Air Induction System Inspection - Yamaha WR450F(W) Owner's Service Manual

È
a
É
a
Ê
b
b
AIR INDUCTION SYSTEM
INSPECTION
Air induction system
1. Inspect:
• Air induction hose
Crack/damage → Replace.
• Air induction pipe
Crack/damage → Replace.
2. Check:
• Operation of air cut valve
Pass air through the pipe and check the
air cut valve for operation.
Does not meet the following condition →
Replace the air cut valve assembly.
a to b
b to a
a to b
NOTE:
• Blow in air to check for operation.
• When using vacuum, check by the use of the
vacuum/pressure pump gauge set 1.
Vacuum/pressure pump gauge
set:
Vacuum specifying pressure:
CAUTION:
When using vacuum on the pipe c, take
care not to exceed the specified value.
a From air filter
b To cylinder head (exhaust port)
c From cylinder head (intake port)
È Check for induction from air filter.
É Check for prevention of backflow into air filter.
Ê Check for prevention of afterburn.
(When throttle is closed at sudden deceleration)
4 - 23
ENG
Air passes.
Air does not pass.
Air does not pass when
specified pressure is on c.
YB-35956-A/90890-06756
46.7 ~ 86.7 kPa
(350 ~ 650 mmHg,
13.8 ~ 25.6 inHg)