Yamaha MT-03 321 2025 Maintenance Schedule
The 2025 Yamaha MT-03 321 maintenance schedule below covers the manufacturer's recommended service intervals for general maintenance, spark plugs, air filter, tires, drive chain maintenance, oil, coolant, valve clearance and brake fluid. Intervals are shown in kilometres by default and can be switched to miles.
321ccEngine size
41Maintenance items
Official manufacturer manual
Sourced from Yamaha MTN320-AP Owner's Manual BEV-F8199-21 (Australia-market): yamahacity.com.au
Full schedule
| Task | Interval | Difficulty | Notes |
|---|---|---|---|
| Fuel line inspection | Every 10,000 km · Every 12 months | Easy | Check fuel hoses for cracks or damage; replace if necessary. |
| Spark plug check/adjust gap/clean | Every 10,000 km · Replace every 20,000 km | Moderate | Check condition; adjust gap and clean. |
| Fuel injection idle speed check | Every 1,000 km (first at 1,000 km) · Every 12 months | Moderate | Check engine idle speed. |
| Fuel injection synchronization adjustment | Every 10,000 km · Every 12 months | Moderate | Check and adjust synchronization. |
| Exhaust system check | Every 10,000 km (first at 1,000 km) | Easy | Check for leakage; tighten if necessary; replace gaskets if necessary. |
| Evaporative emission control system check | Every 20,000 km | Easy | Check control system for damage; replace if necessary. |
| Air induction system check | Every 10,000 km · Every 12 months | Easy | Check the air cut-off valve, reed valve, and hose for damage; replace any damaged parts. |
| Diagnostic system check | Every 10,000 km (first at 1,000 km) · Every 12 months | Moderate | Perform dynamic inspection using Yamaha diagnostic tool; check error codes. |
| Air filter element replacement | Every 20,000 km | Easy | Replace air filter element. |
| Air filter case check hose cleaning | Every 10,000 km (first at 1,000 km) | Easy | Clean the air filter case check hose. |
| Clutch operation check | Every 10,000 km (first at 1,000 km) | Easy–Moderate | Check operation; adjust. |
| Front brake inspection | Every 10,000 km (first at 1,000 km) · Every 12 months | Moderate | Check operation, fluid level, and for fluid leakage; replace brake pads if necessary. |
| Rear brake inspection | Every 10,000 km (first at 1,000 km) · Every 12 months | Moderate | Check operation, fluid level, and for fluid leakage; replace brake pads if necessary. |
| Brake hose inspection | Every 10,000 km · Every 12 months | Moderate | Check for cracks or damage. |
| Brake hose replacement | Every 48 months · Replace every 48 months | Moderate | Replace brake hose. |
| Wheel inspection | Every 10,000 km | Moderate | Check runout and for damage; replace if necessary. |
| Tire inspection | Every 10,000 km · Every 12 months | Moderate | Check tread depth and for damage, replace if necessary; check and correct air pressure. |
| Wheel bearing inspection | Every 10,000 km | Moderate | Check bearings for looseness or damage. |
| Swingarm pivot bearing check | Every 10,000 km | Moderate | Check operation and for excessive play. |
| Drive chain maintenance | Every 800 km | Easy | Check chain slack, alignment and condition; adjust and lubricate with a special O-ring chain lubricant. |
| Steering bearing check | See notes | Moderate | Check bearing assemblies for looseness. |
| Steering bearing repack | Every 20,000 km | Moderate | Moderately repack with lithium-soap-based grease. |
| Chassis fastener check | Every 10,000 km · Every 12 months | Easy | Make sure that all nuts, bolts and screws are properly tightened. |
| Brake lever pivot shaft lubrication | Every 10,000 km · Every 12 months | Easy | Lubricate with silicone grease. |
| Brake pedal pivot shaft lubrication | Every 10,000 km · Every 12 months | Easy | Lubricate with lithium-soap-based grease. |
| Clutch lever pivot shaft lubrication | Every 10,000 km · Every 12 months | Easy | Lubricate with lithium-soap-based grease. |
| Shift pedal pivot shaft lubrication | Every 10,000 km · Every 12 months | Easy | Lubricate with lithium-soap-based grease. |
| Sidestand check and lubrication | Every 10,000 km · Every 12 months | Easy | Check operation; lubricate with lithium-soap-based grease. |
| Sidestand switch check | Every 10,000 km (first at 1,000 km) · Every 12 months | Easy | Check operation; replace if necessary. |
| Front fork inspection | Every 10,000 km | Moderate | Check operation and for oil leakage. |
| Shock absorber inspection | Every 10,000 km | Moderate | Check operation and shock absorber for oil leakage. |
| Engine oil filter cartridge replacement | Every 20,000 km (first at 1,000 km) | Easy | Replace engine oil filter cartridge. |
| Cooling system inspection | Every 10,000 km · Every 12 months | Easy–Moderate | Check coolant level and vehicle for coolant leakage. |
| Coolant replacement | Every 10,000 km · Every 36 months · Replace every 36 months | Moderate | Change coolant. |
| Front and rear brake switch check | Every 10,000 km (first at 1,000 km) · Every 12 months | Easy | Check operation. |
| Moving parts and cables lubrication | Every 10,000 km · Every 12 months | Easy | Lubricate. |
| Throttle grip check, adjust and lubricate | Every 10,000 km · Every 12 months | Easy | Check throttle grip free play, adjust if necessary; lubricate cable and grip housing. |
| Lights, signals and switches check | Every 10,000 km (first at 1,000 km) · Every 12 months | Easy | Check operation; adjust headlight beam. |
| Engine oil & filter change | Every 5,000 km (first at 1,000 km) | Easy | Change engine oil (change at the initial interval and when the oil change indicator flashes or comes on). |
| Valve clearance inspection | Every 40,000 km | Advanced | Check and adjust valve clearance. |
| Brake fluid replacement | Every 10,000 km · Every 24 months · Replace every 24 months | Moderate | Change 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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