Yamaha YZ125X 2023, Owner'S Manual

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MAINTENANCE INTERVALS
3-1
EAM20157
MAINTENANCE INTERVALS
EAM30369
MAINTENANCE INTERVALS
NOTICE
ECA25871
• After a break-in or before each race, always check the points shown in “TORQUE-CHECK
POINTS” for tightening torques and retighten them.
• Periodic inspection is essential in making full use of the machine performance. The life of
parts varies significantly according to the environment in which the machine runs (e.g., rain,
dirt, etc.). Therefore, earlier inspection is required by reference to the list below.
TIP
Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,
data and technical skills.
No. Item Routine
After
break-in
Every
race
(about 2.5
hours)
Every
third race
(about 7.5
hours)
Every
fifth race
(about 12.5
hours)
As
required
1
* Piston
•
Check piston for carbon deposits
and cracks or damage.
•
Clean.
 
•
Replace.
 
2
* Piston rings
•
Check piston ring end gap and
rings for damage.
 
•
Replace.
 
3
* Piston pin and small
end bearing
•
Check piston pin and small end
bearing for damage.

•
Replace.

4
* Cylinder head
•
Check cylinder head for carbon
deposits.
•
Clean.
 
•
Check cylinder head gasket for
damage.
•
Tighten cylinder head nuts if nec-
essary.
 
•
Replace cylinder head gasket.

5
* Cylinder
•
Check cylinder for score marks or
wear.
•
Clean.
 
•
Replace.

6
* YPVS
•
Check YPVS for carbon deposits
and cracks or damage.
 
•
Clean.
 
7
* Clutch
•
Check clutch housing, friction
plates, clutch plates and clutch
springs for wear or damage.
•
Adjust.
 
•
Replace.

8
* Transmission
•
Change the transmission oil.
 
•
Check transmission for damage.

•
Replace bearings.

9
* Shift forks, guide
bars, shift cam
•
Check all parts for wear and dam-
age.
•
Replace if necessary.
