Yamaha WR450FB 2012 Owner's Service Manual page 94

EAS1DX3079
CHECKING THE FUEL LINE
The following procedure applies to all of the fu-
el, vacuum and breather hoses.
1. Remove:
•Seat
• Side cover (left/right)
•Air scoop (left/right)
Refer to "GENERAL CHASSIS" on page 5-
1.
•Fuel tank
Refer to "FUEL TANK" on page 8-1.
2. Check:
• Fuel hose "1"
Cracks/damage
~ Repl~ce.
Loose connection
~.Connect
properly.
3. Install:
•Fuel tank
Refer to "FUEL TANK" on page 8-1.
• Air scoop (left/right)
• Side cover (letvright)
•Seat
Refer to "GENERAL CHASSIS" on page 5-
1.
EAStDX3080
CHEC~NGTHESPARKPLUG
1. Remove:
•Seat
• Side cover (lefVright)
• Air scoop (left/right)
Refer to "GENERAL CHASSIS" on page 5-
1.
•Fuel tank
TIP _ _ _ _ _ _ _ _ _ _ _ _ _ _
Remove the shaft installing the fuel tank in its
rear. Then support the fuel tank using the sup-
plied hook "1" as illustrated. After that, reinstall
the removed shaft.
ECA1DX1001
-----------------------
Do not use too much force to pull the hose
when holding up the fuel tank.
3-6
PERIODIC MAINTENANCE
2. Remove:
• Spark plug cap
•Spark plug
Refer to "CAMSHAFT' on page 6-7.
ECA13330
rw_·~
!U.~~------------
Before removing the spark plug, blow away
any dirt accumulated in the spark plug well
with compressed air to prevent it from fall-
ing into the cylinder.
3. Check:
•Spark plug type
Incorrect
~
Change.
Manufacturer/model
NGK/CASE
4. Check:
•Electrode
Damage/wear
~
Replace the spark plug.
•Insulator
Abnormal color
~
Replace the spark plug.
Normal color is medium-to-light tan.
5. Clean:
•Spark plug
(with a spark plug cleaner or wire brush)
6. Measure:
• Spark plug gap "a"
Out of specification
~
Regap.
A
Spark plug gap
v
~
0.7-0.8
mm
{0.028-0.031
in)
J
t