2004 YAMAHA WR 250F check oil

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Page 300 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 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 2004  Manuale de Empleo (in Spanish) 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 318 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 3 - 127
INSP
ADJ
6. Install:
Battery
Battery band
7. Connect:
Battery leads
(to the battery terminals)
CAUTION:
First, connect the positive lead 1,
then the negative lead 2.
8. Check:
Battery term

Page 390 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 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 488 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 163
ENGOIL PUMP
INSPECTION
Oil pump
1. Inspect:
Oil pump drive gear 
1 
Oil pump drive shaft 
2 
Rotor housing 
3 
Oil pump cover 
4 
Cracks/wear/damage 
→ 
Replace.1
32
4
2. Measure:
Tip c

Page 522 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 197
ENGAC MAGNETO AND STARTER CLUTCH
3. Check:
Starter clutch operation
Install the starter clutch drive
gear 
1 onto the starter clutch
2 and hold the starter clutch.
When turning the starter

Page 566 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 241
ENGCRANKCASE AND CRANKSHAFT
2. Check:
Shifter operation
Transmission operation
Unsmooth operation 
→ 
Repair.
3. Install:
Oil strainer 
1 
Bolt (oil strainer) 
2 
T R..10 Nm (1.0 m · kg

Page 568 of 864

YAMAHA WR 250F 2004  Manuale de Empleo (in Spanish) 4 - 243
ENGCRANKCASE AND CRANKSHAFT
6. Tighten:
Hose guide 
1 
Clutch cable holder 
2 
Bolt (crankcase) 
3 
NOTE:Tighten the crankcase tightening
bolts in stage, using a crisscross pat-
tern.
T R..
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