Yamaha Xt 125 X Manual

IDM C144600300.fm
2005
XT 125R
XT 125X
SERVICE 
INFORMATION 

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IDM C144600300.fm
WARNING
This Manual has been written by Yamaha Motor and is addressed to Yamaha vendors and their qualified 
engineers. This Manual cannot cover any aspect of mechanical knowledge; therefore, anyone who will refer to this 
manual is expected to have a basic knowledge of the mechanical skills required for servicing and repairing Yamaha 
motorcycles. Repairing performed by unskilled personnel may cause motorcycles to be unserviceable and 
dangerous.
Yamaha Motor is constantly searching...

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IDM C144600300.fm
GRAPHIC SYMBOLS
Symbols   to   are drawn as tabs to indicate the 
chapter number and its content.
 General Information
 Technical Specifications
 Scheduled Servicing and Adjustment
 Engine
 Carburetion
 Frame
 Electrical System
 Troubleshooting
Symbols 
 to  are used to identify technical
specifications stated in this Manual.
 Repairing Possible with Engine in Place
 Filling Up
 Lubricant
 Special Components
 Tightening
 Wear Limit, Distance
 Engine RPM
 
Ω, V, A (to be measured with...

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IDM C144600300.fm
INDEX
GENERAL INFORMATION ......................................................................................................6
IDENTIFICATION OF THE MOTORCYCLE .........................................................................6
SPECIAL COMPONENTS  ....................................................................................................7
TECHNICAL SPECIFICATIONS ..............................................................................................9
GENERAL...

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GENERAL INFORMATION
GEN
INFO
GENERAL INFORMATION
IDENTIFICATION OF THE MOTORCYCLE
Serial Number of the Frame
The Serial Number of the frame   is 
marked on the metal tube of the 
handlebar.
NOTE: The Serial Number of the 
frame is used for the motorcycle 
identification and registration.
Serial Number of the Engine
The Serial Number of the Engine   is 
marked on the right side of the 
crankcase.
NOTE: The first three figures of this 
Serial Number identify the 
motorcycle model; the...

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GENERAL INFORMATION
GEN
INFO
SPECIAL COMPONENTS
The special components listed below are required for a complete and accurate tuning and assembly of the 
motorcycle. The use of proper special instruments prevents damages caused by improper instruments or made-
up techniques. 
When ordering a special component, please refer to the list below to avoid any mistake.
Component N.DescriptionPicture
90890-01312Fuel Indicator
The fuel indicator is used to measure the fuel level in the...

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IDM C144600300.fm
GENERAL INFORMATION
GEN
INFO
(*) Indications from Yamaha are required about the compatibility of the components above. If they are not compatible, ID codes and drawings 
of new components are required. Otherwise, Yamaha should state which components are to be excluded from this Manual.
90890-01274 (1)
90890-01275 (2)
90890-01278 (3)Tool for Drive Shaft Installation
Drive Shaft Pin
Adaptor (M12)
(*) 90890-01326T-t oo l
The T-tool is used to hold the shock absorber rod when it 
is...

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TECHNICAL SPECIFICATIONSSPEC
TECHNICAL SPECIFICATIONS
GENERAL FEATURES
ModelXT 125RXT 125X
Dimensions:
Overall Length2110 mm2040 mm
Overall Width860 mm860 mm
Overall Height1130 mm1090 mm
Saddle Height860 mm830 mm
Pitch1340 mm1340 mm
Min. Distance from the Ground300 mm271 mm
Min. Turning Radius 2100 mm2016 mm
Net Weight:
Oil and Fuel Included120 kg120 kg
Engine:
Type of Engine:4-stroke, air-cooling
Feeding SystemCarburettor
Cylinder ArrangementTilted forward, single-cylinder...

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IDM C144600300.fm
TECHNICAL SPECIFICATIONSSPEC
Carburettor:
Type/QuantityVM20SS
ManufacturerMIKUNI
Spark Plugs:
TypeCR7HSA
ManufacturerNGK
Distance between Electrodes0.6 mm (0.0236 in)
Type of Clutch:Oil-bath, multiple disc
Gear:
Primary Step-down SystemWorm gear
Primary Step-down Ratio68/20 (1/3,4)
Secondary Step-down RatioDrive chain
Secondary Step-down Ratio50/14 (3.5715)48/14 (3.4286)
Type of GearContinuous gear, 5-speed
OperationLeft foot
Drive Ratio:
First Gear14/37 (2.64)
Second Gear18/32...