2005 YAMAHA XTZ125 fuel

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.

6-41
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.

6-42
6-42 Troubleshooting chart
ADVERTENC
Never check the fuel system while smoking or in the
vicinity of an open flame.
WARNING:
Check if there is
fuel in the fuel tank
Use electric
starter
Remove spark plug
and check
electrode
Use electric starter 1. Fuel
2. Compression
3. Ignition
4. Battery *Enough fuel
No fuel
There is compression
No compression
Wet
Dry
Engine turns
over quickly
Engine turns
over slowlySupply fuel
Go to ignition check
Ask Yamaha dealer to inspect
Wipe clean with dry cloth and correct
spark plug gap or replace spark plugs
Ask Yamaha dealer to inspect
Battery good
Check fluid, recharge
and check
connections
Go to compression
check
Engine doesn’t start, go to
compression check
Open the throttle hal-way
and start the engine
Engine doesn’t start, ask
Yamaha dealer to inspect.Engine doesn’t start,
go to battery check
* Obs.: XTZ 125E
Troubleshooting chart
ADVERTENC
Never check the fuel system while smoking or in the
vicinity of an open flame.
WARNING:
Check if there is
fuel in the fuel tank
Use electric
starter
Remove spark plug
and check
electrode
Use electric starter 1. Fuel
2. Compression
3. Ignition
4. Battery *Enough fuel
No fuel
There is compression
No compression
Wet
Dry
Engine turns
over quickly
Engine turns
over slowlySupply fuel
Go to ignition check
Ask Yamaha dealer to inspect
Wipe clean with dry cloth and correct
spark plug gap or replace spark plugs
Ask Yamaha dealer to inspect
Battery good
Check fluid, recharge
and check
connections
Go to compression
check
Engine doesn’t start, go to
compression check
Open the throttle hal-way
and start the engine
Engine doesn’t start, ask
Yamaha dealer to inspect.Engine doesn’t start,
go to battery check
* Obs.: XTZ 125E

7-2
7-2 B. Storage
Long term storage (30 days or more) of your machine will
require some preventive procedures to guard against
deterioration. After thoroughly cleaning the machine,
prepare for storage as follows:
1. Drain the fuel tank, fuel lines, and carburetor float
bowl(s).
2. Remove the spark plug(s), pour about one tablespoon
of SAE 20W50 motor oil in the spark plug hole(s) and
reinstall the spark plug(s).
Crank the engine over several times (with the
ignition off) to coat the cylinder walls with oil.
3. Remove the drive chain. Clean it thoroughly with
solvent and lubricate it.
Reinstall the chain or store it in a plastic bag
(tied to frame for safe-keeping).
4. Lubricate all control cables.
5. Block up the frame to raise both wheels off the
ground.
6. Tie a plastic bag over the exhaust pipe outlet to
prevent moisture from entering.7. If storing in a humid or salt-air atmosphere, coat
all exposed metal surfaces with a light film of
oil. Do not apply oil to any rubber parts or the
seat cover.
8. Remove the battery and charge it. Store it in a dry place
and recharge it once a month. Do not store the battery
in an excessively warm or cold place (less than 0ºC
(30ºF) or more than 30ºC (90ºF).
NOTE:
Make any necessary repairs before storing the machine.
B. Storage
Long term storage (30 days or more) of your machine will
require some preventive procedures to guard against
deterioration. After thoroughly cleaning the machine,
prepare for storage as follows:
1. Drain the fuel tank, fuel lines, and carburetor float
bowl(s).
2. Remove the spark plug(s), pour about one tablespoon
of SAE 20W50 motor oil in the spark plug hole(s) and
reinstall the spark plug(s).
Crank the engine over several times (with the
ignition off) to coat the cylinder walls with oil.
3. Remove the drive chain. Clean it thoroughly with
solvent and lubricate it.
Reinstall the chain or store it in a plastic bag
(tied to frame for safe-keeping).
4. Lubricate all control cables.
5. Block up the frame to raise both wheels off the
ground.
6. Tie a plastic bag over the exhaust pipe outlet to
prevent moisture from entering.7. If storing in a humid or salt-air atmosphere, coat
all exposed metal surfaces with a light film of
oil. Do not apply oil to any rubber parts or the
seat cover.
8. Remove the battery and charge it. Store it in a dry place
and recharge it once a month. Do not store the battery
in an excessively warm or cold place (less than 0ºC
(30ºF) or more than 30ºC (90ºF).
NOTE:
Make any necessary repairs before storing the machine.

8-1
8-1
SPECIFICATIONS
MODEL
Dimension:
Overall length
Overall width
Overall height
Seat height
Wheet base
Minimum ground clearance
Basic weight:
With oil and without fuel:
Minimum turning radius:
Engine:
Type
Cylinder arrangement
Displacement
Bore x Stroke
Compression rate
Starting system
Lubrification system
103 Kg (227 lb)
113 Kg (249 lb) 2.090 mm (82.3 in)
810 mm (31.9 in)
1.125 mm (44.3 in)
840 mm (33.1 in)
1.340 mm (52.7 in)
265 mm (10.4 in)
2.100 mm (82.7 in)
XTZ 125K
Air cooled, 4-stroke
gasoline, SOHC
Single cylinder
123.7 cm
3
54 x 54 mm (2.13 x 2.13 in)
10.0 : 1
Kick starter
Wet sump
104 Kg (229 lb)
114 Kg (251 lb) 2.090 mm (82.3 in)
810 mm (31.9 in)
1.125 mm (44.3 in)
840 mm (33.1 in)
1.340 mm (52.7 in)
265 mm (10.4 in)
2.100 mm (82.7 in)
XTZ 125E
Air cooled, 4-stroke
gasoline, SOHC
Single cylinder
123.7 cm
3
54 x 54 mm (2.13 x 2.13 in)
10.0 : 1
Electric starter
Wet sump
SPECIFICATIONS
MODEL
Dimension:
Overall length
Overall width
Overall height
Seat height
Wheet base
Minimum ground clearance
Basic weight:
With oil and without fuel:
Minimum turning radius:
Engine:
Type
Cylinder arrangement
Displacement
Bore x Stroke
Compression rate
Starting system
Lubrification system
103 Kg (227 lb)
113 Kg (249 lb) 2.090 mm (82.3 in)
810 mm (31.9 in)
1.125 mm (44.3 in)
840 mm (33.1 in)
1.340 mm (52.7 in)
265 mm (10.4 in)
2.100 mm (82.7 in)
XTZ 125K
Air cooled, 4-stroke
gasoline, SOHC
Single cylinder
123.7 cm
3
54 x 54 mm (2.13 x 2.13 in)
10.0 : 1
Kick starter
Wet sump
104 Kg (229 lb)
114 Kg (251 lb) 2.090 mm (82.3 in)
810 mm (31.9 in)
1.125 mm (44.3 in)
840 mm (33.1 in)
1.340 mm (52.7 in)
265 mm (10.4 in)
2.100 mm (82.7 in)
XTZ 125E
Air cooled, 4-stroke
gasoline, SOHC
Single cylinder
123.7 cm
3
54 x 54 mm (2.13 x 2.13 in)
10.0 : 1
Electric starter
Wet sump

8-2
8-2
MODEL XTZ 125E and XTZ 125K
Engine oil:
Air filter:
Fuel:
Type
Tank capacity
Reserve amount
Carburetor:
Type / manufacturer
Spark plug:
Type / manufacturer
Gap
Clutch type: Capacity:
Periódic oil change
Total amount
TypeYAMALUBE 4 or SAE 20W50 type SH
Wet type element
CR7HSA / NGK or U22FSR-U / DENSO
0.7 mm (0.028 in)
Wet, multi-disc Regular unleaded gasoline
10,6
l ( 2.33 Imp gal, 2.80 US gal)
1,0
l ( 0.220 Imp gal, 0.264 US gal) 1,0
l ( 0,220 Imp gal, 0.264 US gal)
1,2 l ( 0,264 Imp gal, 0.317 US gal)
VM 20SS / Mikuni
MODELXTZ 125E and XTZ 125K
Engine oil:
Air filter:
Fuel:
Type
Tank capacity
Reserve amount
Carburetor:
Type / manufacturer
Spark plug:
Type / manufacturer
Gap
Clutch type: Capacity:
Periódic oil change
Total amount
TypeYAMALUBE 4 or SAE 20W50 type SH
Wet type element
CR7HSA / NGK or U22FSR-U / DENSO
0.7 mm (0.028 in)
Wet, multi-disc Regular unleaded gasoline
10,6
l ( 2.33 Imp gal, 2.80 US gal)
1,0 l ( 0.220 Imp gal, 0.264 US gal) 1,0
l ( 0,220 Imp gal, 0.264 US gal)
1,2 l ( 0,264 Imp gal, 0.317 US gal)
VM 20SS / Mikuni