clock YAMAHA WR 250F 2004 Manuale duso (in Italian)

YAMAHA WR 250F 2004 Manuale duso (in Italian) WR 250F 2004 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52336/w960_52336-0.png YAMAHA WR 250F 2004 Manuale duso (in Italian)

Page 85 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) MAINTENANCE SPECIFICATIONS
2 - 6
SPEC
Stem runout limit ---- 0.01 mm 
(0.0004 in)
Valve seat width IN 0.9 ~ 1.1 mm 
(0.0354 ~ 0.0433 in)1.6 mm 
(0.0630 in)
EX 0.9 ~ 1.1 mm 
(0.0354 ~ 0.0433 in)1.6 mm

Page 212 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 3 - 21
INSP
ADJ
EC350000
ENGINE
COOLANT LEVEL INSPECTION
WARNING
Do not remove the radiator cap 1,
drain bolt and hoses when the
engine and radiator are hot. Scald-
ing hot fluid and steam may be
blow

Page 242 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 3 - 51
INSP
ADJ
3. Remove:
Right radiator
Refer to “RADIATOR” section
in the CHAPTER 4.
Carburetor
Refer to “CARBURETOR”
section in the CHAPTER 4.
Spark plug 
Upper engine bracket
Cylinde

Page 274 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 3 - 83
INSP
ADJ
3. Adjust:
Drive chain slack
DRIVE CHAIN STOPPER 
INSPECTION
1. Inspect:
Drive chain stopper 
1 
Wear indicator groove 
a has
almost disappeared 
→
Replace.
2. Replace:
Drive chai

Page 342 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 4 - 17
ENGRADIATOR
EC456000HANDLING NOTE
WARNING
Do not remove the radiator cap
when the engine and radiator are
hot. Scalding hot fluid and steam
may be blown out under pressure,
which could cause se

Page 384 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 4 - 59
ENGCAMSHAFTS
REMOVAL POINTS
Camshaft
1. Remove:
Timing mark accessing screw
1 
Crankshaft end accessing
screw 
2 
2. Align:
T.D.C. mark
With align mark.
Checking steps:
Turn the crankshaft

Page 390 of 864

YAMAHA WR 250F 2004  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 2004  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 394 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 4 - 69
ENGCAMSHAFTS
3. Turn:
Crankshaft
Counterclockwise several
turns.
4. Check:
Rotor T.D.C. mark
Align with the crankcase align
mark.
Camshaft match marks
Align with the cylinder head
surface.
O

Page 502 of 864

YAMAHA WR 250F 2004  Manuale duso (in Italian) 4 - 177
ENGKICK SHAFT AND SHIFT SHAFT
REMOVAL POINTS
Kick shaft assembly
1. Remove:
Kick shaft assembly 
1 
NOTE:Unhook the torsion spring 
2 from
the hole 
a in the crankcase.
EC4C3101Shift guide an
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