2002 YAMAHA WR 250F oil

SPEC
2 - 17
MAINTENANCE SPECIFICATIONS
EC212300
ELECTRICAL
Item Standard Limit
Ignition system:
Advancer type Electrical ----
CDI:
Magneto-model (stator)/manufac-
turer5NG-50/YAMAHA----
Charging coil 1 resistance (color) 640 ~ 960 Ω at 20 ˚C (68 ˚F)
(Green – Brown)----
Charging coil 2 resistance (color) 464 ~ 696 Ω at 20 ˚C (68 ˚F)
(Green – Pink)----
Lighting coil resistance (color) 0.16 ~ 0.24 Ω at 20 ˚C (68 ˚F)
(Black – Yellow)----
Pickup coil resistance (color) 248 ~ 372 Ω at 20 ˚C (68 ˚F)
(White – Red)----
CDI unit-model/manufacturer 5PH-50/YAMAHA
(For USA)
5PH-60/YAMAHA
(For EUROPE)
5PH-80/YAMAHA
(For CDN, AUS, NZ and ZA)----
----
----
Ignition coil:
Model/manufacturer 4SR-00/YAMAHA ----
Minimum spark gap 6 mm (0.24 in) ----
Primary coil resistance 0.20 ~ 0.30 Ω at 20 ˚C (68 ˚F) ----
Secondary coil resistance 9.5 ~ 14.3 kΩ at 20 ˚C (68 ˚F) ----
Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
Stator M6 × 1.0 3 10 1.0 7.2
Rotor M10 × 1.25 1 48 4.8 35
Neutral switch M5 × 0.8 2 4 0.4 2.9
Ignition coil M6 × 1.0 2 7 0.7 5.1

2 - 4
SPEC

CARACTERISTIQUES D’ENTRETIEN
MOTEUR
Article Standard Limite
Culasse:
Limite de déformation ---- 0,05 mm
(0,002 in)
Cylindre:
Alésage 77,00 à 77,01 mm
(3,0315 à 3,0319 in)----
Limite d’ovalisation ---- 0,05 mm
(0,002 in)
Arbre à cames:
Méthode d’entraînement Transmission par chaîne (gauche) ----
Diamètre intérieur de chapeau 22,000 à 22,021 mm
(0,8661 à 0,8670 in)----
Diamètre extérieur d’arbre à cames 21,967 à 21,980 mm
(0,8648 à 0,8654 in)----
Jeu entre arbre à cames et chapeau 0,020 à 0,054 mm
(0,0008 à 0,0021 in)0,08 mm
(0,003 in)
Dimensions de came
Admission“A”30,296 à 30,346 mm
(1,1923 à 1,1947 in)30,196 mm
(1,1888 in)
“B”22,45 à 22,55 mm
(0,8839 à 0,8878 in)22,35 mm
(0,8799 in)
Echappement“A”30,399 à 30,499 mm
(1,1968 à 1,2007 in)30,299 mm
(1,1929 in)
“B”22,45 à 22,55 mm
(0,8839 à 0,8878 in)22,35 mm
(0,8799 in)
Limite de voile d’arbre à cames ---- 0,03 mm
(0,0012 in)
A
B

CARACTERISTIQUES D’ENTRETIEN

2 - 13
SPEC
Article Standard Limite
Roue: USA, CDN, ZA EUROPE, AUS, NZ
Type de roue avant Roue à rayons←----
Type de roue arrière Roue à rayons←----
Taille/matériau de jante avant 21 × 1,60/aluminum←----
Taille/matériau de jante arrière 18 × 1,85/aluminum 18 × 2,15/aluminum ----
Limite de voile de jante:
Radial ---- ---- 2,0 mm
(0,08 in)
Latéral ---- ---- 2,0 mm
(0,08 in)
Chaîne de transmission:
Type/fabricant DID520VM/DAIDO ----
Nombre de maillons 113 maillons + attache ----
Flèche de la chaîne 40 à 50 mm (1,6 à 2,0 in) ----
Longueur de chaîne (10 maillons) ---- 150,1 mm
(5,91 in)
Frein à disque avant:
Diamètre extérieur × épaisseur 250 × 3,0 mm (9,84 × 0,12 in) 250 × 2,5 mm
(9,84 × 0,10 in)
Epaisseur de plaquette 4,4 mm (0,17 in) 1,0 mm
(0,04 in)
Diamètre intérieur de maître-cylindre 11,0 mm (0,433 in) ----
Diamètre intérieur de cylindre d’étrier 27,0 mm (1,063 in) × 2 ----
Type de liquide de frein DOT n˚4 ----
Frein à disque arrière:
Diamètre extérieur × épaisseur 245 × 4,0 mm (9,65 × 0,16 in) 245 × 3,5 mm
(9,65 × 0,14 in)
Limite de flèche ---- 0,15 mm
(0,006 in)
Epaisseur de plaquette 6,4 mm (0,25 in) 1,0 mm
(0,04 in)
Diamètre intérieur de maître-cylindre 12,7 mm (0,500 in) ----
Diamètre intérieur de cylindre d’étrier 27,0 mm (1,063 in) × 1 ----
Type de liquide de frein DOT n˚4 ----
Levier de frein et pédale de frein:
Position du levier de frein 95 mm (3,74 in) ----
Hauteur de la pédale de frein
(hauteur en dessous du sommet du
repose-pied)5 mm (0,20 in) ----
Jeu de levier d’embrayage (au pivot du
levier)8 à 13 mm (0,31 à 0,51 in) ----
Jeu à la poignée d’accélération 3 à 5 mm (0,12 à 0,20 in) ----
CARACTERISTIQUES D’ENTRETIEN

2 - 19
SPEC

CABLE ROUTING DIAGRAM
EC240000
CABLE ROUTING DIAGRAM
1
Hose guide
2
Brake hose
3
Voltage regulator
4
Light switch lead
5
Fuel tank breather hose
6
Engine stop switch lead
7
Clamp
8
Oil tank breather hose
9
Sub-wire harness
0
Taillight lead
A
Throttle position sensor lead
B
Neutral switch lead
C
Oil hose
D
Cylinder head breather hose
E
CDI magneto lead
F
Clutch cable
G
Cable guide
H
Carburetor breather hose
I
Carburetor overflow hose
J
Coolant reservoir breather hose
K
Decompression cable
L
Ground lead
M
Ignition coil lead
N
CDI unit lead
O
Voltage regulator lead
Å
Pass the fuel tank breather hose
behind handlebar, then insert it
into the steering stem hole.
ı
Pass the decompression cable,
engine stop switch lead and light
switch lead under where the oil
hose is attached.
Ç
Pass the voltage regulator lead,
engine stop switch lead and light
switch lead over the radiator
hose.
Î
Fasten the engine stop switch
lead, light switch lead and igni-
tion coil lead of the sub-wire har-
ness.
‰
Fasten the sub-wire harness
and engine stop switch lead.
Ï
Pass the cylinder head breather
hose along the right side of the
oil tank breather hose.
Ì
Fasten the sub-wire harness
and light switch lead in front of
the upper engine brackets.
Ó
Fasten the sub-wire harness.
È
Pass the sub-wire harness
between the upper engine
brackets.
Ô
Fasten the sub-wire harness.

Fasten the throttle position sen-
sor lead.

2 - 20
SPEC

CABLE ROUTING DIAGRAM
Ò
Make sure that the throttle
position sensor lead coupler
does not go outside the chas-
sis.
˜
Pass the carburetor breather
hoses and overflow hose
between the connecting rod
and cross tube (frame).
ˆ
Fasten the neutral switch lead
on the oil hose with a plastic
locking tie and cut off the tie
end.
Ø
Pass the cylinder head
breather hose through the hose
guide.
∏
Pass the clutch cable through
the cable guide.
Œ
Fasten the neutral switch lead
and CDI magneto lead.
Â
Pass the clutch cable along the
inner side of the cylinder head
breather hose.
Í
Pass the cylinder head
breather hose along the inner
side of the radiator hose.
Ê
Pass the clutch cable in front of
the radiator mounting boss.
Ë
Fit the brake hose into the
guides on the protector.
◊
Pass the neutral switch lead
and CDI magneto lead through
the cable guide.
„
Fasten the ground lead
together with the ignition coil
lead.
Ù
Do not allow the light switch
lead to slacken between the
two clamps.
Á
Pass the decompression cable
along the right side of the cylin-
der head breather hose.
Û
Pass the clutch cable through
the cable guides.
Pass the carburetor breather
hoses, overflow hose and
coolant reservoir breather
hose so that all there hoses
do not contact the rear shock
absorber.
Position each lead at the
lower left of the main tube
(frame).
AA
AB

2 - 21
SPEC

1
Coolant reservoir breather hose
2
Radiator breather hose
3Ignition coil
4CDI unit
5CDI unit band
6Throttle cable (return)
7Throttle cable (pull)
8Cable guide
9CDI unit lead
0Spark plug lead
ACDI unit stayÅFasten the coolant reservoir breather hose and
carburetor breather hoses together.
ıPass the throttle cables along inner side of the
spark plug lead.
ÇPass the CDI unit lead between the radiator hose
and radiator mounting boss.
ÎPass the throttle cables through the cable guides.
‰Insert the CDI unit band over the CDI unit stay
(frame) as far as possible.
CABLE ROUTING DIAGRAM

3 - 1
INSP
ADJ

MAINTENANCE INTERVALS
EC300000
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS
The following schedule is intended as a general guide to maintenance and lubrication. Bear in mind
that such factors as weather, terrain, geographical location, and individual usage will alter the
required maintenance and lubrication intervals. If you are a doubt as to what intervals to follow in
maintaining and lubricating your machine, consult your Yamaha dealer.
ItemAfter
break-inEvery
race
Every
third race
or
500 km
(300 mi)Every
fifth race
or
1,000 km
(600 mi)
As re-
quiredRemarks
ENGINE OIL
Replace
Inspect
●

●●

●
OIL FILTER ELEMENT, OIL STRAINER
Clean
●

VALVES
Check the valve clearances.
Inspect
Replace
●

●

●

●
The engine must be cold.
Check the valve seats
and valve stems for wear.
VALVE SPRINGS
Inspect
Replace
●

●
Check the free length and
the tilt.
VALVE LIFTERS
Inspect
Replace
●

●
Check for scratches and
wear.
CAMSHAFTS
Inspect
Replace
●

●
Inspect the camshaft sur-
face.
TIMING CHAIN SPROCKETS, TIMING
CHAIN
Inspect
Replace
●

●
Check for wear on the
teeth and for damage.
PISTON
Inspect
Clean
Replace
●

●

●

●
Inspect crack
Remove carbon
PISTON RING
Inspect
Replace
●

●

●
Check ring end gap
PISTON PIN
Inspect
Replace
●

●

CYLINDER HEAD
Inspect and clean
●
Remove carbon
Change gasket
CYLINDER
Inspect and clean
Replace
●

●
Inspect score marks
Inspect wear
CLUTCH
Inspect and adjust
Replace
●

●

●
Inspect housing, friction
plate, clutch plate and
spring
TRANSMISSION
Inspect
Replace bearing
●

●

3 - 2
INSP
ADJ

MAINTENANCE INTERVALS
SHIFT FORK, SHIFT CAM, GUIDE BAR
Inspect
●
Inspect wear
ROTOR NUT
Retighten
●

●

EXHAUST PIPE, SILENCER, PRO-
TECTOR
Inspect and retighten
Clean
Replace
●

●

●

●
* Whichever comes first
*SPARK ARRESTER
Clean
(Every six
months)
●
CRANK
Inspect and clean
●

●

CARBURETOR
Inspect, adjust and clean
●

●
When using a high-pres-
sure washer, make sure
that water does not enter
the accelerator pump.
SPARK PLUG
Inspect and clean
Replace
●

●

●

DRIVE CHAIN
Lubricate, slack, alignment
Replace
●

●

●
Use chain lube
Chain slack: 40 ~ 50 mm
(1.6 ~ 2.0 in)
COOLING SYSTEM
Check coolant level and leakage
Check radiator cap operation
Replace coolant
Inspect hoses
●

●

●

●

●
Every two years
OUTSIDE NUTS AND BOLTS
Retighten
●

●
Refer to “STARTING
AND BREAK-IN” section
in the CHAPTER 1.
AIR FILTER
Clean and lubricate
Replace
●

●

●
Use foam air-filter oil
FRAME
Clean and inspect
●

●

FUEL TANK, COCK
Clean and inspect
●

●

BRAKES
Adjust lever position and pedal height
Lubricate pivot point
Check brake disc surface
Check fluid level and leakage
Retighten brake disc bolts, caliper
bolts, master cylinder bolts and union
bolts
Replace pads
Replace brake fluid
●

●

●

●

●

●

●

●

●

●

●

●
Every one year
FRONT FORKS
Inspect and adjust
Replace oil
Replace oil seal
●

●

●

●

●
Suspension oil “01” ItemAfter
break-inEvery
race
Every
third race
or
500 km
(300 mi)Every
fifth race
or
1,000 km
(600 mi)
As re-
quiredRemarks


3