service YAMAHA XTZ125 2003 User Guide

6-8
6-8 e.Fill engine with oil. Install the oil filter cap and tighten.
NOTE:
Recommended engine oil classification; API Service “SH”
type or equivalent
Recommended oil:
YAMALUBE 4
Oil quantity:
Total amount:
1.2 L ( 0.264 Imp gal, 0.317 US gal)
Periodic oil change:
1.0 L ( 0.220 Imp gal, 0.264 US gal)
f. Start the engine and warm up for a few minutes. While
warming up, check for oil leakage. If oil leakage is found,
stop the engine immediately, and check for the cause.
g. Stop the engine and check the oil level.
CAUTION:
Be sure no foreign material enters the crankcase.
CAUTION:
Do not put in any chemical additives. Engine oil also
lubricates the clutch and additives could cause clutch
slippage.
After replacing the engine oil, be sure to check the oil
pressure.
CAUTION:
e.Fill engine with oil. Install the oil filter cap and tighten.
NOTE:
Recommended engine oil classification; API Service “SH”
type or equivalent
Recommended oil:
YAMALUBE 4
Oil quantity:
Total amount:
1.2 L ( 0.264 Imp gal, 0.317 US gal)
Periodic oil change:
1.0 L ( 0.220 Imp gal, 0.264 US gal)
f. Start the engine and warm up for a few minutes. While
warming up, check for oil leakage. If oil leakage is found,
stop the engine immediately, and check for the cause.
g. Stop the engine and check the oil level.
CAUTION:
Be sure no foreign material enters the crankcase.
CAUTION:
Do not put in any chemical additives. Engine oil also
lubricates the clutch and additives could cause clutch
slippage.
After replacing the engine oil, be sure to check the oil
pressure.
CAUTION:

6-12
6-12Valve clearance adjustment
The correct valve clearance changes with use, resulting in
improper fuel/air supply or engine noise. To prevent this,
valve clearance must be adjusted regularly. This adjustment,
however, should be left to a professional Yamaha service
technician. Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting should
be left to a Yamaha dealer who has the professional
knowledge, specialized data, and equipment to do so
properly. However, the following may be serviced by the
owner as part of routine maintenance.
CAUTION:
The carburetor was set at Yamaha factory after many
tests. If the settings are changed, poor engine
performance and damage may result.
Valve clearance adjustment
The correct valve clearance changes with use, resulting in
improper fuel/air supply or engine noise. To prevent this,
valve clearance must be adjusted regularly. This adjustment,
however, should be left to a professional Yamaha service
technician. Carburetor adjustment
The carburetor is a vital part of the engine. Adjusting should
be left to a Yamaha dealer who has the professional
knowledge, specialized data, and equipment to do so
properly. However, the following may be serviced by the
owner as part of routine maintenance.
CAUTION:
The carburetor was set at Yamaha factory after many
tests. If the settings are changed, poor engine
performance and damage may result.

6-23
6-23 3. Refill with the same type of brake fluid. Mixing fluids
may result in a harmful reaction and lead to poor brake
performance.
4. Be careful that water does not enter the master cylinder
when refilling. Water will significantly lower the boiling
point of the fluid and may result in vapor lock.
5. Brake fluid may deteriorate painted surfaces or plastic
parts. Always clean up spilled fluid immediately.
6. Have a Yamaha dealer check the cause if the brake
fluid level goes down.1. Complete fluid replacement should be done only by
trained service personnel.
2. Have a Yamaha dealer replace the following
components during periodic maintenance or when they
are damaged or leaking.
a. Replace all rubber seals every two years.
b. Replace all hoses every four years. Brake fluid replacement
3. Refill with the same type of brake fluid. Mixing fluids
may result in a harmful reaction and lead to poor brake
performance.
4. Be careful that water does not enter the master cylinder
when refilling. Water will significantly lower the boiling
point of the fluid and may result in vapor lock.
5. Brake fluid may deteriorate painted surfaces or plastic
parts. Always clean up spilled fluid immediately.
6. Have a Yamaha dealer check the cause if the brake
fluid level goes down.1. Complete fluid replacement should be done only by
trained service personnel.
2. Have a Yamaha dealer replace the following
components during periodic maintenance or when they
are damaged or leaking.
a. Replace all rubber seals every two years.
b. Replace all hoses every four years. Brake fluid replacement

6-26
6-26Cable inspection and lubrication Drive chain lubrication
The chain consists of many parts which work with each
other. If the chain is not maintained properly, it will wear out
quickly. Therefore, the chain must be serviced regularly.
This service is especially necessary when riding in dusty
areas.
1. Use Yamaha Chain and Cable Lube or any brands of
spray-type chain lubricant. First, remove all dirt and mud
from the chain with a brush or cloth, then spray lubricant
between both rows of side plates and on all center
rollers. The chain should be lubricated every 500 km
(300 mi).
2. To clean the chain, remove it from the machine, dip it
in solvent, and clean out as much dirt as possible. Take
the chain out of the solvent and dry it. Immediately
lubricate the chain to prevent it from rusting.Damage to the outer housing of cables may allow
internal rusting and cause interfere with cable
movement. Replace damaged cables as soon as
possible to prevent unsafe conditions.
Lubricate the inner cable and the cable end. If it does not
operate smoothly, ask a Yamaha dealer to replace them.
RECOMMENDED LUBRICANT:
Engine oil SAE 20W50
WARNING:
Cable inspection and lubrication Drive chain lubrication
The chain consists of many parts which work with each
other. If the chain is not maintained properly, it will wear out
quickly. Therefore, the chain must be serviced regularly.
This service is especially necessary when riding in dusty
areas.
1. Use Yamaha Chain and Cable Lube or any brands of
spray-type chain lubricant. First, remove all dirt and mud
from the chain with a brush or cloth, then spray lubricant
between both rows of side plates and on all center
rollers. The chain should be lubricated every 500 km
(300 mi).
2. To clean the chain, remove it from the machine, dip it
in solvent, and clean out as much dirt as possible. Take
the chain out of the solvent and dry it. Immediately
lubricate the chain to prevent it from rusting.Damage to the outer housing of cables may allow
internal rusting and cause interfere with cable
movement. Replace damaged cables as soon as
possible to prevent unsafe conditions.
Lubricate the inner cable and the cable end. If it does not
operate smoothly, ask a Yamaha dealer to replace them.
RECOMMENDED LUBRICANT:
Engine oil SAE 20W50
WARNING:

6-30
6-30
This shock absorber contains highly pressurized
nitrogen gas. Read and understand the following
information before handling the shock absorber. The
manufacturer cannot be held responsible for property
damage or personal injury that may result from improper
handling.
1. Do not tamper with or attempt to open the cylinder
assembly.
2. Do not subject the shock absorber to an open flame
or other high heat source. This may cause the unit
to explode due to excessive gas pressure.
3. Do not deform or damage the cylinder in any way.
Cylinder damage will result in poor damping
performance.
4. Take your shock absorber to a Yamaha dealer for
any service.
Rear shock absorber adjustment
The spring prelod of the rear shock absorber can be adjusted
to suit rider’s preference, weight and course condition.
Turn the adjusting ring in direction
to increase spring
preload and in direction  to decrease spring preload. Make
sure that the appropriate notch in the adjusting ring is aligned
with the position indicator on the rear shock absorber.


&  '  
WARNING:
ADJUSTING
POSITIONSOFT STANDARD HARD
12 3 765 4
This shock absorber contains highly pressurized
nitrogen gas. Read and understand the following
information before handling the shock absorber. The
manufacturer cannot be held responsible for property
damage or personal injury that may result from improper
handling.
1. Do not tamper with or attempt to open the cylinder
assembly.
2. Do not subject the shock absorber to an open flame
or other high heat source. This may cause the unit
to explode due to excessive gas pressure.
3. Do not deform or damage the cylinder in any way.
Cylinder damage will result in poor damping
performance.
4. Take your shock absorber to a Yamaha dealer for
any service.
Rear shock absorber adjustment
The spring prelod of the rear shock absorber can be adjusted
to suit rider’s preference, weight and course condition.
Turn the adjusting ring in direction
to increase spring
preload and in direction  to decrease spring preload. Make
sure that the appropriate notch in the adjusting ring is aligned
with the position indicator on the rear shock absorber.


&  '  
WARNING:
ADJUSTING
POSITIONSOFT STANDARD HARD
12 3 765 4

6-37
6-37
Front wheel removal

!
 




CAUTION:
It is advisable to have a Yamaha dealer service the
wheel.
Securely support the motorcycle so there is no danger
of it falling over.
1. Place a stand under the engine to raise the fornt wheel
off the ground.
2. Remove the speedometer cable.
3. Remove the axle nut and axle.
NOTE:
Do not depress the brake lever when the disc is off the
caliper as the brake pads will be forced shut.
Front wheel removal

!
 




CAUTION:
It is advisable to have a Yamaha dealer service the
wheel.
Securely support the motorcycle so there is no danger
of it falling over.
1. Place a stand under the engine to raise the fornt wheel
off the ground.
2. Remove the speedometer cable.
3. Remove the axle nut and axle.
NOTE:
Do not depress the brake lever when the disc is off the
caliper as the brake pads will be forced shut.

6-39
6-39
Rear wheel removal

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 2!

It is advisable to have a Yamaha dealer service the
wheel.
Securely support the motorcycle so there is no danger
of it falling over.
1. Remove the brake adjuster.
2. Remove the brake rod from the brake cam lever.
3. Loosen the axle nut.
4. Elevate the rear wheel by placing a stand under the
engine.
5. Remove the axle nut.
6. Push the wheel forward and remove the drive chain.
NOTA:
There is no need of disassembling the drive chain to
remove or reinstall the rear wheel.
7. Pull out the axle and remove the wheel assembly by
pulling backward.
CAUTION:
Rear wheel removal

!&
  

. 


 2!

It is advisable to have a Yamaha dealer service the
wheel.
Securely support the motorcycle so there is no danger
of it falling over.
1. Remove the brake adjuster.
2. Remove the brake rod from the brake cam lever.
3. Loosen the axle nut.
4. Elevate the rear wheel by placing a stand under the
engine.
5. Remove the axle nut.
6. Push the wheel forward and remove the drive chain.
NOTA:
There is no need of disassembling the drive chain to
remove or reinstall the rear wheel.
7. Pull out the axle and remove the wheel assembly by
pulling backward.
CAUTION:

6-41
6-41 Troubleshooting
Although Yamaha motorcycles receive a rigid inspection
before shipment from the factory, trouble may occur during
operation. Any problem in the fuel, compression, or ignition
systems can cause poor starting and loss of power. The
troubleshooting chart describes a quick, easy, procedure
for making checks. If your motorcycle requires any repair,
bring it to a Yamaha dealer. The skilled technicians at a
Yamaha dealership have the tools, experience, and know-
how to properly service your motorcycle. Use only genuine
Yamaha parts on your motorcycle. Imitation parts may look
like Yamaha parts, but they are often inferior. Consequently,
they have a shorter service life and can lead to expensive
repair bills.
Troubleshooting
Although Yamaha motorcycles receive a rigid inspection
before shipment from the factory, trouble may occur during
operation. Any problem in the fuel, compression, or ignition
systems can cause poor starting and loss of power. The
troubleshooting chart describes a quick, easy, procedure
for making checks. If your motorcycle requires any repair,
bring it to a Yamaha dealer. The skilled technicians at a
Yamaha dealership have the tools, experience, and know-
how to properly service your motorcycle. Use only genuine
Yamaha parts on your motorcycle. Imitation parts may look
like Yamaha parts, but they are often inferior. Consequently,
they have a shorter service life and can lead to expensive
repair bills.