Yamaha Wr250f Guida all'applicazione

5PH-28199-30

WR250F

(

)

OWNER’S SERVICE MANUAL

MANUEL D’ATELIER DU

ET PROPRIETAIRE

FAHRER- UND

WARTUNGS-HANDBUCH

MANUALE DI SERVIZIO DEL

PROPRIETARIO

3 - 10

INSP

ADJ

THROTTLE CABLE ADJUSTMENT

1. Check:

●Throttle grip free play a

Out of specification →Adjust.

Throttle grip free play a:

3 ~ 5 mm (0.12 ~ 0.20 in)

2. Adjust:

●Throttle grip free play

Throttle grip free play adjustment steps:

●Remove the throttle cable cap 1and

throttle cable cover 2.

OTE:

●Before adjusting the throttle cable free

play, the engine idle speed should be

adjusted.

●When the motorcycle is accelerating,

throttle cable #1 3is pulled and throttle

cable #2 4is pushed.

1st step:

●Loosen the locknuts 5on throttle cable

#2.

●Adjust the free play by changing their

tightening position.

2nd step:

●Loosen the locknuts 6on throttle cable

#1.

●Adjust the free play by changing their

tightening position.

●Tighten the locknuts.

WARNING

After adjusting, turn the handlebar to

right and left and make sure that the

engine idling does not run faster.

●Install the throttle cable cover and throttle

cable cap.

Throttle cable cover:

4 Nm (0.4 m • kg, 2.9 ft • lb)

3 - 11

INSP

ADJ

THROTTLE LUBRICATION/

DECOMPRESSION ADJUSTMENT

THROTTLE LUBRICATION

1. Remove:

●Rubber cover 1

●Throttle grip cap 2

2. Apply:

●Lithium soap base grease

On the throttle cable end a.

3. Install:

●Throttle grip cap

●Screw (throttle grip cap)

●Rubber cover

4 Nm (0.4 m · kg, 2.9 ft · lb)

DECOMPRESSION ADJUSTMENT

1. Check:

●Decompression lever free play a

Out of specification →Adjust.

Checking steps:

●Remove the timing mark accessing screw

1and crankshaft end accessing screw

●Turn the crankshaft counterclockwise with

a wrench.

OTE:

Squeezing the decompression lever allows

the crankshaft to be turned easily.

●Align the T.D.C. mark bon the rotor with

the align mark con the crankcase cover

when piston is at T.D.C. on compression

stroke.

●Check the free play.

Free play a:

5 ~ 9 mm (0.20 ~ 0.35 in)

3 - 19

INSP

ADJ

ENGINE IDLING SPEED ADJUSTMENT

1. Start the engine and thoroughly warm it

up.

2. Attach:

●Inductive tachometer

To spark plug lead.

3. Adjust:

●Engine idling speed

Adjustment steps:

●Adjust the pilot screw.

Refer to “PILOT SCREW ADJUSTMENT”

section.

●Turn the throttle stop screw 1until the

engine runs at the lowest possible speed.

To increase idle speed →

Turn the throttle stop screw 1in a.

To decrease idle speed →

Turn the throttle stop screw 1out b.

Inductive tachometer:

YU-08036-B

Engine tachometer:

90890-03113

Engine idling speed:

1,700 ~ 1,900 r/min

VALVE CLEARANCE INSPECTION AND

ADJUSTMENT

OTE:

●The valve clearance should be adjusted

when the engine is cool to the touch.

●The piston must be at Top Dead Center

(T.D.C.) on compression stroke to check or

adjust the valve clearance.

1. Remove:

●Seat

●Fuel tank

Refer to “SEAT, FUEL TANK AND

SIDE COVERS” section in the CHAP-

TER 4.

2. Drain:

●Coolant

Refer to “COOLANT REPLACEMENT”

section.

ENGINE IDLING SPEED ADJUSTMENT/

VALVE CLEARANCE INSPECTION AND ADJUSTMENT

4 - 7

ENG

CARBURETOR

Extent of removal: 1Carburetor removal

Extent of removal Order Part name Q’ty Remarks

CARBURETOR REMOVAL

Preparation for removal Seat and fuel tank Refer to “SEAT, FUEL TANK AND SIDE

COVERS” section.

1 Clamp 2

2 Throttle position sensor lead cou-

pler 1

3 Throttle cable cover 1

4 Throttle cable 2

5 Throttle cable cap 1

6 Clamp (air filter joint) 1 Loosen the screw (air filter joint).

7 Clamp (carburetor joint) 2 Loosen the screws (carburetor joint).

8 Carburetor assembly 1

9 Carburetor joint 1

4 - 8

ENG

CARBURETOR

EC468000

CARBURETOR DISASSEMBLY

Extent of removal: 1Carburetor disassembly

Extent of removal Order Part name Q’ty Remarks

CARBURETOR DISASSEMBLY

1Carburetor breather hose 4

2Valve lever housing cover 1

3Screw (throttle shaft) 1

4Throttle valve 1

5Needle holder 1

6Jet needle 1

7Accelerator pump cover 1

8Spring 1

9Diaphragm (accelerator pump) 1

0Air cut valve cover 1

ASpring (air cut valve) 1

BDiaphragm (air cut valve) 1

CFloat chamber 1

DLeak jet 1

EPilot screw 1 Refer to “REMOVAL POINTS”.

FFloat pin 1

4 - 9

ENG

CARBURETOR

Extent of removal Order Part name Q’ty Remarks

GFloat 1

HNeedle valve 1

IValve seat 1

JMain jet 1

KNeedle jet 1

LSpacer 1

MPilot jet 1

NStarter jet 1

OPush rod 1 Pull the push rod.

PThrottle shaft assembly 1

QPush rod link lever assembly 1

RIntake joint 1

SPilot air jet 1

TMain air jet 1

UCold starter plunger 1

VHot starter plunger (red) 1

4 - 10

ENG

CARBURETOR

HANDLING NOTE

CAUTION:

Do not loosen the screws (throttle position

sensor) 1except when changing the throt-

tle position sensor due to failure because it

will cause a drop in engine performance.

REMOVAL POINTS

Pilot screw

1. Remove:

●Pilot screw 1

OTE:

To optimize the fuel flow at a small throttle

opening, each machine’s pilot screw has been

individually set at the factory. Before removing

the pilot screw, turn it in fully and count the

number of turns. Record this number as the

factory-set number of turns out.

INSPECTION

Carburetor

1. Inspect:

●Carburetor body

Contamination →Clean.

OTE:

●Use a petroleum based solvent for cleaning.

Blow out all passages and jets with com-

pressed air.

●Never use a wire.

4 - 11

ENG

CARBURETOR

2. Inspect:

●Main jet 1

●Pilot jet 2

●Needle jet 3

●Starter jet 4

●Main air jet 5

●Pilot air jet 6

●Leak jet 7

Damage →Replace.

Contamination →Clean.

OTE:

●Use a petroleum based solvent for cleaning.

Blow out all passages and jets with com-

pressed air.

●Never use a wire.

Needle valve

1. Inspect:

●Needle valve 1

●Valve seat 2

Grooved wear a→Replace.

Dust band c→Clean.

OTE:

Replace the needle valve and valve seat as a

set.

EC464301

Throttle valve

1. Check:

●Free movement

Stick →Repair or replace.

OTE:

Insert the throttle valve 1into the carburetor

body, and check for free movement.

EC464401

Jet needle

1. Inspect:

●Jet needle 1

Bends/wear →Replace.

●Clip groove

Free play exists/wear →Replace.

●Clip position

* For EUROPE

** For CDN, ZA, AUS and NZ

Standard clip position:

No.3 Groove

*,** No.4 Groove

4 - 12

ENG

CARBURETOR

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.

OTE:

●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, result-

ing in an incorrect measurement.

●Measure the distance between the mating

surface of the float chamber and top of the

float using a vernier calipers.

OTE:

The float arm should be resting on the nee-

dle valve, but not compressing the needle

valve.

●If the float height is not within specifica-

tion, 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 bon the float.

●Recheck the float height.

EC464600

Float

1. Inspect:

●Float 1

Damage →Replace.

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