GENERAL SPECIFICATIONS
2 - 1
SPEC
EC200000
SPECIFICATIONS
EC211000
GENERAL SPECIFICATIONS
Model name: WR250FW (USA, CDN, AUS, NZ)
WR250F (EUROPE, ZA)
Model code number: 5UME (USA)
5UMF (EUROPE)
5UMG (CDN, AUS, NZ, ZA)
Dimensions: USA, ZA, CDN EUROPE, AUS, NZ
Overall length 2,165 mm (85.24 in) 2,180 mm (85.83 in)
Overall width 825 mm (32.48 in)←
Overall height 1,300 mm (51.18 in) 1,305 mm (51.38 in)
Seat height 980 mm (38.58 in) 990 mm (38.98 in)
Wheelbase 1,480 mm (58.27 in)←
Minimum ground clearance 365 mm (14.37 in) 370 mm (14.57 in)
Dry weight:
Without oil and fuel 106.0 kg (233.7 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)
Yamalube 4, SAE10W30 or SAE20W40
Yamalube 4-R, SAE10W50
API service SG type or higher,
JASO standard MA
(Except for USA and CDN)
SAE10W30, SAE10W40, SAE15W40,
SAE20W40 or SAE20W50
API service SG type or higher,
JASO standard MA
-20 -10 0 10 20 30 40 50
˚C 0 10 30 50 70 90 110 130
˚F
YAMALUBE 4(10W-30) or SAE 10W-30
YAMALUBE 4(20W-40) or SAE 20W-40
YAMALUBE 4-R(10W-50) or SAE 10W-50
-20 -10 0 10 20 30 40 50
˚C
SAE 10W-30
SAE 10W-40
SAE 15W-40
SAE 20W-40
SAE 20W-50
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 5UME E0
Main jet (M.J) #170
Main air jet (M.A.J) #115
Jet needle (J.N) NJRU
Cutaway (C.A) 1.5
Pilot jet (P.J) #42
Pilot air jet (P.A.J) #70
Pilot outlet (P.O)ø0.9
Bypass (B.P)ø1.0
Valve seat size (V.S)ø3.8
Starter jet (G.S) #68
Leak jet (Acc.P) #70
Float height (F.H) 8 mm (0.31 in)
Engine idle speed 1,750 ~ 1,950 r/min
Intake vacuum 31.3 ~ 36.7 kPa
(235 ~ 275 mmHg,
9.25 ~ 10.83 inHg)
Hot starter lever free play 3 ~ 6 mm
(0.12 ~ 0.24 in) Item Standard Limit
5 - 25
ENGCARBURETOR
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.
Accelerator pump
1. Inspect:
Diaphragm
(accelerator pump)
1
Spring (accelerator pump)
2
Accelerator pump cover
3
O-ring
4
Push rod
5
Tears (diaphragm)/damage
→
Replace.
Dirt
→ Clean.
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.
Pompe de reprise
1. Contrôler:
Diaphragme
(pompe de reprise) 1
Ressort (pompe de reprise) 2
Couvercle de la pompe de reprise
3
Joint torique 4
Tige de débrayage 5
Craquelures (diaphragme)/
endommagement → Remplacer.
Saleté → Nettoyer.
CARBURATEUR
