Yamaha YZ125X 2023, Owner'S Manual

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MAINTENANCE INTERVALS
3-2
10 * Rotor nut (flywheel
magneto)
• Tighten.
 
11 * Kickstarter system
• Check idle gear for damage.
• Replace if necessary.

12 * Exhaust system
• Check exhaust pipe and muffler
for carbon deposits.
 
• Clean. 
13 * Crankshaft
• Check crankshaft for carbon
deposits and damage.
 
•
Clean.
 
14 * Carburetor
• Check carburetor settings and for
obstructions.
 
• Adjust and clean.  
15 Spark plug
• Check condition.
• Clean and regap.
 
• Replace. 
16
* Drive chain
•
Check chain slack, alignment and
condition.
• Adjust and thoroughly lubricate
chain with Yamaha chain and
cable lube or equivalent.
 
•
Replace.

17 * Cooling system
• Check coolant level and for leak-
age.
 
• Check hoses for cracks or dam-
age.

• Check radiator cap spring opera-
tion.

• Change coolant. Every 2 years 
18 * Chassis fasteners
•
Check all chassis fitting and fas-
teners.
•
Correct or tighten if necessary.
 
19
Air filter element
• Clean.  
•
Replace.

20
* Frame
•
Clean and check for damage.
 
21 * Fuel line • Clean and check for leakage.  
22 * Brakes
• Adjust lever position and pedal
position.
•
Lubricate pivot points.
• Check brake disk surface.
• Check fluid level and for leakage.
•
Tighten brake disk bolts, caliper
bolts, master cylinder bolts and
union bolts.
 
• Replace brake pads. 
•
Replace brake fluid. Every year

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