter case and air filter element
The air filter case and air filter element have been newly designed to handle the increased intake air
volume. The air filter element itself is made of water-repellent material, which prevents water from
entering the engine. In addition, the air filter element is secured to the air filter case cover using
screws.
1 Screw
2 Air filter element
3 Air filter case cover
Supercharger assembly
The supercharger is located on the front of the engine, and is a centrifugal type that rotates the
impeller for supercharging. The impeller uses a step-up gear with 2 steps to transmit the rotation of
the crankshaft. The impeller rotates about 10 times faster than the crankshaft. The impeller drive
gear is equipped with a one-way clutch; therefore, even if the engine stops when the impeller is
rotating at high speed, the structure of the impeller allows it alone to continue rotating. The super-
charger has excellent durability and is very quiet. In addition, the supercharger is easy to service.
1
Impeller
2
Gear
3
One-way clutch
1
3 2
1
2
3
DRIVEN GEAR
>>>Number of teeth:
16
50
19
IDLE GEAR
>>>Number of teeth
BIG:
SMALL:
EXAMPLE:
Turbine r/min
Trolling speed: 9.86
×
1,250
=
12,325 r/min
=
(60/19)
×
(50/16)
×
Engine r/min
=
3.16
×
3.12
×
Engine r/min
=
9.86
×
Engine r/min
DRIVE GEAR ASSEMBLY
>>>Number of teeth:
60
Feature and benefit