2003 YAMAHA YZ250LC oil

5-41
CHASHANDLEBAR
EC5B3000
REMOVAL POINTS
EC5B3100Master cylinder
1. Remove:
9Master cylinder bracket 1
9Master cylinder 2
cC
9Do not let the master cylinder hang on the
brake hose.
9Keep the master cylinder cap side horizontal
to prevent air from coming in.
EC5B3200
Grip
1. Remove:
9Grip 1
NOTE:
Blow in air between the handlebar or tube guide
and the grip. Then remove the grip which has
become loose.
EC5B4000
INSPECTION
EC5B4100
Handlebar
1. Inspect:
9Handlebar 1
Bends/Cracks /DamageReplace.
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Do not attempt to straighten a bent handlebar
as this may dangerously weaken the handlebar.
EC5B5000
ASSEMBLY AND INSTALLATION
EC5B5100
Throttle assembly
1. Install
9Grip (right) 1
Apply the adhesive on the tube guide 2.
NOTE:
9Before applying the adhesive, wipe off grease
or oil on the tube guide surface awith a lac-
quer thinner.
9Align the mating mark bon the grip (right) with
the slot cin the tube guide.
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5-42
CHASHANDLEBAR
2. Install:
9Grip cap (upper) 1
9Grip cap (lower) 2
9Bolt (grip cap) 3
NOTE:
Temporarily tighten the bolts (grip cap).
EC5B5210
Handlebar
1. Install:
9Handlebar 1
9Handlebar holder 2
9Bolt (handlebar holder) 3
NOTE:
9The upper handlebar holder should be installed
with the punched mark aforward.
9First tighten the bolts on the front side of the
handlebar holder, and then tighten the bolts on
the rear side.
2. Install:
9Grip (left) 1
Apply the adhesive to the handlebar 2.
NOTE:
9Before applying the adhesive, wipe off grease
or oil on the handlebar surface awith a lac-
quer thinner.
9Install the grip (left) to the handlebar so that the
line bbetween the two arrow marks faces
straight upward.
3. Install:
9Collar 1
9Cap cover 2
9Throttle 3
NOTE:
9Apply the lithium soap base grease on the
throttle grip sliding surface.
9Tighten the grip cap bolts temporarily without the
throttle being fixed to the handlebar.
28 Nm (2.8 m•kg, 20 ft•lb)
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5-52
CHASSWINGARM
Extent of removal Order Part name Q’ty Remarks
SWINGARM DISASSEMBLY
1Cap 2
2Relay arm 1
3Connecting rod 1
4Collar 2
5Oil seal 2
6Thrust bearing 2
7Bush 2
8Oil seal 8
9Bearing 8 Refer to “REMOVAL POINTS”. Extent of removal:1Swingarm disassembly 2Connecting rod removal and disassembly
3Relay arm removal and disassembly
1
2
3
23
EC578000
SWINGARM DISASSEMBLY
80 Nm (8.0 m•kg, 58 ft•lb)
6 Nm (0.6 m•kg, 4.3 ft•lb)
80 Nm (8.0 m•kg, 58 ft•lb)
2 Nm (0.2 m•kg, 1.4 ft•lb)
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5-53
CHASSWINGARM
EC573000
REMOVAL POINTS
EC573201
Bearing
1. Remove:
9Bearing 1
NOTE:
Remove the bearing by pressing its outer race.
EC574010
INSPECTION
Wash the bearings, bushes, collars, and covers in
a solvent.
EC574111
Swingarm
1. Inspect:
9Bearing 1
9Bush 2
Free play exists/Unsmooth revolution/Rust 
Replace bearing and bush as a set.
2. Inspect:
9Oil seal 3
Damage Replace.
EC574211
Relay arm
1. Inspect:
9Bearing (polylube bearing) 1
9Collar 2
Free play exists/Unsmooth revolution/Rust 
Replace bearing and collar as a set.
2. Inspect:
9Bearing (polylube bearing) 1
Loss of solid lubrication Replace.
9Oil seal 3
Damage Replace.
NOTE:
Polylube bearings, with solid lubrication, have
been adopted with the intent to make the needle
bearings, used in this model, maintenance free.
With polylube bearings, no grease nipple and
regular lubrication is necessary. However,
grease should be applied to all oil seals and col-
lars when removed or installed.
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5-54
CHASSWINGARM
EC575000
ASSEMBLY AND INSTALLATION
EC575202
Bearing and oil seal
1. Install:
9Bearing 1
9Oil seal 2
To swingarm.
NOTE:
9Apply the molybdenum disulfide grease on the
bearing when installing.
9Install the bearing by pressing it on the side hav-
ing the manufacture's marks or numbers.
9First install the outer and then the inner bear-
ings to a specified depth from inside.
Installed depth of bearings:
Outer a a
: Zero mm (Zero in)
Inner b b
: 8.5 mm (0.33 in)
EC574311
Connecting rod
1. Inspect:
9Bearing (polylube bearing) 1
9Collar 2
Free play exists/Unsmooth revolution/Rust 
Replace bearing and collar as a set.
2. Inspect:
9Bearing (polylube bearing) 1
Loss of solid lubrication Replace.
9Oil seal 3
Damage Replace.
NOTE:
Polylube bearings, with solid lubrication, have
been adopted with the intent to make the needle
bearings, used in this model, maintenance free.
With polylube bearings, no grease nipple and
regular lubrication is necessary. However,
grease should be applied to all oil seals and col-
lars when removed or installed.
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5-55
CHASSWINGARM
EC5751B3
Swingarm
1. Install:
9Bush 1
9Thrust bearing 2
9Oil seal 3
9Collar 4
To swingarm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bushes, thrust bearings and oil seal lips.
2. Install:
9Collar 1
To relay arm 2.
NOTE:
Apply the molybdenum disulfide grease on the
collars and oil seal lips.
3. Install:
9Bearing 1
9Oil seal 2
To connecting rod.
NOTE:
9Apply the molybdenum disulfide grease on the
bearing when installing.
9Install the bearing by pressing it on the side hav-
ing the manufacture's marks or numbers.
Installed depth of bearings a a
:
5 mm (0.20 in)
2. Install:
9Bearing 1
9Oil seal 2
To relay arm.
NOTE:
9Apply the molybdenum disulfide grease on the
bearing when installing.
9Install the bearing by pressing it on the side hav-
ing the manufacture's marks or numbers.
Installed depth of bearings a a
:
5 mm (0.20 in)
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5-56
CHASSWINGARM
5. Install:
9Relay arm 1
9Bolt (relay arm) 2
9Plain washer 3
9Nut (relay arm) 4
To swingarm.
NOTE:
9Apply the molybdenum disulfide grease on the
bolt.
9Do not tighten the nut yet.
6. Install:
9Swingarm 1
9Pivot shaft 2
NOTE:
9Apply the molybdenum disulfide grease on the
pivot shaft.
9Insert the pivot shaft from right side.
85 Nm (8.5 m•kg, 61 ft•lb)
4. Install:
9Connecting rod 1
9Bolt (connecting rod) 2
9Plain washer 3
9Nut (connecting rod) 4
To relay arm 5.
NOTE:
Apply the molybdenum disulfide grease on the
bolt.
80 Nm (8.0 m•kg, 58 ft•lb)
3. Install:
9Collar 1
To connecting rod 2.
NOTE:
Apply the molybdenum disulfide grease on the
collar and oil seal lips.
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5-60
CHASREAR SHOCK ABSORBER
EC586000
HANDLING NOTE
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This shock absorber is provided with a
separate type tank filled with high-pressure
nitrogen gas. To prevent the danger of ex-
plosion, read and understand the following
information before handling the shock ab-
sorber.
The manufacturer can not be held respon-
sible for property damage or personal in-
jury that may result from improper han-
dling.
1. Never tamper or attempt to disassemble
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 ni-
trogen 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 sur-
face of the piston rod with the cylinder;
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, fol-
low the instructions on disposal.
EC587000
NOTES ON DISPOSAL (YAMAHA DEAL-
ERS 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.
w
To dispose of a damaged or worn-out
shock absorber, take the unit to your
Yamaha dealer for this disposal procedure.
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