2014 YAMAHA WR 250F maintenance

2-8
MAINTENANCE SPECIFICATIONS
CHASSISCarburetor: ZA, AUS, NZ EUROPE
Type/manufacturer FCR-MX37/KEIHIN←----
I. D. mark 5UME E0 5UML L0 ----
Main jet (M.J) #170 #160 ----
Main air jet (M.A.J) #115←----
Jet needle (J.N) NJRU NNGU ----
Cutaway (C.A) 1.5←----
Pilot jet (P.J) #42 #45 ----
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) 8.0 mm (0.31 in)←----
Engine idle speed 1,750–1,950 r/min←----
Intake vacuum 31.0–37.0 kPa
(233–278 mmHg,
9.2–10.9 inHg)←----
Hot starter lever free play 3–6 mm (0.12–0.24
in)←----
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 0.090–0.170 mm (0.0035–0.0067 in) 0.24 mm
(0.0094 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 120.2 mm (4.73 in) ----
Height 240.0 mm (9.45 in) ----
Thickness 22.0 mm (0.87 in) ----
Radiator cap opening pressure 95.0–125.0 kPa (0.95–1.25 kg/cm
2, 13.8–
18.1 psi)----
Radiator capacity (total) 0.54 L (0.48 Imp qt, 0.57 US qt) ----
Water pump
Type Single-suction centrifugal pump ----Item Standard Limit
Item Standard Limit
Steering system:
Steering bearing typeTaper roller bearing ----

2-9
MAINTENANCE SPECIFICATIONS
Front suspension:
Front fork travel 300.0 mm (11.81 in) ----
Fork spring free length 460.0 mm (18.11 in) 455.0 mm
(17.91 in)
Spring rate, STD K = 4.40 N/mm (0.45 kg/mm, 25.12 lb/in) ----
Optional spring/spacer Yes ----
Oil capacity 648.0 cm
3 (22.85 lmp oz, 21.91 US oz) ----
Oil level 132.0 mm (5.20 in) ----
(From top of outer tube with inner
tube and damper rod fully compressed without
spring.)95.0–150.0 mm (3.74–5.91 in) ----
Oil grade Suspension oil "S1" ----
Inner tube outer diameter 48 mm (1.89 in) ----
Front fork top end 5 mm (0.20 in) ----
Rear suspension: AUS, NZ, ZA EUROPE
Shock absorber travel 130.0 mm (5.12 in)←----
Spring free length 260.0 mm (10.24 in)←----
Fitting length 245.0 mm (9.65 in) 248.5 mm (9.78 in) ----
Preload length
1.5–22 mm
(0.06–0.87 in)←----
Spring rate, STD K = 52.00 N/mm (5.30
kg/mm, 296.92 lb/in)←----
Optional spring Yes←----
Enclosed gas pressure 1,000 kPa (10.0 kg/cm
2,
142.2 psi)←----
Swingarm:
Swingarm free play limit
End ---- 1.0 mm (0.04
in)
Wheel: ZA AUS, NZ, EUROPE
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/Aluminum18 × 2.15/Aluminum ----
Rim runout limit:
Radial ---- ---- 2.0 mm (0.08
in)
Lateral ---- ---- 2.0 mm (0.08
in)
Drive chain:
Type/manufacturer DID520VM2/DAIDO ----
Number of links 113 links + joint ----
Chain slack 48.0–58.0 mm (1.89–2.28 in) ----
Chain length (15 links) ---- 239.3 mm
(9.42 in) Item Standard Limit

2-10
MAINTENANCE SPECIFICATIONS
ELECTRICALFront 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. 11.00 mm (0.43 in) ----
Caliper cylinder inside dia.27.00 mm (1.06 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 (0.43 in) ----
Caliper cylinder inside dia.25.40 mm (1.00 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)10.0 mm (0.39 in) ----
Clutch lever free play (lever end) 8.0–13.0 mm (0.31–0.51 in) ----
Throttle grip free play 3.0–5.0 mm (0.12–0.20 in) ---- Item Standard Limit
Item Standard Limit
Ignition system:
Advancer type Electrical ----
CDI: AUS, NZ, ZA EUROPE
Pickup coil resistance (color) 248–372 Ωat 20 °C (68
°F) (White–Red)←----
CDI unit-model/manufacturer5UM-F1/YAMAHA 5UM-L1/YAMAHA ----
Ignition coil:
Model/manufacturer 5UL-10/DENSO ----
Minimum spark gap 6.0 mm (0.24 in) ----
Primary coil resistance 0.07–0.10 Ωat 20 °C (68 °F) ----
Secondary coil resistance 4.56–6.84 kΩat 20 °C (68 °F) ----
Charging system:
System type AC magneto ----
Model (stator)/manufacturer 5UM 30/YAMAHA ----
Normal output 14.0 V/120 W at 5,000 r/min ----
Charging coil resistance (color) 0.28–0.43 Ω at 20 °C (68 °F) (White–Ground) ----
Lighting coil resistance (color) 0.22–0.33 Ω at 20 °C (68 °F) (Yellow–Ground) ----

2-11
MAINTENANCE SPECIFICATIONS
Rectifier/regulator:
Regulator type Semiconductor short circuit ----
Model/manufacture SH770AA/SHINDENGEN ----
Regulated voltage (AC) 12.5–13.5 V ----
Regulated voltage (DC) 14.0–15.0 V ----
Rectifier capacity (AC) 12.0 A ----
Rectifier capacity (DC) 8.0 A ----
Electric starting system:
Type Constant mesh ----
Starter motor:
Model/manufacturer 5UM01/YAMAHA ----
Operation voltage 12.0 V ----
Output 0.35 kW ----
Armature coil resistance 0.0189–0.0231 Ω at 20 °C (68 °F) ----
Brush overall length 7.0 mm (0.28 in) 3.50 mm (0.14
in)
Brush quantity 2 pcs. ----
Spring force 3.92–5.88 N (400–600 g, 14.11–21.17 oz) ----
Commutator diameter 17.6 mm (0.69 in) 16.6 mm (0.65
in)
Mica undercut (depth) 1.50 mm (0.06 in) ----
Starter relay:
Model/manufacturer RC19-042/MITSUBA ----
Amperage rating 180.0 A ----
Coil winding resistance 4.18–4.62 Ω at 20 °C (68 °F) ----
Starting circuit cut-off relay:
Model/manufacturer ACM33221 M38/MATSUSHITA ----
Coil winding resistance 75.6–92.5 Ω at 20 °C (68 °F) ----
Fuse (amperage×quantity):
Main fuse 10.0 A × 1 ----
Reserve fuse 10.0 A × 1 ----Item Standard Limit

3-1
MAINTENANCE INTERVALS FOR COMPETITION USE
REGULAR INSPECTION AND ADJUSTMENTS
MAINTENANCE INTERVALS FOR COMPETITION USE
• 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.
• Periodic inspection is essential in making full use of the machine performance. The service life of the parts varies sub-
stantially according to the environment in which the machine runs (e.g., rain, dirt, etc.). Therefore, earlier inspection is
required by reference to the list below.
ItemAfter
break-
inEvery
race
Every
third
(or 500
km)Every
fifth (or
1,000
km)
As re-
quiredRemarks
ENGINE OIL
Replace●●
VALVES
Check the valve clearances●●The engine must be cold.
Inspect●Check the valve seats and valve
stems for wear.
Replace●
VALVE SPRINGS
Inspect●Check the free length and the tilt.
Replace●
VALVE LIFTERS
Inspect●Check for scratches and wear.
Replace●
CAMSHAFTS Inspect the camshaft surface.
Inspect●Inspect the decompression system.
Replace●
CAMSHAFT SPROCKETS
Inspect●Check for wear on the teeth and for
damage.
Replace●
PISTON
Inspect●●Inspect crack.
Clean●Inspect carbon deposits and eliminate
them.
Replace●It is recommended that the piston pin
and ring are also replaced at the same
time.
PISTON RING
Inspect●Check ring end gap.
Replace●●
PISTON PIN
Inspect●
Replace●
CYLINDER HEAD Inspect carbon deposits and eliminate
them.
Inspect and clean●Change gasket.

3-2
MAINTENANCE INTERVALS FOR COMPETITION USE
CYLINDER
Inspect and clean●Inspect score marks.
Replace●Inspect wear.
CLUTCH
Inspect and adjust●●Inspect housing, friction plate, clutch
plate and spring.
Replace●
TRANSMISSION
Inspect●
Replace bearing●
SHIFT FORK, SHIFT CAM,
GUIDE BAR
Inspect●Inspect wear.
ROTOR NUT
Retighten●●
MUFFLER
Inspect and retighten●●
Clean●
Replace●
CRANK
Inspect and clean●●
CARBURETOR
Inspect, adjust and clean●●
AIR INDUCTION SYSTEM
Inspect and clean●● ●●
SPARK PLUG
Inspect and clean●●
Replace●
DRIVE CHAIN Use chain lube.
Lubricate, slack, alignment●●Chain slack: 48.0–58.0 mm (1.89–
2.28 in)
Replace●
COOLING SYSTEM
Check coolant level and leakage●●
Check radiator cap operation●
Replace coolant●Every two years
Inspect hoses●
OUTSIDE NUTS AND BOLTS
Retighten●●Refer to "STARTING AND BREAK-
IN" section in the CHAPTER 1.
AIR FILTER
Clean and lubricate●●Use foam air-filter oil or equivalent oil.
Replace● ItemAfter
break-
inEvery
race
Every
third
(or 500
km)Every
fifth (or
1,000
km)
As re-
quiredRemarks
3

3-3
MAINTENANCE INTERVALS FOR COMPETITION USE
OIL FILTER
Replace●●
ENGINE GUARD
Replace●Breakage
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, cali-
per bolts, master cylinder bolts
and union bolts●●
Replace pads●
Replace brake fluid●Every one year
FRONT FORKS
Inspect and adjust●●
Replace oil●●Suspension oil "S1"
Replace oil seal●
FRONT FORK OIL SEAL AND
DUST SEAL
Clean and lube●●Lithium base grease
PROTECTOR GUIDE
Replace●
REAR SHOCK ABSORBER
Inspect and adjust●●
Lube●(After
rain
ride)●Molybdenum disulfide grease
Retighten●●
DRIVE CHAIN GUIDE AND
ROLLERS
Inspect●●
SWINGARM
Inspect, lube and retighten●●Molybdenum disulfide grease
RELAY ARM, CONNECTING
ROD
Inspect, lube and retighten●●Molybdenum disulfide grease
SIDESTAND
Lubricate●Lithium base grease ItemAfter
break-
inEvery
race
Every
third
(or 500
km)Every
fifth (or
1,000
km)
As re-
quiredRemarks

3-4
MAINTENANCE INTERVALS FOR COMPETITION USE
STEERING HEAD
Inspect free play and retighten●●
Clean and lube●Lithium base grease
Replace bearing●
TIRE, WHEELS
Inspect air pressure, wheel run-
out, tire wear and spoke loose-
ness●●
Retighten sprocket bolt●●
Inspect bearings●
Replace bearings●
Lubricate●Lithium base grease
THROTTLE, CONTROL CABLE
Check routing and connection●●
Lubricate●●Yamaha cable lube or SAE 10W-40
motor oil
HOT STARTER, CLUTCH LEVER
Inspect free play●
BATTERY
Check terminal for looseness
and corrosion● ItemAfter
break-
inEvery
race
Every
third
(or 500
km)Every
fifth (or
1,000
km)
As re-
quiredRemarks