Honda Rebel 300/CMX300 2021 Maintenance Schedule
The 2021 Honda Rebel 300/CMX300 maintenance schedule below covers the manufacturer's recommended service intervals for general maintenance, air filter, spark plugs, valve clearance, oil, coolant, drive chain maintenance, brake fluid and tires. 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 2018–2026): hondamotopub.com
Full schedule
| Task | Interval | Difficulty | Notes |
|---|---|---|---|
| Fuel Line | Every 8,000 mi | Moderate | Inspect fuel line and connections for leaks, cracks, or deterioration. |
| Throttle Operation | Every 8,000 mi | Moderate | Inspect throttle grip free play and operation for smooth, proper return. |
| Air Cleaner | Every 12,000 mi | Easy | Replace air cleaner element. |
| Crankcase Breather | Every 4,000 mi (first at 8,000 mi) | Easy | Clean crankcase breather tube. |
| Spark Plug | Every 16,000 mi · Replace every 32,000 mi | Easy–Moderate | Inspect spark plug every 16,000 mi; replace every 32,000 mi. |
| Valve Clearance | Every 16,000 mi | Advanced | Inspect and adjust valve clearance. |
| 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) | Easy | Replace engine oil filter. |
| Engine Idle Speed | Every 8,000 mi | Moderate | Inspect and adjust engine idle speed. |
| Radiator Coolant | Every 8,000 mi · Replace every 36 months | Easy–Moderate | Inspect radiator coolant level and condition; replace coolant every 3 years. |
| Cooling System | Every 8,000 mi | Easy–Moderate | Inspect cooling system hoses, radiator, and connections for leaks or damage. |
| Secondary Air Supply System | Every 16,000 mi | Moderate | Inspect secondary air supply system. |
| Evaporative Emission Control System | Every 16,000 mi | Moderate | Inspect evaporative emission control system. |
| Drive Chain | Every 600 mi | Easy | Inspect drive chain slack and condition, and lubricate. |
| Brake Fluid | Every 4,000 mi (first at 8,000 mi) · Replace every 24 months | Moderate | Inspect brake fluid level and condition; replace brake fluid every 2 years. |
| Brake Pads Wear | Every 4,000 mi | Moderate | Inspect brake pad wear. |
| 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. |
| Headlight Aim | Every 8,000 mi | Easy | Inspect and adjust headlight aim. |
| Clutch System | Every 4,000 mi | Easy–Moderate | Inspect clutch lever free play and clutch system operation. |
| Side Stand | Every 8,000 mi | Easy | Inspect side stand operation and spring. |
| Suspension | Every 8,000 mi | Moderate | Inspect front and rear suspension operation. |
| Nuts, Bolts, Fasteners | Every 8,000 mi | Easy–Moderate | Inspect and tighten major nuts, bolts, and fasteners. |
| Wheels/Tires | Every 8,000 mi | Moderate | Inspect wheels and tires for wear, damage, and proper air pressure. |
| Steering Head Bearings | Every 8,000 mi | Advanced | Inspect steering head bearings for looseness or damage. |
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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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