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Yamaha Wr 450 F Owners Manual

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Page 81

3 - 16
INSP
ADJ
ENGINE OIL REPLACEMENT
6. Idle the engine more than 10 seconds
while keeping the motorcycle upright.
Then stop the engine and add the oil to
the maximum level.
7. Install:
Oil tank cap
ENGINE OIL REPLACEMENT
1. Start the engine and let it warm up for
several minutes.
2. Stop the engine and place an oil pan
under the drain bolt.
3. Remove: 
Oil tank plug 1 
Oil filler cap 2
Drain bolt (with gasket) 3 
Oil filter drain bolt (O-ring) 4 
Drain bolt (with gasket) 5 
Drain bolt (with...

Page 82

3 - 17
INSP
ADJ
ENGINE OIL REPLACEMENT
6. If the oil filter is to be replaced during this
oil change, remove the following parts
and reinstall them.
7. Install:
Plain washer 1 
Oil strainer (frame) 2 
Engine oil hose 3 
Bolt (engine oil hose) 4 
Engine oil hose clamp 5 
Engine skid plate
8. Install:
Gaskets
Oil filter drain bolt
Drain bolt (crankcase rear)
Drain bolt (crankcase left)
Drain bolt (frame)
9. Fill:
Crankcase
10. Install:
Oil filler plug
11. Inspect:
Engine (for oil leaks)
Oil...

Page 83

3 - 18
INSP
ADJ
PILOT SCREW ADJUSTMENT
12. Check:
Oil pressure
Checking steps:
Slightly loosen the oil gallery bolt 1.
Start the engine and keep it idling until oil
starts to seep from the oil gallery bolt. If no
oil comes out after one minute, turn the
engine off so it will not seize.
Check oil passages, oil filter and oil pump
for damage or leakage.
Start the engine after solving the prob-
lem(s) and recheck the oil pressure.
Tighten the oil gallery bolt to specification.
T R..
Oil gallery bolt:...

Page 84

3 - 19
INSP
ADJIDLE SPEED ADJUSTMENT/
VALVE CLEARANCE ADJUSTMENT
EC35M021
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it
up.
2. Adjust:
Idle speed
Adjustment steps:
Adjust the pilot screw.
Refer to “PILOT SCREW ADJUSTMENT”
section.
Turn the throttle stop screw 1 until the
engine runs at the lowest possible speed.
To increase idle speed → 
Turn the throttle stop screw 1 in a.
To decrease idle speed → 
Turn the throttle stop screw 1 out b.
Engine idling speed:
1,700 ~ 1,900 r/min
VALVE...

Page 85

3 - 20
INSP
ADJ
VALVE CLEARANCE ADJUSTMENT
4. Check:
Valve clearance
Out of specification → Adjust. 
Valve clearance (cold):
Intake valve:
0.10 ~ 0.15 mm 
(0.0039 ~ 0.0059 in)
Exhaust valve:
0.20 ~ 0.25 mm 
(0.0079 ~ 0.0098 in)
Checking steps:
Turn the crankshaft counterclockwise with
a wrench.
Align the T.D.C. mark a on the rotor with
the align mark b on the crankcase cover
when piston is at T.D.C. on compression
stroke.
NOTE:
In order to be sure that the piston is at Top
Dead Center, the punch mark...

Page 86

 
3 - 21
INSP
ADJ
 
VALVE CLEARANCE ADJUSTMENT 
5. Adjust: 
 
Valve clearance  
Adjustment steps: 
 
Loosen the timing chain tensioner cap
bolt. 
 
Remove the timing chain tensioner and
camshaft caps.
NOTE:
 
Remove the camshaft cap bolts in a criss-
cross pattern from the outside working 
inwards. 
 
Remove the camshaft (exhaust   
1  
 and
intake   
2  
).
NOTE:
 
Attach a wire   
3  
 to the timing chain to pre- 
vent it from falling into the crankcase. 
 
Remove the valve lifters   
4  
 and the...

Page 87

 
3 - 22
INSP
ADJ
 
 
Round off the last digit of the installed pad
number to the nearest increment.  
Last digit of pad 
numberRounded value
0, 1 or 2 0
4, 5 or 6 5
8 or 9 10
EXAMPLE:  
Installed pad number = 148
Rounded off value = 150
NOTE:
 
Pads can only be selected in 0.05 mm incre- 
ments. 
 
Locate the rounded-off value and the
measured valve clearance in the chart
“PAD SELECTION TABLE”. The field
where these two coordinates intersect
shows the new pad number to use.
NOTE:
 
Use the new pad...

Page 88

 
3 - 23
INSP
ADJ
 
6. Install: 
 
All removed parts
NOTE:
 
Install all removed parts in reversed order of 
their removal. Note the following points. 
 
Install the timing chain tensioner.
Refer to “CAMSHAFTS” section in the
CHAPTER 4.
NOTE:
 
Turn the crankshaft counterclockwise sev-
eral turns so that the installed parts settle 
into the right position. 
 
Recheck the valve clearance. 
 
If the clearance is still incorrect, repeat all
the clearance adjustment steps until the
specified clearance is...

Page 89

 
3 - 24
INSP
ADJ
 
VALVE CLEARANCE ADJUSTMENT 
INTAKE 
MEASURED 
CLEARANCEINSTALLED PAD NUMBER
120 125 130 135 140 145 150 155 160 165 170
175 180 185 190 195 200 205 210 215 220 225 230 235 240
0.00 ~ 0.04 120 125 130 135 140 145 150 155
160165 170 175 180 185 190 195 200 205 210 215 220 225 230
0.05 ~ 0.09
120 125 130 135 140 145 150 155 160 165170 175 180 185 190 195 200 205 210 215 220 225 230 235
0.10 ~ 0.15
STANDARD CLEARANCE
0.16 ~ 0.20125130135140145150155160165170175180 185 190 195 200 205 210...

Page 90

 
3 - 25
INSP
ADJ
 
SPARK ARRESTER CLEANING (For USA)
WARNING
 
 
Be sure the exhaust pipe and muffler are
cool before cleaning the spark arrester. 
 
Do not start the engine when cleaning the 
exhaust system. 
1. Remove: 
 
Bolt (spark arrester)  
1  
 
1
1
 
2. Remove: 
 
Spark arrester  
1 
 
Pull the spark arrester out of the muf-
fler.
1
 
3. Clean: 
 
Spark arrester
Tap the spark arrester lightly, then use
a wire brush to remove any carbon
deposits.
4. Install: 
 
Spark arrester
Insert the...
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