Royal Enfield Thunderbird 350X 2018 Maintenance Schedule
The 2018 Royal Enfield Thunderbird 350X maintenance schedule below covers the manufacturer's recommended service intervals for oil, spark plugs, general maintenance, air filter, valve clearance, battery, drive chain maintenance, tires and brake fluid. Intervals are shown in kilometres by default and can be switched to miles.
346ccEngine size
31Maintenance items
Official manufacturer manual
Sourced from Royal Enfield Official Owner Manuals (also mirrored on ManualsLib as "THUNDERBIRD 350" / manual ID 1809776) (this document covers model years 2018–2020): royalenfield.com
Full schedule
| Task | Interval | Difficulty | Notes |
|---|---|---|---|
| Engine Oil | Every 6,000 km (first at 500 km) · Every 6 months | Easy | Drain and replace engine oil. |
| Engine oil filter paper element | Every 6,000 km (first at 500 km) · Every 6 months | Easy | Replace engine oil filter paper element. |
| Engine sump filter, Magnetic drain plug under gear box and secondary drain plug under crankshaft in crankcase right | Every 6,000 km (first at 500 km) · Every 6 months | Easy–Moderate | Clean engine sump filter (oil strainer) and magnetic drain plugs. |
| Spark plugs (2 nos.) | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 15,000 km · Replace every 15 months | Easy | Clean and adjust spark plugs; replace at specified interval. |
| Carburetor -- clean, inspect and tune | See notes | Advanced | Clean, inspect, and tune carburetor. |
| HT leads for crack | Every 3,000 km (first at 500 km) · Every 3 months | Easy | Inspect HT leads for cracking. |
| Clutch lever / cable free play | Every 1,000 km | Easy | Adjust clutch lever and cable free play. |
| Accelerator, TPS and carburetor cable play Adjustment | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 21,000 km · Replace every 21 months | Easy | Adjust accelerator, TPS, and carburetor cable free play. |
| Rubber hose, Air filter to Carburetor | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 12,000 km · Replace every 12 months | Easy | Inspect air-filter-to-carburetor rubber hose; replace at specified interval. |
| Rubber hose, Inlet manifold | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 12,000 km · Replace every 12 months | Easy | Inspect inlet manifold rubber hose; replace at specified interval. |
| Air filter paper element | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 12,000 km · Replace every 12 months | Easy | Clean air filter paper element; replace at specified interval. |
| Inlet / Exhaust valve seating (compression test) | Every 15,000 km · Every 15 months | Moderate | Inspect inlet/exhaust valve seating via compression test. |
| Cylinder head (Combustion chamber) de-carbonise | Every 27,000 km · Every 27 months | Advanced | De-carbonise cylinder head combustion chamber. |
| Battery terminals (apply petroleum jelly) | Every 3,000 km (first at 500 km) · Every 3 months | Easy | Clean battery terminals and apply petroleum jelly. |
| Earth wire eyelet contact | Every 12,000 km · Every 12 months | Easy | Inspect earth wire eyelet contact. |
| Fuel Filter in Fuel Tap | Every 6,000 km (first at 500 km) · Every 6 months | Easy | Clean fuel filter in fuel tap. |
| Rear Wheel Drive Chain | Every 1,000 km · Replace every 3 km | Easy | Lubricate and adjust drive chain; clean, lubricate & adjust more thoroughly periodically. |
| Rear brake pedal free play adjustment | Every 3,000 km (first at 500 km) · Every 3 months | Easy | Inspect and adjust rear brake pedal free play. |
| Rear wheel cush drive rubbers | Every 12,000 km · Every 12 months · Replace every 24,000 km · Replace every 24 months | Moderate | Inspect rear wheel cush drive rubbers; replace if necessary. |
| Front Fork oil | Every 9,000 km · Every 9 months | Moderate | Inspect front fork oil; replace at specified interval. |
| Steering ball races play | Every 3,000 km · Every 3 months · Replace every 24,000 km · Replace every 24 months | Moderate | Inspect, adjust, and lubricate steering ball races play; replace at specified interval. |
| Spokes tightness / Wheel rim run out front & rear | Every 3,000 km (first at 500 km) · Every 3 months | Easy | Inspect wheel spoke tightness and rim run-out, front and rear. |
| Swing Arm pivot bush & spacer | Every 6,000 km · Every 6 months · Replace every 24,000 km · Replace every 24 months | Moderate | Lubricate swing arm pivot bush and spacer; replace at specified interval. |
| Tyre wear pattern (Front & Rear) | Every 3,000 km (first at 500 km) · Every 3 months | Easy | Inspect front and rear tyre tread wear pattern. |
| Hand levers & kick starter lever pivot | Every 1,000 km | Easy | Lubricate hand lever and kick starter lever pivots. |
| Handle bar Damper Rubbers | Every 21,000 km · Every 21 months | Easy–Moderate | Clean and replace handlebar damper rubbers. |
| Front & Rear brake hose & Banjo Bolt | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 30,000 km · Replace every 30 months | Easy–Moderate | Inspect front and rear brake hose routing and banjo bolt torque; replace at specified interval. |
| Brake Fluid level check / Replacement Front & Rear disc | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 15,000 km · Replace every 15 months | Moderate | Inspect front and rear disc brake fluid level; replace fluid at specified interval. |
| Fuel Pipe | Every 9,000 km · Every 9 months | Moderate | Inspect fuel pipe; replace at specified interval. |
| Pivot -- Side stand, Center stand, Pillion foot rest | Every 3,000 km (first at 500 km) · Every 3 months | Easy | Lubricate side stand, center stand, and pillion foot rest pivots. |
| Evaporative Emission Equipment rubber hoses | Every 3,000 km (first at 500 km) · Every 3 months · Replace every 12,000 km · Replace every 12 months | Easy | Inspect Evaporative Emission Control (EVAP) system rubber hoses; replace at specified interval. |
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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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