Yamaha YZ125 Maintenance Intervals Schedule

No.ItemRoutineAfter break-inEvery race (about 2.5 hours)Every third race (about 7.5 hours)Every fifth race (about 12.5 hours)As required
1*PistonCheck piston for carbon deposits and cracks or damage.
2*Piston ringsCheck piston ring end gap and rings for damage.
3*Piston pin and small end bearingCheck piston pin and small end bearing for damage.
4*Cylinder headCheck cylinder head for carbon deposits.
Check cylinder head gasket for damage.
Tighten cylinder head nuts if necessary.
Replace cylinder head gasket.
5*CylinderCheck cylinder for score marks or wear.
6*YPVSCheck YPVS for carbon deposits and cracks or damage.
7*ClutchCheck clutch housing, friction plates, clutch plates and clutch springs for wear or damage.
8*TransmissionChange the transmission oil.
Check transmission for damage.
Replace bearings.
9*Shift forks, guide bars, shift camCheck all parts for wear and damage.
Replace if necessary.
10*Rotor nut (flywheel magneto)Tighten.
11*Kickstarter systemCheck idle gear for damage.
Replace if necessary.
12*Exhaust systemCheck exhaust pipe and muffler for carbon deposits.
13*CrankshaftCheck crankshaft for carbon deposits and damage.
14*CarburetorCheck carburetor settings and for obstructions.
Adjust and clean.
Spark plugCheck condition.
Clean and regap.
16*Drive chainCheck chain slack, alignment and condition.
Adjust and thoroughly lubricate chain with Yamaha chain and cable lube or equivalent.
17*Cooling systemCheck coolant level and for leakage.
Check hoses for cracks or damage.
Check radiator cap spring operation.
Change coolant.Every 2 years
18*Chassis fastenersCheck all chassis fitting and fasteners.
Correct or tighten if necessary.
Air filter elementClean.
20*FrameClean and check for damage.
21*Fuel lineClean and check for leakage.
22*BrakesAdjust 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
23*Front forkCheck operation and for oil leakage.
Adjust if necessary.
Clean dust seal and lubricate with lithium-soap-based grease.
Replace fork oil.
Replace oil seals.
Replace protector seal.
24*Shock absorber assemblyCheck operation and adjust.
Tighten if necessary.
Lubricate with lithium-soap-based grease.
(After washing the motorcycle or riding in the rain)
25*Drive chain roller and support guideCheck for wear or damage.
Replace if necessary.
26*Rear suspensionCheck operation and tighten if necessary.
Lubricate with molybdenum disulfide grease.
27*Swingarm pivot bearingsCheck bearing assemblies for looseness.
Lubricate with molybdenum disulfide grease.
28*Steering headCheck operation, free play, and tighten if necessary.
Clean and lubricate with lithium-soap-based grease.
Replace bearings.
29*Tires and wheelsCheck tire air pressure, wheel runout, spokes for looseness, and tires for wear.
Tighten sprocket bolts if necessary.
Check wheel bearings for looseness.
Lubricate wheel bearings with lithium-soap-based grease.
Replace wheel bearings.
30*Moving parts and cablesLubricate.
31*Throttle gripCheck operation.
Check throttle grip free play, and adjust if necessary.
Lubricate cable and grip housing.