Yamaha Xt 125 X Manual

11
IDM C144600300.fm
TECHNICAL SPECIFICATIONSSPEC
   
Brakes:
Type of Front BrakeDisc brake with hydraulic drive
Front Brake OperationRight hand
Type of Rear BrakeDisc brake with hydraulic drive
Rear Brake OperationRight foot
Suspensions:
FrontHydraulic fork
RearSwinging arm with hydraulic shock absorber
Shock Absorbing System:
FrontCoil spring / Oil damper
RearCoil spring / Oil damper
Wheel Stroke:
Front Wheel Stroke170 mm (6.69 in)170 mm (6.69 in)
Rear Wheel Stroke190 mm (7.48 in)190 mm (7.48 in)...

12
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
SERVICING TECHNICAL DATA
ENGINE
PictureDescriptionStandardLimit
Cylinder Head:
Planarity Error
The lines indicate the 
points for the planarity  measures.
0.03 mm
Cylinder:
Hole size54.00~54.020 mm-
Cylinder:Hole size54.00~54.020 mmPiston:
Piston Diameter  (D)53.977~53.996 mm-
Measure Point (H)4.5 mm-
Piston/Cylinder Clearance0.020~0.028 mm0.15 mm
Hole diameter   (F)15.002~15.013 mm-
Pin Diameter14.991~15.000 mm-
Timing System:
Type of DriveChain drive-...

13
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
Exhaust Valve Width (B) 1.7~2.8 mm-
Valve Housing Width  (C) 0.9~1.1 mm1.6 mm
Inlet Valve Thickness  (D) 0.4~0.8 mm-
Exhaust Valve Thickness  (D) 0.8~1.2 mm-
Diameter of Inlet Valve Stem 4.975~4.990 mm4.950 mm
Diameter of Exhaust Valve Stem4.960~4.975 mm4.935 mm
Diameter of Inle t Valve Guides 5.000~5.012 mm5.042 mm
Clearance of Inlet valve Guide/Stem0.010~0.037 mm0.08 mm
Clearance of Exhaust Valve Guide/Stem0.025~0.052 mm0.10 mm
Valve Stem...

14
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
Clutch:
Clutch Disc Thickness (conductors)2.92~3.08 mm2.80 mm
Quantity5 pcs-
Clutch Disc Thickness (conduced)1.05~1.35 mm0.05 mm
Quantity4 pcs-
Clutch Spring Free Length 31 mm-
Quantity4 pcs-
Min. Free Length29 mm-
Carburettor:
ID Mark3D6-
Main Jet#105-
Main Air Jet1.2-
Jet Pin5EJ9-2-
Jet NeedleN-7M(913)-
Min. Outputf1.05-
Min. Jet#12.5-
Bypass1.6-
Adjusting Screw Rev1-
Valve Housing Dimensions1.8-
Starter Jet22.5-
Jet Power#60-
Fuel Level7.5 mm-
Float...

15
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
LUBRICATION DIAGRAMS
IDM-44600300900.tif
Compensator Arm(Suction)
Compensator Arm 
(Exhaust)
Compensator 
ShaftCam Shaft
Crankcase (right) 
Clutch Lever
Oil Suction 
Filter
Oil Pump Centrifugal Filter
Motor Oil inCrankcase
Motor Axis
Main Axis
 Do not damage the crankcase surface to avoid oil leakage.CAUTION: 

16
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
IDM-44600301000.tif
Cam Shaft
Centrifugal Filter
Crankcase
Main Axis
Clutch
Cover (Right)
Chain Guard 
(Right)
Cover (Left)
Motor Axis
Chain Guard(Left)
To enhance performance,  always use “Yamalube”  oil.CAUTION:
Cylinder Head
Cylinder 

17
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
ENGINE TIGHTENING TORQUES
Components To Be TightenedTypeQ.tyThreadTightening TorqueNotesKg*mN
*m
Cylinder HeadScrew
Screw4
2M8
M62.2
1.022
10Oil check
Plug-1M101.2512.5
Cylinder Head Side GuardScrew2M61.010
Valve Cap-2M451.7517.5
Magnet RotorScrew1M127.070
Chain GuideScrew1M61.010
Adjusting ScrewNut2M50.757.5
Timing Chain PinionScrew1M82.020
Camshaft Locking PlateScrew1M61.010
Plug (Turnbuckle)Plug1M80.757.5
Turnbuckle UnitScrew2M61.010
Oil...

18
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
FRAME
DetailStandardLimit
XT 125RXT 125XXT 125RXT 125X
Front Wheel:
TypeSpoked wheelSpoked wheel
Rim Dimensions21x1.8517x2.50
Rim MaterialAluminiumAluminium
Stroke170 mm (6.69’’)170 mm (6.69’’)
Max. Radial Clearance1 mm1 mm
Max. Side Clearance0.5 mm0.5 mm
Rear Wheel:
TypeSpoked wheelSpoked wheel
Rim Dimensions18x2.5017x3.00
Rim MaterialAluminiumAluminium
Stroke190 mm (7.48)190 mm (7.48”)
Max. Radial Clearance1 mm (0.04)1 mm (0.04)
Max. Side Clearance0.5...

19
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
Front Suspension:
Fork Free Length575 mm
Spring Stiffness K14.8 N/mm
Spring Stroke K1 (Packed Spring)250 mm
Available Optional SpringNO
Recommended OilSAE10
Quantity 285 cc/Rod
Level180 mm (limit stop, with no spring)
Rear Suspension:
TypeSwinging Arm
Rear Shock Absorber Compression45 mm
Spring Free Length163 mm
Spring Length when Installed158 mm
Spring PreloadHard/Soft (5 mm)
Spring Stiffness (K)17.7 daN/mm
Spring Stroke55 mm
Available Optional...

20
IDM C144600300.fm
SERVICING TECHNICAL DATASPEC
FRAME TIGHTENING TORQUES
Components To Be TightenedTypeQ.tyThreadTightening TorqueNoteskg*mN
*m
Front Wheel PinScrew1M14x1.54.545
Front Wheel Pin LockingScrew1M8x252.020
Front Brake PliersScrew2M83.030
Muffler Side ConnectionScrew3M60.88
Engine Rear Connection Screw2M82.323
Fork PinScrew1M14x1.56.060
Engine Front ConnectionScrew2M82.323
Front Pump Clamp Screw2M60.66
Rear WheelScrew1M14x1.58.585
Command ClampScrew2M60.33
Rear Shock AbsorberScrew2M104.545...