2005 YAMAHA WR 250F height

GENERAL SPECIFICATIONS
2 - 1
SPEC
EC200000
SPECIFICATIONS
EC211000
GENERAL SPECIFICATIONS
Model name: WR250FT (USA, CDN, AUS, NZ)
WR250F (EUROPE, ZA)
Model code number: 5UM8 (USA)
5UM9 (EUROPE)
5UMA (CDN, AUS, NZ, ZA)
Dimensions: USA, ZA, CDN EUROPE, AUS, NZ
Overall length 2,190 mm (86.22 in) 2,180 mm (85.83 in)
Overall width 830 mm (32.68 in)←
Overall height 1,290 mm (50.79 in) 1,295 mm (50.98 in)
Seat height 985 mm (38.78 in) 990 mm (38.98 in)
Wheelbase 1,470 mm (57.87 in)←
Minimum ground clearance 370 mm (14.57 in) 375 mm (14.76 in)
Dry weight:
Without oil and fuel 105.5 kg (232.6 lb)
Engine:
Engine type Liquid cooled 4-stroke, DOHC
Cylinder arrangement Single cylinder, forward inclined
Displacement 249 cm
3 (8.76 Imp oz, 8.42 US oz)
Bore × stroke 77.0 × 53.6 mm (3.03 × 2.11 in)
Compression ratio 12.5 : 1
Kick and electric starter
Starting system
Lubrication system: Dry sump
Oil type or grade:
Engine oil (For USA and CDN)
At 5 °C (40 °F) or higher È
Yamalube 4 (20W-40) or SAE 20W-40 type
SG motor oil
(Non-Friction modified)
At 15 °C (60 °F) or lower É
Yamalube 4 (10W-30) or SAE 10W-30 type
SG motor oil
(Non-Friction modified)
and/or
Yamalube 4-R (15W-50)
(Non-Friction modified)
(Except for USA and CDN)
API “SG” or higher grade
-20
-4-10
140
3010
5020
6830
8640 50
104
122˚CTemp.
˚F
10W-30
10W-40
20W-40
20W-50
15W-40
2

MAINTENANCE SPECIFICATIONS
2 - 8
SPEC
Clutch:
Friction plate thickness 2.9 ~ 3.1 mm (0.114 ~ 0.122 in) 2.7 mm
(0.106 in)
Quantity 9 ----
Clutch plate thickness 1.1 ~ 1.3 mm (0.043 ~ 0.051 in) ----
Quantity 8 ----
Warp limit ---- 0.1 mm
(0.004 in)
Clutch spring free length 37.0 mm (1.46 in) 36.0 mm
(1.42 in)
Quantity 5 ----
Clutch housing thrust clearance 0.10 ~ 0.35 mm
(0.0039 ~ 0.0138 in)----
Clutch housing radial clearance 0.010 ~ 0.044 mm
(0.0004 ~ 0.0017 in)----
Clutch release method Inner push, cam push ----
Shifter:
Shifter type Cam drum and guide bar ----
Guide bar bending limit ---- 0.05 mm
(0.002 in)
Kickstarter:
Type Kick and ratchet type ----
Carburetor:
Type/manufacturer FCR-MX37/KEIHIN
I. D. mark 5UM8 80
Main jet (M.J) #168
Main air jet (M.A.J)ø2.0
Jet needle (J.N) OBERP-5
Cutaway (C.A) 1.5
Pilot jet (P.J) #40
Pilot air jet (P.A.J) #70
Pilot outlet (P.O)ø0.9
Pilot screw (example) (P.S) 1-3/4
Bypass (B.P)ø1.0
Valve seat size (V.S)ø3.8
Starter jet (G.S) #72
Leak jet (Acc.P) #95
Float height (F.H) 8 mm (0.31 in)
Engine idle speed 1,900 ~ 2,100 r/min
Intake vacuum 29.3 ~ 34.7 kPa
(220 ~ 260 mmHg,
8.66 ~ 10.24 inHg)
Hot starter lever free play 3 ~ 6 mm
(0.12 ~ 0.24 in) Item Standard Limit

MAINTENANCE SPECIFICATIONS
2 - 9
SPEC
Lubrication system:
Oil filter type Paper type ----
Oil pump type Trochoid type ----
Tip clearance 0.12 mm or less
(0.0047 in or less)0.20 mm
(0.008 in)
Side clearance 0.09 ~ 0.17 mm
(0.0035 ~ 0.0067 in)0.24 mm
(0.009 in)
Housing and rotor clearance 0.03 ~ 0.10 mm
(0.0012 ~ 0.0039 in)0.17 mm
(0.0067 in)
Cooling:
Radiator core size
Width 107.8 mm (4.2 in) ----
Height 220 mm (8.7 in) ----
Thickness 32 mm (1.26 in) ----
Radiator cap opening pressure 110 kPa (1.1 kg/cm
2, 15.6 psi) ----
Radiator capacity (total) 0.56 L (0.49 Imp qt, 0.59 US qt) ----
Water pump
Type Single-suction centrifugal pump ----Item Standard Limit

MAINTENANCE SPECIFICATIONS
2 - 13
SPEC
Wheel: USA, CDN, ZA EUROPE, AUS, NZ
Front wheel type Spoke wheel← ----
Rear wheel type Spoke wheel← ----
Front rim size/material 21 × 1.60/Aluminum← ----
Rear rim size/material 18 × 1.85/Aluminum 18 × 2.15/Aluminum ----
Rim runout limit:
Radial ---- ---- 2.0 mm
(0.08 in)
Lateral ---- ---- 2.0 mm
(0.08 in)
Drive chain:
Type/manufacturer DID520VM/DAIDO ----
Number of links 113 links + joint ----
Chain slack 48 ~ 58 mm (1.9 ~ 2.3 in) ----
Chain length (15 links) ---- 239.3 mm
(9.42 in)
Front disc brake:
Disc outside dia. × Thickness 250 × 3.0 mm (9.84 × 0.12 in)
250 × 2.5 mm
(9.84 × 0.10 in)
Pad thickness 4.4 mm (0.17 in) 1.0 mm
(0.04 in)
Master cylinder inside dia. 11.0 mm (0.433 in) ----
Caliper cylinder inside dia. 27.0 mm (1.063 in) × 2 ----
Brake fluid type DOT #4 ----
Rear disc brake:
Disc outside dia. × Thickness 245 × 4.0 mm (9.65 × 0.16 in)
245 × 3.5 mm
(9.65 × 0.14 in)
Deflection limit ---- 0.15 mm
(0.006 in)
Pad thickness 6.4 mm (0.25 in) 1.0 mm
(0.04 in)
Master cylinder inside dia. 11.0 mm (0.433 in) ----
Caliper cylinder inside dia. 25.4 mm (1.000 in) × 1 ----
Brake fluid type DOT #4 ----
Brake lever and brake pedal:
Brake lever position 95 mm (3.74 in) ----
Brake pedal height
(vertical height above footrest top)5 mm (0.20 in) ----
Clutch lever free play (lever end) 8 ~ 13 mm (0.31 ~ 0.51 in) ----
Throttle grip free play 3 ~ 5 mm (0.12 ~ 0.20 in) ----Item Standard Limit

3 - 2
INSP
ADJ
MAINTENANCE INTERVALS
ROTOR NUT
Retighten
EXHAUST PIPE, SILENCER,
PROTECTOR
Inspect and retighten
Clean
Replace* Whichever comes first
*SPARK ARRESTER
Clean
(Every
six
months)
CRANK
Inspect and clean
CARBURETOR
Inspect, adjust and clean
SPARK PLUG
Inspect and clean
Replace
DRIVE CHAINUse chain lube
Chain slack:
48 ~ 58 mm (1.9 ~ 2.3 in) Lubricate, slack, alignment
Replace
COOLING SYSTEM
Check coolant level and leakage
Check radiator cap operation
Replace coolantEvery two years
Inspect hoses
OUTSIDE NUTS AND BOLTS Refer to “STARTING AND
BREAK-IN” section in the
CHAPTER 1. Retighten
AIR FILTER
Clean and lubricate Use foam air-filter oil or
equivalent oil
Replace
OIL FILTER
Replace
OIL STRAINER (frame)
Clean
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 yearItemAfter
break-inEvery
race
Every third
(or
500 km)Every fifth
(or
1,000 km)As
requiredRemarks
1
2
3
4
5
6
7

3 - 69
INSP
ADJ
EC364002REAR BRAKE ADJUSTMENT
1. Check:
Brake pedal height
a
Out of specification
→ Adjust.
2. Adjust:
Brake pedal height
Brake pedal height a:
5 mm (0.20 in)
Pedal height adjustment steps:
Loosen the locknut
1.
Turn the adjusting nut
2 until
the pedal height
a is within
specified height.
Tighten the locknut.
WARNING
Adjust the pedal height
between the maximum È and
the minimum É as shown. (In
this adjustment, the bolt 3
end b should protrude out of
the threaded portion 4 but
not be less than 2 mm
(0.08 in) c away from the
brake pedal 5).
After the pedal height adjust-
ment, make sure that the rear
brake does not drag.
ÈÉ
FRONT BRAKE PAD INSPECTION
AND REPLACEMENT
1. Inspect:
Brake pad thickness
a
Out of specification
→
Replace as a set.
Brake pad thickness:
4.4 mm (0.17 in)
:
1.0 mm (0.04 in)
2. Replace:
Brake pad
Brake pad replacement steps:
Remove the pad pin plug
1.
REGLAGE DU FREIN ARRIERE
1. Contrôler:
Hauteur de la pédale de frein a
Hors spécifications → Ajuster.
2. Régler:
Hauteur de la pédale de frein
Hauteur de la pédale de
frein a:
5 mm (0,20 in)
Étapes du réglage de la hauteur de
la pédale de frein:
Desserrer le contre-écrou 1.
Faire tourner l’écrou de réglage 2
jusqu’à ce que la hauteur de la
pédale a soit conforme aux spéci-
fications.
Serrer le contre-écrou.
AVERTISSEMENT
Régler la hauteur de la pédale
entre le maximum È et le mini-
mum É comme illustré. (Dans ce
réglage, l’extrémité b du boulon
3 doit dépasser de la partie file-
tée 4 mais ne doit pas être dis-
tante de moins de 2 mm (0,08 in)
c de la pédale de frein 5).
Après le réglage de la hauteur de
la pédale de frein, contrôler que
le frein arrière ne frotte pas.
CONTROLE ET REMPLACEMENT
DES PLAQUETTES DE FREIN
AVANT
1. Contrôler:
Epaisseur de la plaquette de frein
a
Hors spécifications → Remplacer
l’ensemble.
Epaisseur de la plaquette
de frein:
4,4 mm (0,17 in)
:
1,0 mm (0,04 in)
2. Remplacer:
Plaquette de frein
Etapes du remplacement des pla-
quettes de frein:
Déposer le bouchon de goupille de
plaquette 1.
CHASSIS
CHASSIS

4 - 37
ENGCARBURETOR
Float height
1. Measure:
Float height
a
Out of specification
→ Adjust.
Float height:
8.0 mm (0.31 in)
Measurement and adjustment
steps:
Hold the carburetor in an upside
down position.
NOTE:Slowly tilt the carburetor in the
opposite direction, then take the
measurement when the needle
valve aligns with the float arm.
If the carburetor is level, the
weight of the float will push in
the needle valve, resulting in an
incorrect measurement.
Measure the distance between
the mating surface of the float
chamber and top of the float
using a vernier calipers.
NOTE:The float arm should be resting on
the needle valve, but not com-
pressing the needle valve.
If the float height is not within
specification, inspect the valve
seat and needle valve.
If either is worn, replace them
both.
If both are fine, adjust the float
height by bending the float tab
b on the float.
Recheck the float height.
EC464600Float
1. Inspect:
Float
1
Damage
→ Replace.
Starter plunger
1. Inspect:
Cold starter plunger
1
Hot starter plunger
2
Wear/damage
→ Replace.
Hauteur du flotteur
1. Mesurer:
Hauteur du flotteur a
Hors spécifications → Régler.
Hauteur du flotteur:
8,0 mm (0,31 in)
Etapes de la mesure et du réglage:
Tenir le carburateur à l’envers.
N.B.:
Incliner lentement le carburateur
dans le sens opposé puis prendre la
mesure lorsque le pointeau s’aligne
avec le bras du flotteur.
Si le carburateur est horizontal, le
poids du flotteur repoussera le
pointeau vers l’intérieur et la
mesure sera erronée.
A l’aide d’un pied à coulisse,
mesurer la distance entre la surface
de contact de la cuve à niveau
constant et le haut du flotteur.
N.B.:
Le bras du flotteur doit reposer sur le
pointeau mais sans le comprimer.
Si la hauteur du flotteur est hors
spécifications, contrôler le siège de
pointeau et le pointeau.
Si l’une ou l’autre de ces pièces est
usée, les remplacer toutes les deux.
Si ces deux pièces sont en bon état,
régler la hauteur du flotteur en
courbant la languette du flotteur
b.
Contrôler à nouveau la hauteur du
flotteur.
Flotteur
1. Contrôler:
Flotteur 1
Endommagement → Remplacer.
Plongeur de starter
1. Contrôler:
Plongeur de démarrage à froid 1
Plongeur de démarrage à chaud
2
Usure/endommagement → Rem-
placer.
CARBURATEUR

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 hoses
to the carburetor so that the hoses
do not bend near where they are
installed.
Accelerator pump timing
adjustment
Adjustment steps:
NOTE:In order for the throttle valve
height
a to achieve the specified
value, tuck under the throttle
valve plate
1 the rod
2 etc. with
the same outer diameter as the
specified value.
Throttle valve height:
1.5 mm (0.06 in)
Fully turn in the accelerator
pump adjusting screw
3.
Check that the link lever
4 has
free play
b by pushing lightly
on it.
Gradually turn out the adjusting
screw while moving the link
lever until it has no more free
play.
Carburetor installation
1. Install:
Carburetor joint
1
NOTE:Install the projection
a on the cylin-
der between the carburetor joint slots
b.
T R..3 Nm (0.3 m · kg, 2.2 ft · lb)
2. Install:
Carburetor
1
NOTE:Install the projection
a between the
carburetor joint slots.
18. Monter:
Joint torique 1
Couvercle du boîtier du levier de
soupape 2
Boulon
(couvercle du boîtier du levier de
soupape) 3
19. Monter:
Durit de mise à l’air du carbura-
teur 1
N.B.:
Monter les durits de mise à l’air du car-
burateur sur le carburateur de manière
que les durits ne fassent pas de coude à
proximité de leur point de montage.
Réglage du calage de la pompe de
reprise
Étapes du réglage:
N.B.:
Afin de donner au papillon la hauteur
a spécifiée, glisser sous le papillon
d’admission 1 la tige 2 etc. dont le
diamètre extérieur correspond à la
valeur spécifiée.
Hauteur du papillon:
1,5 mm (0,06 in)
Visser à fond la vis de réglage de la
pompe de reprise 3.
Contrôler que le levier articulé 4 a
du jeu b en appuyant légèrement
dessus.
Dévisser progressivement la vis de
réglage tout en déplaçant le levier
articulé jusqu’à ce qu’il n’ait plus
de jeu.
Montage du carburateur
1. Monter:
Raccord de carburateur 1
N.B.:
Monter l’ergot a du cylindre entre les
fentes du raccord de carburateur b.
T R..3 Nm (0,3 m · kg, 2,2 ft · lb)
2. Monter:
Carburateur 1
N.B.:
Monter l’ergot a entre les fentes du rac-
cord du carburateur.
CARBURATEUR