YAMAHA WR 250F 2002 Owners Manual

YAMAHA WR 250F 2002 Owners Manual WR 250F 2002 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/52338/w960_52338-0.png YAMAHA WR 250F 2002 Owners Manual
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Page 311 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 21
ENG
ARBRES A CAMES
NOCKENWELLE
ALBERI A CAMME
NOCKENWELLE
ZYLINDERKOPFDECKEL
Demontage-Arbeiten:1 Zylinderkopfdeckel demontieren
Demontage-ArbeitenReihen-
folgeBauteil Anz. Bemerkungen
ZYLINDER

Page 312 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 22
ENGCAMSHAFTS
CAMSHAFTS
Extent of removal:1 Camshaft removal
Extent of removal Order Part name Q’ty Remarks
CAMSHAFTS REMOVAL
1 Timing mark accessing screw 1
Refer to “REMOVAL POINTS”. 2 C

Page 313 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 22
ENG
ARBRES A CAMES
NOCKENWELLE
ALBERI A CAMME
NOCKENWELLE
Demontage-Arbeiten:1 Nockenwellen demontieren
Demontage-ArbeitenReihen-
folgeBauteil Anz. Bemerkungen
NOCKENWELLEN DEMONTIEREN
1 Steuer

Page 314 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 23
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 c

Page 315 of 694

YAMAHA WR 250F 2002  Owners Manual ENG
4 - 23
ARBRES A CAMES
NOCKENWELLE
ALBERI A CAMME
AUSBAU
Nockenwelle
1. Demontieren:
Schwungrad-Abdeckschrau-
be 1 
Rotorzapfen-Abdeckschrau-
be 2 
2. Ausrichten:
Oberer-Totpunkt-Markie-
rung
(m

Page 316 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 24
ENGCAMSHAFTS
5. Remove:
Exhaust camshaft 1 
Intake camshaft 2 
NOTE:
Attach a wire 3 to the timing chain to prevent
it from falling into the crankcase.
INSPECTION
Camshaft
1. Inspect: 
Cam l

Page 317 of 694

YAMAHA WR 250F 2002  Owners Manual ENG
4 - 24
ARBRES A CAMES
NOCKENWELLE
ALBERI A CAMME
5. Demontieren:
Auslaß-Nockenwelle 1 
Einlaß-Nockenwelle 2 
HINWEIS:
Die Steuerkette mit einem Draht 3
sichern, damit sie nicht herabfällt.
PR

Page 318 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 25
ENGCAMSHAFTS
4. Measure:
Camshaft-to-cap clearance 
Out of specification → Measure bearing
diameter (camshaft). 
Camshaft-to-cap clearance:
0.020 ~ 0.054 mm 
(0.0008 ~ 0.0021 in)
<Limit>: 0.

Page 319 of 694

YAMAHA WR 250F 2002  Owners Manual ENG
4 - 25
ARBRES A CAMES
NOCKENWELLE
ALBERI A CAMME
4. Messen:
Nockenwellen-Lagerspiel
Unvorschriftsmäßig → Nok-
kenwellenlagerzapfen-
Durchmesser messen. 
Nockenwellen-Lager-
spiel
0,020–0,05

Page 320 of 694

YAMAHA WR 250F 2002  Owners Manual 4 - 26
ENGCAMSHAFTS
Timing chain tensioner
1. Check:
While pressing the tensioner rod lightly
with fingers, use a thin screwdriver 1
and wind the tensioner rod up fully
clockwise.
When releasing the
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