2000 YAMAHA YZ426F oil

5 - 42
CHAS

HANDLEBAR
2. Install:
l
Grip (left)
1

Apply the adhesive to the handlebar
2
.
NOTE:

l
Before applying the adhesive, wipe off
grease or oil on the handlebar surface
a
with a lacquer thinner.
l
Install the grip (left) to the handlebar so that
the line
b
between the two arrow marks
faces straight upward.
3. Install:
l
Grip (right)
1

l
Collar
2

Apply the adhesive on the tube guide
3
.
NOTE:

l
Before applying the adhesive, wipe off
grease or oil on the tube guide surface
a
with a lacquer thinner.
l
Install the grip to the tube guide so that the
grip match mark
b
and tube guide slot
c
form the angle as shown.
4. Install:
l
Collar
1

l
Throttle cables
2

To tube guide
3
.
NOTE:

Apply the lithium soap base grease on the
throttle cable end and tube guide cable wind-
ing portion.

5 - 51
CHASSWINGARM
EC578000
SWINGARM DISASSEMBLY
Extent of removal:1 Swingarm disassembly2 Connecting rod removal and disassembly
3 Relay arm removal and disassembly
Extent of removal Order Part name Q’ty Remarks
SWINGARM DISASSEMBLY
1 Cap 2
2 Relay arm 1
3 Connecting rod 1
4 Collar 2
5 Oil seal 2
6 Thrust bearing 2
7 Bush 2
8 Oil seal 8
9 Bearing 8 Refer to “REMOVAL POINTS”.
1
2
2
3
3

5 - 52
CHASSWINGARM
EC573000
REMOVAL POINTS
EC573200
Bearing
1. Remove:
lBearing 1
NOTE:
Install the bearing by pressing its outer race.
EC574010
INSPECTION
Wash the bearings, bushes, collars, and cov-
ers in a solvent.
EC574111
Swingarm
1. Inspect:
lBearing 1
lBush 2
Free play exists/unsmooth revolution/
rust ® Replace bearing and bush as a
set.
2. Inspect:
lOil seal 3
Damage ® Replace.
EC574210
Relay arm
1. Inspect:
lBearing 1
lCollar 2
Free play exists/unsmooth revolution/rust
® Replace bearing and collar as a set.
2. Inspect:
lOil seal 3
Damage ® Replace.
EC574310
Connecting rod
1. Inspect:
lBearing 1
lCollar 2
Free play exists/unsmooth revolution/rust
® Replace bearing and collar as a set.
2. Inspect:
lOil seal 3
lDamage ® Replace.

5 - 53
CHASSWINGARM
EC575000
ASSEMBLY AND INSTALLATION
EC575201
Bearing and oil seal
1. Install:
lBearing 1
lOil seal 2
To swingarm.
NOTE:
lApply the molybdenum disulfide grease on
the bearing when installing.
lInstall the bearing by pressing it on the side
having the manufacture’s marks or numbers.
lFirst install the outer and then the inner bear-
ings to a specified depth from inside.
Installed depth of bearings:
Outer a: Zero mm (Zero in)
Inner b: 8.5 mm (0.33 in)
2. Install:
lBearing 1
lOil seal 2
To relay arm.
NOTE:
lApply the molybdenum disulfide grease on
the bearing when installing.
lInstall the bearing by pressing it on the side
having the manufacture’s marks or numbers.
3. Install:
lBearing 1
lOil seal 2
To connecting rod.
NOTE:
lApply the molybdenum disulfide grease on
the bearing when installing.
lInstall the bearing by pressing it on the side
having the manufacture’s marks or numbers.
Installed depth of bearings a:
5 mm (0.20 in)
Installed depth of bearings a:
5 mm (0.20 in)

5 - 54
CHASSWINGARM
EC5751A0
Swingarm
1. Install:
lBush 1
lThrust bearing 2
lCollar 3
To swingarm 4.
NOTE:
Apply the molybdenum disulfide grease on the
bushes, thrust bearings and oil seal lips.
2. Install:
lCollar 1
To relay arm 2.
NOTE:
Apply the molybdenum disulfide grease on the
collars, bearings and oil seal lips.
3. Install:
lCollar 1
To connecting rod 2.
NOTE:
Apply the molybdenum disulfide grease on the
collar, bearings and oil seal lips.
4. Install:
lConnecting rod 1
lBolt (connecting rod) 2
lPlain washer 3
lNut (connecting rod) 4
To relay arm 5.
T R..80 Nm (8.0 m · kg, 58 ft · lb)
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
ACHTUNG:CAUTION:
Install the nut on the left side of the chas-
sis. If you make a mistake in its installation
position, the nut contacts the swingarm
when stroking the rear shock absorber.

5 - 59
CHAS
EC586000
HANDLING NOTE
WARNING
This shock absorber is provided with a
separate type tank filled with high-pressure
nitrogen gas. To prevent the danger of
explosion, read and understand the follow-
ing information before handling the shock
absorber.
The manufacturer can not be held respon-
sible for property damage or personal
injury that may result from improper han-
dling.
1. Never tamper or attempt to disassem-
ble the cylinder or the tank.
2. Never throw the shock absorber into
an open flame or other high heat. The
shock absorber may explode as a
result of nitrogen gas expansion and/
or damage to the hose.
3. Be careful not to damage any part of
the gas tank. A damaged gas tank will
impair the damping performance or
cause a malfunction.
4. Take care not to scratch the contact
surface of the piston rod with the cylin-
der; or oil could leak out.
5. Never attempt to remove the plug at
the bottom of the nitrogen gas tank. It
is very dangerous to remove the plug.
6. When scrapping the shock absorber,
follow the instructions on disposal.
EC587000
NOTES ON DISPOSAL (YAMAHA DEALERS
ONLY)
Before disposing the shock absorber, be sure
to extract the nitrogen gas from valve 1. Wear
eye protection to prevent eye damage from
escaping gas and/or metal chips.
WARNING
To dispose of a damaged or worn-out
shock absorber, take the unit to your
Yamaha dealer for this disposal procedure.
REAR SHOCK ABSORBER

5 - 60
CHAS
EC583000
REMOVAL POINTS
EC583300
Bearing
1. Remove:
lStopper ring 1
NOTE:
Press in the bearing while pressing its outer
race and remove the stopper ring.
2. Remove:
lBearing 1
NOTE:
Remove the bearing by pressing its outer race.
EC584000
INSPECTION
EC584110
Rear shock absorber
1. Inspect:
lDamper rod 1
Bends/damage ® Replace absorber
assembly.
lShock absorber 2
Oil leaks ® Replace absorber assem-
bly.
Gas leaks ® Replace absorber assem-
bly.
lSpring 3
Damage ® Replace spring.
Fatigue ® Replace spring.
Move spring up and down.
lSpring guide 4
lWear/damage ® Replace spring guide.
lBearing 5
Free play exists/unsmooth revolution/
rust ® Replace.
EC585000
ASSEMBLY AND INSTALLATION
EC585300
Bearing
1. Install:
lBearing 1
NOTE:
Install the bearing parallel until the stopper ring
groove appears by pressing its outer race.
ACHTUNG:CAUTION:
Do not apply the grease on the bearing
outer race because it will wear the rear
shock absorber surface on which the bear-
ing is press fitted.
REAR SHOCK ABSORBER

6 - 1
–+ELEC

ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1
“ENGINE STOP” button
2
TPS (throttle position sensor)
3
Neutral switch
4
CDI magneto
5
Ignition coil
6
Spark plug
7
CDI unit
COLOR CODE
B...................... Black
Br .................... Brown
G ..................... Green
L ...................... Blue
O ..................... Orange
P...................... Pink
R ..................... Red
EC612000
WIRING DIAGRAM
7
15
6
2 3 4
LY
BYL
B/LL
G
P
W
R
Y
B
G
BR PBrWG
RB Br WP
R/W WL/W SbW R/W Sb L/WY
B/LL Sb B OY
LB/L B OSbSb
L/WR/W
WSb
B/L
B/WB/W
B/WB/W
Br
BB
LBBY
O
N
13
4
5 2

Sb .................... Sky blue
W ..................... White
Y ...................... Yellow
B/L ................... Black/Blue
B/W .................. Black/White
L/W .................. Blue/White
R/W .................. Red/White
6