stop start YAMAHA YZ450F 2006 User Guide

SPEC
2 - 12
NOTE:
- marked portion shall be checked for torque tightening after break-in or before each race.
NOTE:
*1: Tighten the cylinder head bolts to 30 Nm (3.0 m  kg, 22 ft  lb) in the proper tightening sequence,
remove and retighten the cylinder head bolts to 20 Nm (2.0 m  kg, 14 ft  lb) in the proper tightening
sequence, and then tighten the cylinder head bolts further to reach the specified angle 180° in the
proper tightening sequence.Crankcase cover (right) M6 × 1.0 8 10 1.0 7.2
M6 × 1.0 2 12 1.2 8.7
Crankcase cover (left) M6 × 1.0 8 10 1.0 7.2
Crankcase M6 × 1.0 12 12 1.2 8.7
Clutch cable holder M6 × 1.0 2 10 1.0 7.2
Oil drain bolt (crankcase right) M10 × 1.25 1 20 2.0 14
(crankcase left) M8 × 1.25 1 20 2.0 14
Oil check bolt (crankcase) M6 × 1.0 1 10 1.0 7.2
Oil strainer M6 × 1.0 1 10 1.0 7.2
Crankcase bearing stopper M6 × 1.0 4 14 1.4 10
Crankcase bearing stopper M6 × 1.0 8 10 1.0 7.2
Drive axle oil seal stopper M6 × 1.0 2 10 1.0 7.2
Ratchet wheel guide M6 × 1.0 2 12 1.2 8.7
Kick starter M8 × 1.25 1 33 3.3 24
Screw (kick starter) M6 × 1.0 1 7 0.7 5.1
Primary drive gear M20 × 1.0 1 110 11.0 80
Clutch boss M20 × 1.0 1 75 7.5 54
Clutch cable adjust bolt and locknut M6 × 0.75 1 4 0.4 2.9
Clutch spring M6 × 1.0 6 10 1.0 7.2
Balancer M10 × 1.0 1 45 4.5 32
Balancer driven gear M14 × 1.0 1 50 5.0 36
Balancer weight plate M6 × 1.0 3 10 1.0 7.2
Drive sprocket M20 × 1.0 1 75 7.5 54
Drive sprocket cover M6 × 1.0 2 8 0.8 5.8
Shift pedal M6 × 1.0 1 12 1.2 8.7
Shift guide M6 × 1.0 2 10 1.0 7.2
Stopper lever M6 × 1.0 1 10 1.0 7.2
Segment M8 × 1.25 1 30 3.0 22 Part to be tightened Thread size Q’tyTightening torque
Nm m·kg ft·lb
MAINTENANCE SPECIFICATIONS

2 - 22
SPECCABLE ROUTING DIAGRAM
1Hot starter cable
2Clamp
3TPS (throttle position sensor)
lead
4Hump (frame)
5Neutral switch lead
6Engine bracket
7Engine skid plate stay
8CDI magneto lead
9Clutch cable
0Radiator breather hose
ARadiator hose 2
B“ENGINE STOP” button leadCSub wire harness
DGround lead
ECDI unit bracket
FCDI unit
GCable guide
HIgnition coil lead
IThrottle cable
ÈFasten the hot starter cable and
throttle cables onto the frame.
Locate the clamp ends under
the hot starter cable.ÉFasten the hot starter cable,
throttle cables, TPS lead and
ignition coil lead to the frame.
ÊFasten the TPS lead to the
frame behind its hump.
ËPass the TPS lead over the hot
starter cable.
ÌPass the neutral switch lead on
the inside of the engine bracket.
ÍPass the neutral switch lead
over the engine skid plate stay.
C-C
G-G
E
2
Õ
4 58E
É
D GGA
AB
D
5
ÌÍ Í
Í Î
F
E
D
2
2
2
Ï Ð Ò
Ñ Ó
1
G
2
3
4 2
0
8
5
9
8Ë Ê
0
0 8 5
CC
B
È 2
9
FF
Ô
Ô
B-B
A-A
I
H
3
1
C
B
A
0
0
8
5
D-D
3 F-F
6
7
2 5 0

2 - 22
SPEC
1Warmstartzug
2Klemme
3Drosselklappensensor-Kabel
4Buckel (Rahmen)
5Leerlaufschalter-Kabel
6Motorhalterung
7Motorschutzhalterung
8Lichtmaschinen-Kabel
9Kupplungszug
0Kühler-Entlüftungsschlauch
AKühlerschlauch 2
BKabel des Motorstoppschalters “ENGINE STOP”
CNebenkabelbaum
DMassekabel
EZündbox-Halterung
FZündbox
GKabelführung
HZündspulenkabel
IGaszug
ÈDen Warmstartzug und die Gaszüge am Rah-
men befestigen. Die Klemmen-Enden müssen
sich unter dem Warmstartzug befinden.
ÉDen Warmstartzug, die Gaszüge, das Drossel-
klappensensor-Kabel und das Zündspulen-
Kabel am Rahmen befestigen.
ÊDas Drosselklappensensor-Kabel nach der Wöl-
bung am Rahmen befestigen.
ËDas Drosselklappensensor-Kabel über den
Warmstartzug führen.
ÌDas Leerlaufschalter-Kabel hinter die Motorhal-
terung führen.
ÍDas Leerlaufschalter-Kabel über die Motor-
schutzhalterung führen.
DIAGRAMME D’ACHEMINEMENT DES CABLES
KABELFÜHRUNGSDIAGRAMME
1Câble de starter à chaud
2Collier à pince
3Fil du capteur de position de papillon des gaz
4Bosse (cadre)
5Fil du contacteur de point mort
6Support de moteur
7Support de la plaque de protection du moteur
8Fil du volant magnétique C.D.I.
9Câble d’embrayage
0Durit de mise à l’air du radiateur
ADurit de radiateur 2
BFil du bouton “ENGINE STOP”
CFaisceau de fils secondaire
DFil de terre
ESupport de boîtier CDI
FBoîtier C.D.I.
GGuide-câble
HFil de la bobine d’allumage
ICâble des gaz
ÈFixer le câble de démarrage à chaud et les câbles des
gaz au cadre. Placer les extrémités du collier à pince
sous le câble de démarrage à chaud.
ÉAttacher le câble de starter à chaud, les câbles des
gaz, le fil du capteur de position de papillon des gaz
et le fil de la bobine d’allumage au cadre.
ÊFixer le câble du capteur de position de papillon des
gaz derrière la bosse du cadre.
ËAcheminer le câble du capteur de position de papillon
des gaz au-dessus du câble de starter à chaud.
ÌAcheminer le fil du contacteur de point mort à l’inté-
rieur du support de moteur.
ÍAcheminer le fil du contacteur de point mort au-des-
sus du support de la plaque de protection.

2 - 26
SPECCABLE ROUTING DIAGRAM
1Throttle cable
2Clamp
3Hot starter cable
4Clutch cable
5“ENGINE STOP” button lead
6Cable guide
7Brake hose
8Hose guideÈFasten the “ENGINE STOP” button lead to the
handlebar.
ÉPass the clutch cable and hot starter cable
through the cable guide.
ÊPass the brake hose in front of the number plate.
ËPass the throttle cables through the cable guide.
ÌPass the clutch cable and hot starter cable
through the cable guide on the number plate.
A
B
C
A
B
C40˚± 10˚
40˚± 10˚
2
È3
2
5
4
2
3
5
6
Ë1
4
5
7
Ê
6
É
Ì
8

2 - 26
SPEC
1Gaszug
2Klemme
3Warmstartzug
4Kupplungszug
5Kabel des Motorstoppschalters “ENGINE STOP”
6Kabelführung
7Bremsschlauch
8Schlauchführung
ÈDas Kabel des Motorstoppschalters “ENGINE
STOP” am Lenker befestigen.
ÉDen Kupplungszug und den Warmstartzug
durch die Kabelführung führen.
ÊDen Bremsschlauch an der Vorderseite des
Nummernschildes entlang führen.
ËDie Gaszüge durch die Führung leiten.
ÌDen Kupplungszug und den Warmstartzug
durch die Kabelführung am Nummernschild füh-
ren.
DIAGRAMME D’ACHEMINEMENT DES CABLES
KABELFÜHRUNGSDIAGRAMME
1Câble des gaz
2Collier à pince
3Câble de starter à chaud
4Câble d’embrayage
5Fil du bouton “ENGINE STOP”
6Guide-câble
7Durit de frein
8Guide de durit
ÈFixer le fil du bouton “ENGINE STOP” au guidon.
ÉAcheminer le câble d’embrayage et le câble de starter
à chaud dans le guide-câble.
ÊAcheminer la durit de frein devant la plaque d’identi-
fication.
ËAcheminer les câbles des gaz dans le guide-câble.
ÌAcheminer le câble d’embrayage et le câble de starter
à chaud dans le guide-câble sur la plaque d’identifica-
tion.

3 - 15
INSP
ADJ
ENGINE OIL REPLACEMENT
CAUTION:
Do not add any chemical additives or use
oils with a grade of CD
a or higher.
Do not use oils labeled “ENERGY CON-
SERVING II”
b or higher. Engine oil also
lubricates the clutch and additives could
cause clutch slippage.
Do not allow foreign materials to enter the
crankcase.
a
b
5. Start the engine and let it warm up for sev-
eral minutes.
CAUTION:
When the oil tank is empty, never start the
engine.
6. Idle the engine more than 10 seconds
while keeping the machine upright. Then
stop the engine and add the oil to the maxi-
mum level.
7. Install:
Oil tank cap
ENGINE OIL REPLACEMENT
1. Start the engine and let it warm up for sev-
eral minutes.
2. Stop the engine and place an oil pan under
the drain bolt.
3. Remove:
Oil tank plug 1
Oil filler cap 2
Drain bolt (with gasket) 3
Oil filter drain bolt (O-ring) 4
Drain bolt (with gasket) 5
Drain the crankcase and oil tank of its oil.

3 - 18
INSP
ADJIDLE SPEED ADJUSTMENT/
VALVE CLEARANCE ADJUSTMENT
EC35M021
IDLE SPEED ADJUSTMENT
1. Start the engine and thoroughly warm it up.
2. Adjust:
Idle speed
VALVE CLEARANCE 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 CHAPTER 4.
2. Remove:
Spark plug
Engine upper bracket
Hot starter plunger
Refer to “CARBURETOR” section in the
CHAPTER 4.
Cylinder head cover
Refer to “CAMSHAFTS” section in the
CHAPTER 4. Adjustment steps:
Adjust the pilot screw.
Refer to “PILOT SCREW ADJUSTMENT”
section.
Turn the throttle stop screw 1 until the
specified engine idling speed.
NOTE:
Using a digital engine tachometer for idle
speed adjustment, detect the engine idling
speed by bringing the sensing element c of
the engine tachometer close to the ignition
coil 2.
To increase idle speed
→
Turn the throttle stop screw
1 in
a.
To decrease idle speed
→
Turn the throttle stop screw
1 out
b.
Engine idling speed:
1,900 ~ 2,100 r/min
c2

4 - 13
ENG
2. Kontrollieren:
Hauptdüse 1
Leerlaufdüse 2
Nadeldüse 3
Chokedüse 4
Leerlauf-Luftdüse 5
Ausströmdüse 6
Beschädigt → Erneuern.
Verunreinigt → Reinigen.
HINWEIS:
Zum Reinigen ein Lösungsmittel auf Petro-
leumbasis verwenden. Sämtliche Kanäle und
Düsen mit Druckluft ausblasen.
Niemals einen Draht verwenden.
Nadelventil
1. Kontrollieren:
Nadelventil 1
Ventilsitz 2
Riefig a → Erneuern.
Verstaubt b → Reinigen.
Filter c
Verstopft → Reinigen.
Drosselklappe
1. Kontrollieren:
Leichtgängigkeit
Fest → Instand setzen, ggf. erneuern.
HINWEIS:
Die Drosselklappe 1 in das Vergasergehäuse
einsetzen und deren Leichtgängigkeit kontrol-
lieren.
Düsennadel
1. Kontrollieren:
Düsennadel 1
Verbogen/verschlissen → Erneuern.
Clip-Nut
Spiel vorhanden/verschlissen → Erneu-
ern.
Clipposition
Standard-Clipposition:
4. Nut
CARBURATEUR
VERGASER
2. Contrôler:
Gicleur principal 1
Gicleur de ralenti 2
Gicleur d’aiguille 3
Gicleur de starter 4
Gicleur d’air de ralenti 5
Gicleur de fuite 6
Endommagement → Remplacer.
Encrassé → Nettoyer.
N.B.:
Nettoyer avec un solvant à base de pétrole. Net-
toyer tous les conduits et gicleurs à l’air com-
primé.
Ne jamais utiliser de fil métallique.
Pointeau
1. Contrôler:
Pointeau 1
Siège de pointeau 2
Usure en creux a → Remplacer.
Poussière b → Nettoyer.
Filtre c
Bouché → Nettoyer.
Papillon des gaz
1. Contrôler:
Mouvement
Coincement → Réparer ou remplacer.
N.B.:
Insérer le papillon des gaz 1 dans le corps du car-
burateur et contrôler qu’il coulisse librement.
Aiguille
1. Contrôler:
Aiguille 1
Déformation/usure → Remplacer.
Rainure du clip
Jeu/usure → Remplacer.
Position du clip
Position standard du clip:
Rainure n°4

4 - 17
ENGCARBURETOR
8. Install:
Throttle shaft assembly 1
Plain washer (metal) 2
Plain washer (resin) 3
Valve lever 4
NOTE:
Apply the fluorochemical grease on the bear-
ings.
Fit the projection a on the throttle shaft
assembly into the slot b in the TPS (throttle
position sensor).
Make sure the stopper c of the spring fits
into the recess in the carburetor.
Turn the throttle shaft assembly left while
holding down the lever 1 5 and fit the throt-
tle stop screw tip d to the stopper e of the
throttle shaft assembly pulley.
1
23
4
b
a
c
e
d
5
9. Install:
Push rod 1
NOTE:
While holding down the lever 1 2, insert the
push rod farthest into the carburetor.12
10. Install:
Starter jet 1
Pilot jet 2
Spacer 3
Needle jet 4
Main jet 5

5 - 43
CHAS
EC5B0000
HANDLEBAR
Extent of removal:
1 Handlebar removal
Extent of removal Order Part name Q’ty Remarks
HANDLEBAR REMOVAL
Preparation for removal Number plate Remove the band only.
1 Hot starter cable 1 Disconnect at the lever side.
2 Hot starter lever holder 1
3 Clutch cable 1 Disconnect at the lever side.
4 Clutch lever holder 1
5“ENGINE STOP” button 1
6 Master cylinder 1 Refer to “REMOVAL POINTS”.
7 Throttle cable cap 1
8 Throttle cable #1 (pulled) 1 Disconnect at the throttle side.
9 Throttle cable #2 (pushed) 1 Disconnect at the throttle side.
10 Grip (right) 1 Refer to “REMOVAL POINTS”.
11 Tube guide 1
12 Collar 1
13 Grip (left) 1 Refer to “REMOVAL POINTS”.
14 Handlebar holder (upper) 2
15 Handlebar 1
16 Handlebar holder (lower) 2
1
HANDLEBAR