Naked roadster (parallel-twin, chain)
KTM 790 Duke (2018–2026)
Maintenance Schedule
13 recurring services keep the 2018–2026 KTM 790 Duke healthy, starting with oil changes every 6,000 miles. Budget roughly $2,500–11,100 in routine maintenance over 50,000 miles at typical U.S. shop prices.
Applies to model years 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Full schedule
Intervals follow manufacturer-typical recommendations for motorcycles of this class. Verify against your owner's manual.
| Service | Interval | Est. cost | Notes |
|---|---|---|---|
| Chain Clean, Lube & Adjust | Every 600 mi or 1 mo | $0–40 | Clean, lube, and check slack on the chain often, cheap DIY that prevents fast wear and a snatchy driveline. |
| Tire Inspection & Age Check | Every 5,000 mi or 12 mo | $0–40 | Check tread, pressure, and the DOT date code. Motorcycle tires harden and should be replaced by about 5-6 years regardless of tread. |
| Oil & Filter Change | Every 6,000 mi or 12 mo | $70–180 | Engine oil and filter: the LC8c twin shears oil fast, so change at least yearly even if under mileage. |
| Brake Pads Inspection | Every 6,000 mi or 12 mo | $0–60 | Check pad thickness front and rear; replacement runs more when pads are worn to the backing. |
| Battery Test | Every 6,000 mi or 12 mo | $0–40 | Load-test the battery and check charging voltage; keep it on a tender during winter storage. |
| Air Filter | Every 12,000 mi or 3 yr | $30–90 | Inspect and replace the airbox filter element; sooner if ridden in dust or dirt. |
| Brake Fluid Flush | Every 12,000 mi or 2 yr | $70–160 | Flush DOT 4 fluid every 2 years; it absorbs water and fades under hard braking heat. |
| Steering & Wheel Bearings Check | Every 12,000 mi or 2 yr | $30–120 | Check steering-head and wheel bearings for notchiness or play; worn bearings cause wobble and uneven tire wear. |
| Spark Plugs | Every 18,000 mi or 4 yr | $40–120 | Replace both iridium plugs; access needs the tank lifted, adding a little labor. |
| Chain & Sprocket Replacement | Every 18,000 mi or 5 yr | $200–500 | Replace chain and both sprockets as a matched set; a worn chain destroys new sprockets and vice versa. |
| Valve Clearance Check | Every 20,000 mi or 4 yr | $250–650 | Measure DOHC shim-under-bucket clearances; labor-heavy since cams come out to swap shims. Rarely needs adjustment but must be checked. |
| Fork Oil Change | Every 20,000 mi or 4 yr | $150–400 | Refresh WP fork oil and seals to restore damping; degraded oil makes the front feel vague and harsh. |
| Coolant Change | Every 24,000 mi or 4 yr | $80–180 | Flush and refill coolant on this liquid-cooled twin every few years to keep corrosion inhibitors fresh. |
Common questions
How often should I change the oil on a 2018–2026 KTM 790 Duke?
Every 6,000 miles or 12 months, whichever comes first. A typical U.S. shop charges $70–180. Engine oil and filter: the LC8c twin shears oil fast, so change at least yearly even if under mileage..
How much does it cost to maintain a KTM 790 Duke (2018–2026)?
Routine maintenance on the 2018–2026 KTM 790 Duke runs roughly $2,500–11,100 over 50,000 miles at typical U.S. shop prices, spread across 13 recurring services. Doing the simple jobs yourself pulls the real number toward the low end.
What is the most expensive scheduled service on this 790 Duke?
Valve Clearance Check at $250–650, due every 20,000 miles. Measure DOHC shim-under-bucket clearances; labor-heavy since cams come out to swap shims. Rarely needs adjustment but must be checked..
This schedule is a general, rule-based estimate for motorcycles of this class, not official manufacturer data. Hard riding, track use, and long storage shift many intervals. Information here is general reference only and may be estimated or AI-assisted. It is not professional advice. Verify with a qualified professional before acting, and use it at your own risk. See our Terms & Disclaimer.