stop start YAMAHA WR 250F 2002 User Guide

INSP
ADJ
CHANGEMENT DE L’HUILE DE MOTEUR
MOTORÖL WECHSELN
SOSTITUZIONE DELL’OLIO MOTORE
MOTORÖL WECHSELN
1. Den Motor starten, mehrere
Minuten warmlaufen lassen,
und dann ausschalten und
fünf Minuten warten.
2. Die Maschine auf ebenem Ort
abstellen und auf dem Motor
aufbocken.
3. Einen geeigneten Behälter un-
ter den Motor stellen.
4. Demontieren:
Öltankdeckel 1
Rahmen des Ölablaufstop-
fens 2
Kurbelwellen-Ölablaufstop-
fen 3
Ölfilterelement-Ablaufstop-
fen 4
Das Kurbelgehäuse und den
Öltank (Rahmen) leerlaufen
lassen.
5. Demontieren:
Unterer Motorbügel
Ölschlauchklammer 1
Steckschraube (Öl-
schlauch) 2
Ölschlauch 3
Ölsieb (Rahmen) 4
6. Kontrollieren:
Ölsieb (Rahmen)
Verstopft → Ausblasen. CHANGEMENT DE L’HUILE DE
MOTEUR
1. Mettre le moteur en marche, le
faire chauffer pendant quelques
minutes, puis le couper et atten-
dre cinq minutes.
2. Placer le véhicule sur un plan
horizontal et le dresser à la verti-
cale en plaçant un support adé-
quat sous le moteur.
3. Déposer un récipient adéquat
sous le moteur.
4. Déposer:
Bouchon du réservoir d’huile
1
Boulon de vidange d’huile au
cadre 2
Boulon de vidange d’huile de
carter 3
Boulon de vidange d’élément
de filtre à huile 4
Vidanger l’huile du carter
moteur et du réservoir d’huile
(cadre).
5. Déposer:
Support inférieur de moteur
Bride de durit d’huile 1
Boulon (durit d’huile) 2
Durit d’huile 3
Crépine d’huile (cadre) 4
6. Vérifier:
Crépine d’huile (cadre)
Bouché → Passer à l’air com-
primé.SOSTITUZIONE DELL’OLIO
MOTORE
1. Avviare il motore, riscaldarlo per
alcuni minuti e quindi spegnerlo
ed attendere cinque minuti.
2. Posizionare il veicolo su una
superficie piana e tenerlo in posi-
zione eretta utilizzando il caval-
letto apposito posto sotto al
motore.
3. Posizionare un contenitore ido-
neo sotto al motore.
4. Rimuovere:
Tappo del serbatoio dell’olio
1
Bullone di scarico dell’olio del
telaio 2
Bullone di scarico dell’olio del
carter 3
Bullone di scarico elemento fil-
trante 4
Scaricare l’olio dal carter e dal
serbatoio dell’olio (telaio).
5. Rimuovere:
Staffa motore inferiore
Fascetta fermatubo dell’olio 1
Bullone (tubo flessibile
dell’olio) 2
Tubo flessibile dell’olio 3
Filtro dell’olio (telaio) 4
6. Ispezionare:
Filtro dell’olio (telaio)
Intasato → Pulire con aria.
3 - 16

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 1 until the
engine runs at the lowest possible speed.
To increase idle speed → Turn the throt-
tle stop screw 1 in a.
To decrease idle speed → Turn the throt-
tle stop screw 1 out b.
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
Engine idling speed:
1,800 ~ 2,100 r/min
VALVE CLEARANCE INSPECTION AND
ADJUSTMENT
NOTE:
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 - 16
ENGCARBURETOR
10. Install:
Starter jet 1
Pilot jet 2
Spacer 3
Needle jet 4
Main jet 5
11. Install:
Valve seat
Screw (valve seat) 1
Needle valve 2
Float 3
Float pin 4
NOTE:
After installing the needle valve to the float,
install them to the carburetor.
Check the float for smooth movement.
12. Install:
Pilot screw 1
Spring 2
Washer 3
O-ring 4
* For EUROPE
** For CDN, ZA, AUS and NZNote the following installation points:
Turn in the pilot screw until it is lightly
seated.
Turn out the pilot screw by the number of
turns recorded before removing.
Pilot screw:
2 turns out
* 1 turn out
** 1-1/8 turns out
(example)
13. Install:
O-ring
Leak jet 1
Float chamber 2
Bolt (float chamber) 3
Cable holder (throttle stop screw cable)
4
Hose holder (carburetor breather hose)
5

6 - 4
–+ELEC

IGNITION SYSTEM
SPARK GAP TEST
1. Disconnect the spark plug cap from spark
plug.
2. Connect the dynamic spark tester
1
(ignition checker
2
) as shown.

Spark plug cap
3


Spark plug
4

Å
For USA and CDN
ı
Except for USA and CDN
3. Kick the kickstarter crank.
4. Check the ignition spark gap.
5. Start engine, and increase spark gap until
misfire occurs. (for USA and CDN only)
Minimum spark gap:
6.0 mm (0.24 in)
Å
ı

EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:

Couplers and leads connection
Rust/dust/looseness/short-circuit
→

Repair or replace.
ENGINE STOP SWITCH INSPECTION
1. Inspect:

Engine stop switch conduct
No continuous while being pushed
→
Replace.
Continuous while being freed
→
Replace.
Tester (+) lead
→
Black/White lead
1

Tester (–) lead
→
Black lead
2

B/W
1
B
2
Tester selec-
tor position
PUSH IN
Ω

×
1
FREE

–+ELEC
SYSTEME D’ALLUMAGE
ZÜNDANLAGE
IMPIANTO DI ACCENSIONE
ZÜNDFUNKENSTRECKE KON-
TROLLIEREN
1. Den Zündkerzenstecker von
der Zündkerze abziehen.
2. Den Zündfunkenstreckente-
ster 1 (bzw. 2) wie abgebil-
det anschließen.
Zündkerzenstecker 3
Zündkerze 4
ÅNur USA und CDN
ıNicht USA und CDN
3.Den Motor mit dem Kick-
starter durchdrehen
.
4. Die Zündfunkenstrecke kon-
trollieren.
5. Den Motor anlassen und die
Zündfunkenstrecke vergrö-
ßern, bis es zu Fehlzündun-
gen kommt (nur USA und
CDN).
Min. Zündfunkenstrecke
6,0 mm
STECKVERBINDER- UND KABEL-
ANSCHLÜSSE KONTROLLIEREN
1. Kontrollieren:
Steckverbinder- und Kabel-
anschlüsse
Rost/Staub/Lockerheit/Kurz-
schluß → Instand setzen
oder erneuern.
MOTORSTOPPSCHALTER
KONTROLLIEREN
1. Kontrollieren:
Motorstoppschalter
(auf Durchgang)
Kein Durchgang bei gedrücktem
Schalter → Erneuern.
Durchgang bei freigelassenem
Schalter → Erneuern. Meßkabel (+) →
schwarz/weiß 1
Meßkabel (–) → schwarz 2
B/W
1 B
2 Meßge-
rät-
Einstel-
GE-
DRÜCKT
Ω × 1
FREI
TEST DE LA LONGUEUR D’ETIN-
CELLE D’ALLUMAGE
1. Déconnecter le capuchon de bou-
gie de la bougie.
2. Connecter le testeur dynamique
d’étincelle 1 (testeur d’allu-
mage 2) comme indiqué.
Capuchon de bougie 3
Bougie 4
ÅPour les USA et le CDN
ıExcepté pour les USA et le CDN
3. Actionner le kick.
4. Contrôler la longueur d’étincelle
d’allumage.
5. Démarrer le moteur et augmenter
la longueur d’étincelle jusqu’à ce
qu’un raté se produise. (unique-
ment USA et CDN)
Longueur d’étincelle mini-
mum:
6,0 mm (0,24 in)
CONTROLE DES CONNEXIONS
DE COUPLEURS ET FILS
1. Contrôler:
Connexion de coupleurs et fils
Rouille/poussière/jeu/court-cir-
cuit → Réparer ou Remplacer.
CONTROLE DU COUPE-CIRCUIT
DU MOTEUR
1. Vérifier:
Continuité du coupe-circuit du
moteur
Pas de continuité lorsqu’enfoncé →
Remplacer.
Continuité lorsque relâché → Rempla-
cer.Fil (+) de multimètre →
Fil noir/blanc 1
Fil (–) de multimètre →
Fil noir 2
B/W
1B
2Position de
sélecteur
du multi-
mètre
EN-
FONCE
Ω × 1
RE-
LACHE
6 - 4
Test della distanza tra gli elettrodi
1. Staccare il cappuccio della can-
dela.
2. Collegare il tester della dinami-
cità della scintilla 1 (tester
dell’accensione 2) come illu-
strato.
Cappuccio della candela 3
Candela 4
ÅPer USA e CDN
ıTranne USA e CDN
3. Agire sulla pedivella di avvia-
mento.
4. Controllare la distanza tra gli
elettrodi.
5. Avviare il motore ed aumentare
la distanza tra gli elettrodi fino a
che non si verifica uno scatto a
vuoto. (Solo per USA e CDN)
Distanza minima tra gli
elettrodi:
6,0 mm (0,24 in)
ISPEZIONE DEI COLLEGAMENTI
DEGLI ACCOPPIATORI E DEI
CAVI
1. Controllare:
Collegamento degli accoppia-
tori e dei cavi
Ruggine/polvere/allentamento/
cortocircuito → Riparare o
sostituire.
ISPEZIONE DELL’INTERRUT-
TORE DI ARRESTO DEL MOTORE
1. Ispezionare:
Conduzione interruttore di
arresto motore
Assenza di continuità se premuto →
Sostituire.
Continuità se rilasciato→ Sostituire. Conduttore (+) del tester →
Conduttore nero/bianco 1
Conduttore (–) del tester →
Conduttore nero 2
B/W
1B
2Posizione
selettore
tester
PRE-
MUTO
Ω × 1
RILA-
SCIATO

6 - 11
–+ELEC
9. Tighten:
Screw (throttle position sensor) 1
NOTE:
Tighten the screws (throttle position sensor)
using the T20 bit (tamper resistant fastener
type).
10. Stop the engine.
THROTTLE POSITION SENSOR INPUT
VOLTAGE INSPECTION
1. Disconnect the throttle position sensor
coupler.
2. Start the engine.
3. Inspect:
Throttle position sensor input voltage
Out of specification → Replace the CDI
unit.
Tester (+) lead → Blue lead 1
Tester (–) lead → Black/Blue lead 2
Throttle posi-
tion sensor
input voltageTester selector
position
4 ~ 6 V DCV-20
THROTTLE POSITION SENSOR SYSTEM

–+ELEC
9. Festziehen:
Schraube (Drosselklappen-
sensor) 1
HINWEIS:
Die Schrauben (Drosselklappenposi-
tionssensor) mit dem T20 Bit (ver-
stellfeste Befestigung) lösen.
10. Den Motor stoppen.
PRÜFEN DER TPS-EINGANGS-
SPANNUNG
1. Die Drosselklappenpositions-
sensor-Steckverbindung tren-
nen.
2. Den Motor starten.
3. Prüfen:
Drosselklappenpositionssen-
sor-Eingangsspannung
Außerhalb des Sollwerts →
Die CDI-Einheit austau-
schen.
Prüfgerätkabel (+) →
Blaues Kabel 1
Prüfgerätkabel (–) →
Schwarzes/Blaues Kabel 2
Drosselklap-
penpositions-
sensor-
Eingangsspan-Prüfgeräte-
instellung
4–6 V DCV-20
9. Serrer:
Vis (capteur de papillon des
gaz) 1
N.B.:
Desserrer les vis (capteur de papillon des
gaz) à l’aide d’un embout T20 (pour vis
de type intraficable).
10. Arrêter le moteur.
CONTROLE DE LA TENSION
D’ENTREE DU CAPTEUR DE
PAPILLON DES GAZ
1. Débrancher la fiche rapide du
capteur de papillon des gaz.
2. Démarrer le moteur.
3. Contrôler:
Tension d’entrée du capteur de
papillon des gaz
Hors spécifications → Rempla-
cer le bloc CDI.
Fil (+) de multinètre →
Fil bleu 1
Fil (–) de multinètre →
Fil noir/bleu 2
Tension d’entrée
du capteur de
papillon des gaz Position du
sélecteur de
multinètre
4 à 6 V DCV-20
9. Serrare:
Vite (sensore di posizione della
valvola a farfalla) 1
NOTA:
Avvitare le viti (sensore di posizione
della valvola a farfalla) utilizzando la
punta T20 (tipo dispositivo di fissaggio
resistente alla manomissione).
10. Fermare il motore.
ISPEZIONE TENSIONE DI
INGRESSO SENSORE DELLA
POSIZIONE DELLA VALVOLA A
FARFALLA
1. Scollegare l’accoppiatore del sen-
sore di posizione della valvola a
farfalla
2. Avviare il motore.
3. Ispezionare:
Tensione di ingresso sensore di
posizione della valvola a far-
falla
Fuori specifica → Sostituire
l’unità CDI.
Conduttore (+) del tester →
Conduttore blu 1
Conduttore (–) del tester →
Conduttore nero/blu 2
Tensione di
ingresso sensore
di posizione della
valvola a farfallaPosizione
selettore
tester
4 ~ 6 V DCV-20
CONTROLE DE LA TENSION D’ENTREE DU CAPTEUR DE PAPILLON DES GAZ
PRÜFEN DER TPS-EINGANGSSPANNUNG
ISPEZIONE TENSIONE DI INGRESSO SENSORE DELLA POSIZIONE DELLA VALVOLA A
FARFALLA
6 - 11

7 - 2
TUN
CAUTION:


The carburetor is extremely sensitive to
foreign matter (dirt, sand, water, etc.).
During installation, do not allow foreign
matter to get into the carburetor.

Always handle the carburetor and its
components carefully. Even slight
scratches, bends or damage to carbure-
tor parts may prevent the carburetor from
functioning correctly. Carefully perform
all servicing with the appropriate tools
and without applying excessive force.

When the engine is stopped or when
riding at no load, do not open and close
the throttle unnecessarily. Otherwise, too
much fuel may be discharged, starting
may become difficult or the engine may
not run well.

After installing the carburetor, check that
the throttle operates correctly and opens
and closes smoothly.
Atmospheric conditions and carburetor
settings
The air density (i.e., concentration of oxygen
in the air) determines the richness or lean-
ness of the air/fuel mixture. Therefore, refer
to the above table for mixture settings.
That is:

Higher temperature expands the air with its
resultant reduced density.

Higher humidity reduces the amount of oxy-
gen in the air by so much of the water vapor
in the same air.

Lower atmospheric pressure (at a high alti-
tude) reduces the density of the air.
Air temp. HumidityAir
pressure
(altitude)Mixture Setting
High High Low (high) Richer Leaner
Low Low High (low) Leaner Richer
SETTING