light YAMAHA WR 250F 2005 Manuale duso (in Italian)

YAMAHA WR 250F 2005 Manuale duso (in Italian) WR 250F 2005 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52335/w960_52335-0.png YAMAHA WR 250F 2005 Manuale duso (in Italian)

Page 300 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 3 - 109
INSP
ADJ
2. Attach:
Timing light 
Inductive tachometer 
To the ignition coil lead
(orange lead 
1).
Timing light:
YM-33277-A/
90890-03141
1
3. Adjust:
Engine idling speed
Refer to “ENGINE

Page 302 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 3 - 111
INSP
ADJ
BATTERY INSPECTION AND 
CHARGING
WARNING
Batteries generate explosive
hydrogen gas and contain electro-
lyte which is made of poisonous
and highly caustic sulfuric acid. 
Therefore, a

Page 322 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 3 - 131
INSP
ADJ
REPLACING THE HEADLIGHT 
BULBS
1. Remove:
Headlight
Refer to “SEAT, FUEL TANK
AND SIDE COVERS” section
in the CHAPTER 4.
2. Remove:
Headlight bulb holder cover 
1 
3. Detach:
H

Page 324 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 3 - 133
INSP
ADJELECTRICAL
ADJUSTING THE HEADLIGHT 
BEAMS
1. Adjust:
Headlight beam (vertically)
Adjusting steps:
Turn the adjusting screw 
1 in
direction 
a or 
b.
Direction 
a Headlight beam is 
r

Page 326 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 4 - 1
ENGSEAT, FUEL TANK AND SIDE COVERS
EC400000
ENGINE
SEAT, FUEL TANK AND SIDE COVERS
Extent of removal:
1 Seat removal
2 Fuel tank removal
3 Side covers removal
4 Headlight removal
Extent of remov

Page 368 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 4 - 43
ENGCARBURETOR
9. Install:
Push rod 
1 
NOTE:While holding down the lever 1 
2,
insert the push rod farthest into the
carburetor.
12
10. Install:
Starter jet 
1 
Pilot jet 
2 
Spacer 
3 
Ne

Page 372 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 4 - 47
ENGCARBURETOR
18. Install:
O-ring 
1 
Valve lever housing cover 
2 
Bolt 
(valve lever housing cover) 
3 
19. Install:
Carburetor breather hose 
1 
NOTE:Install the carburetor breather hose

Page 390 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 4 - 65
ENGCAMSHAFTS
Decompression system
1. Check:
Decompression system
Checking steps:
Check that the decompression
mechanism cam 
1 moves
smoothly.
Check that the decompression
mechanism cam leve

Page 392 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 4 - 67
ENGCAMSHAFTS
Fit the timing chain 
3 onto both
camshaft sprockets and install
the camshafts on the cylinder
head.
NOTE:The camshafts should be installed
onto the cylinder head so that the
punc

Page 418 of 864

YAMAHA WR 250F 2005  Manuale duso (in Italian) 4 - 93
ENGVALVES AND VALVE SPRINGS
9. Lap:
Valve face
Valve seat
NOTE:After refacing the valve seat or
replacing the valve and valve guide,
the valve seat and valve face should
be lapped.
Lapping st
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