2005-2021 Yamaha YZ125Maintenance schedule

Motocross - 125cc two-stroke

Scheduled against races ridden and approximate engine hours (2.5 h per race).

Verified

Every interval on this page was read directly from the OEM chart.

Intervals

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

Full schedule (65 items)

2005-2021 Yamaha YZ125 scheduled maintenance items and intervals
Item	Action	Interval
AIR FILTER Clean and lubricate	Clean, Lubricate	Every 2.5 hrs Also marked: After break-in
AND DUST SEAL Clean and lube	Clean	Every 2.5 hrs Also marked: After break-in
BEARING Inspect	Inspect	Every 2.5 hrs
BLE Check routing and connection	Inspect	Every 2.5 hrs Also marked: After break-in
BLE Lubricate	Lubricate	Every 2.5 hrs Also marked: After break-in
BOLTS Retighten	Inspect	Every 2.5 hrs Also marked: After break-in
BRAKES Adjust lever position and pedal height	Adjust	Every 2.5 hrs Also marked: After break-in
BRAKES Lubricate pivot point	Lubricate	Every 2.5 hrs Also marked: After break-in
BRAKES Check brake disc surface	Inspect	Every 2.5 hrs Also marked: After break-in
BRAKES Check fluid level and leakage	Inspect	Every 2.5 hrs Also marked: After break-in
BRAKES Retighten brake disc bolts, caliper bolts, master cylinder bolts and union bolts	Inspect	Every 2.5 hrs Also marked: After break-in
CARBURETOR Inspect, adjust and clean	Clean, Adjust	Every 2.5 hrs Also marked: After break-in
CLUTCH Inspect and adjust	Adjust	Every 2.5 hrs Also marked: After break-in
COOLING SYSTEM Check coolant level and leakage	Inspect	Every 2.5 hrs Also marked: After break-in
COOLING SYSTEM Inspect hoses	Inspect	Every 2.5 hrs
CYLINDER Inspect and clean	Clean	Every 2.5 hrs Also marked: After break-in
CYLINDER HEAD Inspect and clean	Clean	Every 2.5 hrs Also marked: After break-in
CYLINDER HEAD Retighten	Inspect	Every 2.5 hrs Also marked: After break-in
DRIVE CHAIN Lubricate, slack, alignment	Lubricate	Every 2.5 hrs Also marked: After break-in
FRAME Clean and inspect	Clean	Every 2.5 hrs Also marked: After break-in
FRONT FORKS Inspect and adjust	Adjust	Every 2.5 hrs Also marked: After break-in
ING ROD Inspect, lube and retighten	Inspect	Every 2.5 hrs Also marked: After break-in
MUFFLER Inspect	Inspect	Every 2.5 hrs Also marked: After break-in
MUFFLER Retighten	Inspect	Every 2.5 hrs Also marked: After break-in
PISTON Inspect and clean	Clean	Every 2.5 hrs Also marked: After break-in
PISTON RING Inspect	Inspect	Every 2.5 hrs Also marked: After break-in
REAR SHOCK ABSORBER Inspect and adjust	Adjust	Every 2.5 hrs Also marked: After break-in
REAR SHOCK ABSORBER Retighten	Inspect	Every 2.5 hrs Also marked: After break-in
ROLLERS Inspect	Inspect	Every 2.5 hrs Also marked: After break-in
STEERING HEAD Inspect free play and retighten	Inspect	Every 2.5 hrs Also marked: After break-in
SWINGARM Inspect, lube and retighten	Inspect	Every 2.5 hrs Also marked: After break-in
TIRE, WHEELS Inspect air pressure, wheel run-out, tire wear and spoke looseness	Inspect	Every 2.5 hrs Also marked: After break-in
TIRE, WHEELS Retighten sprocket bolt	Inspect	Every 2.5 hrs Also marked: After break-in
YPVS Inspect and clean	Clean	Every 2.5 hrs Also marked: After break-in
FUEL TANK, COCK Clean and inspect	Clean	Every 7.5 hrs Also marked: After break-in
PISTON RING Replace	Replace	Every 7.5 hrs Also marked: As required
REAR SHOCK ABSORBER Lube	Inspect	Every 7.5 hrs Also marked: As required
SPARK PLUG Inspect and clean	Clean	Every 7.5 hrs Also marked: After break-in
TIRE, WHEELS Inspect bearings	Inspect	Every 7.5 hrs
TIRE, WHEELS Lubricate	Lubricate	Every 7.5 hrs
CRANK Inspect and clean	Clean	Every 12.5 hrs Also marked: As required
FRONT FORKS Replace oil	Replace	Every 12.5 hrs Also marked: After break-in
MUFFLER Clean	Clean	Every 12.5 hrs
PISTON Replace	Replace	Every 12.5 hrs Also marked: As required
ROTOR NUT Retighten	Inspect	Every 12.5 hrs Also marked: After break-in
STEERING HEAD Clean and lube	Clean	Every 12.5 hrs
TRANSMISSION Replace oil	Replace	Every 12.5 hrs Also marked: After break-in
AIR FILTER Replace	Replace	One time Also marked: As required
BEARING Replace	Replace	One time Also marked: As required
BRAKES Replace pads	Replace	One time Also marked: As required
BRAKES Replace brake fluid	Replace	One time Also marked: As required
CLUTCH Replace	Replace	One time Also marked: As required
COOLING SYSTEM Check radiator cap operation	Inspect	One time Also marked: As required
COOLING SYSTEM Replace coolant	Replace	One time Also marked: As required
CYLINDER Replace	Replace	One time Also marked: As required
DRIVE CHAIN Replace	Replace	One time Also marked: As required
FRONT FORKS Replace oil seal	Replace	One time Also marked: As required
GUIDE BAR Inspect	Inspect	One time Also marked: As required
MUFFLER Replace fiber	Replace	One time Also marked: As required
PROTECTOR GUIDE Replace	Replace	One time Also marked: As required
SPARK PLUG Replace	Replace	One time Also marked: As required
STEERING HEAD Replace bearing	Replace	One time Also marked: As required
TIRE, WHEELS Replace bearings	Replace	One time Also marked: As required
TRANSMISSION Inspect	Inspect	One time Also marked: As required
TRANSMISSION Replace bearing	Replace	One time Also marked: As required

Every row above is factory schedule, straight from the chart. Intervals are shown in hrs.

Specs

From the 2015 manual's technical data section. Check yours before buying — these change between model years.

Displacement: 125 cm3 (4.40 Imp oz, 4.23 US oz)
Bore × stroke: 54.0 × 54.5 mm (2.1 × 2.1 in)
Spark plug: TMX
Plug gap: 0.6–0.7 mm (0.024–0.028 in)
Engine oil: periodic change: 0.66 L (0.58 Imp qt, 0.70 US qt)
total: 0.70 L (0.62 Imp qt, 0.74 US qt)
Coolant: capacity: 0.90 L (0.79 Imp qt, 0.95 US qt)
Fuel: tank: 8.0 L (1.8 Imp gal, 2.1 US gal)
Tire pressure (cold): front: 100 kPa (1.00 kgf/cm2, 15 psi)
rear: 100 kPa (1.00 kgf/cm2, 15 psi)
Secondary reduction: 3.692 (48/13)

Legend

Y — Service this item at this interval (marked in the OEM chart)

Chart notes

1. Items marked with an asterisk in the manual should be performed by a Yamaha dealer - they need special tools, data and technical skills.
2. Calendar items (coolant every two years, brake fluid every year, fuel hose every four years) sit in the Remarks column, not in the race columns.

From the manual

Service life of parts varies significantly with the environment the machine runs in (rain, dirt); inspect earlier if conditions are harsh.
Periodic inspection is essential to make full use of machine performance.

Source: 2015 Yamaha YZ125 Owner's Service Manual · Chart read from the 2015 manual. Intervals change between model years — confirm against yours.

Always confirm intervals, torque specs and part numbers against your own service manual. This site is a shopping aid, not a repair manual.

Open the hour meter tool