Yamaha YZ125 2017 Maintenance Schedule
The 2017 Yamaha YZ125 maintenance schedule below covers the manufacturer's recommended service intervals for general maintenance, coolant, spark plugs, drive chain maintenance, air filter, tires, oil and brake fluid. Intervals are shown in kilometres by default and can be switched to miles.
124ccEngine size
37Maintenance items
Official manufacturer manual
Sourced from ManualsLib (Yamaha Owner's Service Manual scan) (this document covers model years 2000–2025): manualslib.com
Full schedule
| Task | Interval | Difficulty | Notes |
|---|---|---|---|
| Piston pin & small-end bearing inspection & replacement | Every 2 operating hours | Advanced | Inspect piston pin and connecting-rod small-end needle bearing for damage or wear; replace as required. |
| Transmission inspection & bearing replacement | See notes | Advanced | Inspect transmission gears and shafts for damage; replace bearings as required. |
| Shift fork, shift cam & guide bar inspection | See notes | Advanced | Inspect shift forks, shift cam and guide bar for wear or damage. |
| Crankshaft inspection & cleaning | Every 12 operating hours | Expert | Inspect crankshaft for carbon deposits and damage; clean. |
| Coolant replacement | Every 24 months | Easy–Moderate | Drain and replace engine coolant. |
| Brake pad replacement | See notes | Moderate | Replace front and/or rear brake pads. |
| Front fork inspection, adjustment & oil/seal replacement | Every 2 operating hours · Replace every 12 km | Advanced | Inspect fork operation and check for oil leakage; adjust compression/rebound as needed. Replace fork oil (Suspension oil "01"/"S1") and oil seals. |
| Front fork dust seal cleaning & lubrication | Every 2 operating hours | Moderate | Clean fork dust seal and lubricate with lithium-soap-based grease. |
| Fork protector guide replacement | See notes | Easy | Replace fork protector/guard seals. |
| Rear shock spring seat replacement | Every 12 months | Moderate | Replace the rear shock spring seat. |
| Wheel bearing inspection, lubrication & replacement | Every 7 operating hours | Moderate | Inspect wheel bearings for looseness; lubricate with lithium-soap-based grease. Replace worn bearings. |
| Piston inspection, cleaning & replacement | Every 2 operating hours · Replace every 12 km | Advanced | Inspect piston crown for carbon deposits, cracks, or damage; clean carbon. Replace piston, piston pin and small-end bearing as a set when worn. |
| Piston ring inspection & replacement | Every 2 operating hours · Replace every 7 km | Advanced | Check piston ring end gap; inspect rings for damage. Replace rings when end gap exceeds service limit. |
| Cylinder head inspection, cleaning & retightening | Every 2 operating hours | Moderate | Inspect cylinder head for carbon deposits and clean (decarbon); check head gasket condition; retighten cylinder head nuts to spec. |
| Cylinder bore inspection, cleaning & replacement | Every 2 operating hours | Expert | Inspect cylinder bore for score marks and wear; clean. Rebore or replace cylinder as required. |
| Power valve (YPVS) inspection, cleaning & decarbonization | Every 2 operating hours | Moderate | Inspect YPVS power-valve mechanism and exhaust port for carbon deposits, cracks or damage; clean/decarbonize. |
| Clutch inspection, adjustment & replacement | Every 2 operating hours | Moderate | Inspect clutch housing, friction plates, clutch plates and springs for wear or damage; adjust. Replace worn components as required. |
| Rotor nut (flywheel) retightening | Every 12 operating hours | Easy | Retighten the flywheel/rotor nut to specified torque. |
| Muffler/exhaust inspection, cleaning & retightening | Every 2 operating hours | Easy | Inspect exhaust pipe/muffler for carbon deposits; clean. Retighten muffler mounting bolts. |
| Carburetor inspection, adjustment & cleaning | Every 2 operating hours | Moderate | Inspect carburetor settings and check for obstructions; adjust and clean. |
| Spark plug inspection, cleaning & replacement | Every 2 operating hours | Easy | Inspect spark plug condition and gap; clean and regap (NGK BR9EG). Replace as required. |
| Drive chain lubrication, slack & alignment check / replacement | Every 2 operating hours | Easy | Check drive chain slack, alignment and condition; lubricate with chain lube. Chain slack spec: 48-58 mm (1.9-2.3 in). Replace chain as required. |
| Coolant level, hose & radiator cap inspection | Every 2 operating hours | Easy–Moderate | Check coolant level and for leakage; inspect hoses for cracks/damage; check radiator cap spring operation. |
| Outside nuts & bolts retightening (torque-check points) | Every 2 operating hours | Easy | Retighten chassis/engine torque-check-point nuts and bolts per the Torque-Check Points list. |
| Air filter cleaning, oiling & replacement | Every 2 operating hours | Easy | Clean foam air filter element with solvent and re-oil with foam air-filter oil. Replace element as required. |
| Frame cleaning & inspection | Every 2 operating hours | Easy | Clean frame and inspect for cracks or damage. |
| Fuel tank & fuel cock cleaning & inspection | Every 7 operating hours | Easy | Clean and inspect fuel tank and fuel cock. |
| Brake lever/pedal adjustment, pivot lube & disc/fluid inspection | Every 2 operating hours | Moderate | Adjust brake lever position and pedal height; lubricate lever/pedal pivot points (after washing the motorcycle or riding in rain); check brake disc surface and fluid level/leakage; retighten disc bolts, caliper bolts, master-cylinder bolts and union bolts. |
| Rear shock absorber inspection, adjustment, lubrication & retightening | Every 2 operating hours | Advanced | Check rear shock operation and adjust; lubricate shock linkage/assembly with molybdenum disulfide grease (after washing the motorcycle or riding in rain); retighten mounting hardware. |
| Chain guard & roller inspection | Every 2 operating hours | Easy | Inspect chain guard, chain roller/slider and drive chain support guide for wear or damage. |
| Swingarm inspection, lubrication & retightening | Every 2 operating hours | Moderate | Inspect swingarm pivot bearings for looseness; lubricate with molybdenum disulfide grease; retighten pivot hardware. |
| Relay arm & connecting rod (linkage) inspection, lubrication & retightening | Every 2 operating hours | Moderate | Inspect rear suspension relay arm and connecting rod (linkage) bearings; lubricate with molybdenum disulfide grease; retighten. |
| Steering head bearing inspection, lubrication & replacement | Every 12 operating hours | Advanced | Check steering head free play and retighten; clean and lubricate bearings with lithium-soap-based grease. Replace bearings as required. |
| Tire, wheel & spoke inspection; sprocket bolt retightening | Every 2 operating hours | Moderate | Check tire air pressure, wheel runout, spoke looseness and tire wear; retighten rear sprocket bolts. |
| Throttle & control cable routing check & lubrication | Every 2 operating hours | Easy | Check throttle and control cable routing/connection; lubricate with Yamaha cable lube or SAE 10W-30 motor oil. |
| Transmission oil change | Every 500 km (first at 2 km) · Every 12 operating hours | Easy | Drain and replace transmission/engine oil (Yamalube 4 (10W-30) or SAE 10W-30 SE motor oil). |
| Brake fluid replacement | Every 12 months · Replace every 24 months | Moderate | Replace front and rear hydraulic brake fluid. |
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Easy: basic tools, straightforward Easy–Moderate: varies by task — somewhere between the two Moderate: some mechanical know-how helps Advanced: specialized tools/skill, still DIY-doable Expert: significant experience required Professional: dealer or shop recommended
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