Honda CB300R 2021 Maintenance Schedule
The 2021 Honda CB300R maintenance schedule below covers the manufacturer's recommended service intervals for oil, general maintenance, valve clearance, air filter, spark plugs, coolant, brake fluid, tires and drive chain maintenance. Intervals are shown in kilometres by default and can be switched to miles.
Sourced from American Honda Motor Co. (Owners Manual) (this document covers model years 2020–2026): hondamotopub.com
Full schedule
| Task | Interval | Difficulty | Notes |
|---|---|---|---|
| Engine Oil | Every 8,000 mi (first at 600 mi) · Every 12 months | Easy | Replace engine oil. |
| Engine Oil Filter | Every 16,000 mi (first at 600 mi) · Every 12 months | Easy | Replace engine oil filter. |
| Crankcase Breather | Every 4,000 mi | Easy | Clean the crankcase breather tube/element. |
| Valve Clearance | Every 16,000 mi | Advanced | Inspect and adjust valve clearance. |
| Air Cleaner | Every 25,600 mi · Replace every 12,000 mi | Easy | Replace air cleaner (air filter) element. |
| Evaporative Emission Control System | Every 16,000 mi | Moderate | Inspect evaporative emission control system. |
| Brake Pads Wear | Every 4,000 mi | Easy–Moderate | Inspect brake pads for wear. |
| Side Stand | Every 8,000 mi | Easy | Inspect side stand spring and operation. |
| Suspension | Every 8,000 mi | Moderate | Inspect front and rear suspension. |
| Nuts, Bolts, Fasteners | Every 8,000 mi | Easy–Moderate | Inspect and tighten nuts, bolts, and fasteners. |
| Spark Plug | Every 16,000 mi · Replace every 32,000 mi | Easy–Moderate | Inspect spark plug every 16,000 mi (25,600 km); replace spark plug every 32,000 mi (51,200 km). |
| Radiator Coolant | Every 8,000 mi · Every 36 months · Replace every 36 months | Easy–Moderate | Inspect coolant level and condition; replace radiator coolant. |
| Brake Fluid | Every 4,000 mi · Replace every 24 months | Moderate | Inspect brake fluid level and condition. |
| Secondary Air Supply System | Every 16,000 mi | Moderate | Inspect secondary air supply system. |
| Steering Head Bearings | Every 8,000 mi | Advanced | Inspect steering head bearings for looseness or damage. |
| Fuel Line | Every 8,000 mi | Moderate | Inspect fuel line and connections for leaks, cracks, or deterioration. |
| Headlight Aim | Every 8,000 mi | Easy–Moderate | Inspect and adjust headlight aim. |
| Clutch System | Every 4,000 mi | Easy–Moderate | Inspect clutch lever freeplay and clutch system operation. |
| Wheels/Tires | Every 8,000 mi | Moderate | Inspect wheels and tires for damage, tread wear, and correct air pressure. |
| Cooling System | Every 8,000 mi | Easy–Moderate | Inspect cooling system (hoses, radiator, connections) for leaks and damage. |
| Brake System | Every 8,000 mi | Moderate | Inspect overall brake system operation. |
| Brake Light Switch | Every 8,000 mi | Easy | Inspect brake light switch operation. |
| Throttle Operation | Every 8,000 mi | Easy–Moderate | Check throttle grip freeplay and confirm smooth operation without binding or sticking. |
| Engine Idle Speed | Every 8,000 mi | Easy–Moderate | Inspect and adjust engine idle speed. |
| Drive Chain | Every 600 mi (first at 1,000 mi) | Easy | Inspect drive chain slack and condition; lubricate drive chain. |
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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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