Yamaha Wr250r 2008 Manual

 
CHAIN DRIVE 
4-61 
c. Remove the drive chain from the kerosene
and completely dry it.
CAUTION:
 
 ECA14290 
 
This motorcycle has a drive chain with
small rubber O-rings “1” between the drive
chain side plates. Never use high-pressure
water or air, steam, gasoline, certain sol-
vents (e.g., benzine), or a coarse brush to
clean the drive chain. High-pressure meth-
ods could force dirt or water into the drive
chain’s internals, and solvents will deterio-
rate the O-rings. A coarse brush can also
damage...

 
CHAIN DRIVE 
4-62
NOTE:
 
 
While applying the rear brake, tighten the drive
sprocket nut. 
 
Stake the nut “1”.
5. Adjust: 
 
Drive chain slack
Refer to “ADJUSTING THE DRIVE CHAIN
SLACK” on page 1-26.
CAUTION:
 
 ECA13550 
A drive chain that is too tight will overload
the engine and other vital parts, and one that
is too loose can skip and damage the swing-
arm or cause an accident. Therefore, keep
the drive chain slack within the specified lim- 
its.Drive chain slack
WR250R 38.0 
– 
48.0 mm 
(1.50...

 
1
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3
4
5
6
7
8
9
 
ENGINE 
ENGINE REMOVAL .......................................................................................5-1  
INSTALLING THE ENGINE .....................................................................5-5
INSTALLING THE SHIFT PEDAL ............................................................5-5  
CAMSHAFT....................................................................................................5-6  
REMOVING THE CAMSHAFT...

 
SHIFT SHAFT ................................................................................................5-43 
CHECKING THE SHIFT SHAFT ..............................................................5-44
CHECKING THE STOPPER LEVER .......................................................5-44
INSTALLING THE SHIFT SHAFT ............................................................5-44 
OIL PUMP AND BALANCER GEAR .............................................................5-45 
REMOVING THE OIL PUMP...

 
ENGINE REMOVAL 
5-1 
EAS23710 
ENGINE REMOVAL 
Removing the exhaust pipe
Order Job/Parts to remove Q’ty Remarks 
Seat side cover (left/right) Refer to“GENERAL CHASSIS” on page 4-1.
Air scoop (left/right) Refer to“GENERAL CHASSIS” on page 4-1.
1 Muffler protector 1
2 EXUP pulley cover 1
3 Side cover right stay 1
4 EXUP cable 2
5 Muffler 1
6 Exhaust pipe 1
7 Exhaust pipe gasket 1
8 Muffler gasket 1
For installation, reverse the removal proce-
dure.
23
4 5
67
8
1
T R..7 Nm (0.7 m • kg, 5.1 ft • Ib) 
T R..10...

 
ENGINE REMOVAL 
5-2 
Removing the shift pedal, leads and hoses
Order Job/Parts to remove Q’ty Remarks  
CoolantDrain.
Refer to“CHANGING THE COOLANT” on 
page 3-18.
Radiator Refer to“RADIATOR” on page 6-1.
Starter motor Refer to“STARTER MOTOR” on page 5-30.
1 Shift pedal 1
2 Drive sprocket cover 1
3 Gasket 1
4 Drive sprocket nut 1
5 Drive sprocket 1
6 Speed sensor coupler 1 Disconnect.
7 Coolant temperature sensor coupler 1 Disconnect.
8 Generator coupler 2 Disconnect.
9 Crankshaft position sensor...

 
ENGINE REMOVAL 
5-3 
For installation, reverse the removal proce-
dure.  
Removing the shift pedal, leads and hoses
Order Job/Parts to remove Q’ty Remarks
95 Nm (9.5 m • kg, 69 ft • Ib) 
12 3
4 56 7
8
910 11
121513
14
T R..10 Nm (1.0 m • kg, 7.2 ft • Ib) T R..18 Nm (1.8 m • kg, 13 ft • Ib) 
T R..
T R..10 Nm (1.0 m • kg, 7.2 ft • Ib)  

 
ENGINE REMOVAL 
5-4 
Order Job/Parts to remove Q’ty Remarks
NOTE:
 
Use a suitable stand to supported the 
engine side. 
Engine oilDrain.
Refer to“CHANGING THE ENGINE OIL” on 
page 3-11.
1 Engine mounting bolt (front upper) 1
2 Engine mounting bolt (front) 1
3 Engine mounting bolt (front lower) 1
4 Down tube bolts (front upper) 2
5 Down tube bolts (rear lower) 2
6 Down tube 1
7 Pivot shaft 1
8 Engine assembly 1
For installation, reverse the removal proce-
dure.
1
2
3 4
5
67
8
T R..85 Nm (8.5 m • kg, 62...

 
ENGINE REMOVAL 
5-5 
EAS23720 
INSTALLING THE ENGINE 
1. Install: 
 
Engine assembly “1” 
 
Pivot shaft “2” 
 
Down tube “3” 
 
Down tube bolt (rear lower side) “4” 
 
Down tube bolt (front upper side) “5” 
 
Engine mounting bolt (front lower side) “6” 
 
Engine mounting bolt (front) “7” 
 
Engine mounting bolt (front upper side) “8”
NOTE:
 
Do not fully tighten the bolts. (Temporarily tight- 
en)
2. Tighten: 
 
Pivot shaft nut 
 
Downtube nut (rear lower side) 
 
Engine mounting nut...

 
CAMSHAFT 
5-6 
EAS23730 
CAMSHAFT 
Removing the cylinder head cover
Order Job/Parts to remove Q’ty Remarks  
Side cover (left/right)Refer to “GENERAL CHASSIS” on page 
4-1.
Fuel tank Refer to “FUEL TANK” on page 7-1.
CoolantDrain.
Refer to “CHANGING THE COOLANT” on 
page 3-18.
Engine oilDrain.
Refer to “CHANGING THE ENGINE OIL” on 
page 3-11.
1 Throttle cable 2
2 Throttle body 1
3 Clutch cable 1 Disconnect.
4 Ignition coil coupler 1 Disconnect.
5 Cylinder head cover breather hose 1
6 Ignition coil...