Oil and filter change
≈ 7,500 km or 1 year
JASO MA or MA2 approved four-stroke motorcycle oil (JASO MB on scooters): an “energy conserving” car oil makes the wet clutch slip. Change it more often in city use or on track.
Source [1]390 Duke (2017) · 2017–2023
KTM 390 Duke (2017) 373 · 44 hp (2017 to 2023)
The KTM 390 Duke (2017) 373 uses the KTM LC4c 373 petrol engine with 44 hp.
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Technical specifications
- Fuel
- Petrol
- Power
- 44 PS / 32 kW
- Displacement
- 373 cm³
- Cylinders
- 1
- Engine code
- KTM LC4c 373
- Period covered
- 2017–2023
- Documented market
- Europe
Transmission
- Manual · 6 speeds
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [1] AutoKarnet
This version
44 hp (32 kW), chain final drive, 6-speed manual. Built from 2017 to 2023.
AutoKarnet advice
In the range
It is the only petrol version of this generation. The KTM LC4c 373 engine is also fitted to: KTM 390 Duke (390 Duke (2013)).
AutoKarnet advice
Body style and inspection points
On a motorcycle, tyres, final drive and brakes matter as much as the oil change. Check the tyre manufacturing date, steering-head play and fork-tube seals; an oil film on a tube means a fork seal needs replacing. A notched steering bearing can be felt when braking at low speed.
AutoKarnet advice
Comparing generations
Other documented generations of this model: • 390 Duke (2013) (2013–2016) : naked bike, 44–44 hp. • 390 Duke (2024) (from 2024) : naked bike, 45–45 hp. A first registration near a generation change does not identify the car on its own: check the body style and powertrain before using a service schedule.
AutoKarnet advice
Maintenance and records
≈: estimated reference — the vehicle’s service indicator prevails.
Brake fluid
Every 2 years
Replace the fluid in both circuits (and the hydraulic clutch if fitted), whatever the mileage; dark fluid has absorbed moisture.
Source [1]Fork oil
≈ 30,000 km
Fork oil change and seal check; an oil film on the tubes means a seal needs replacing before it contaminates the brake caliper.
Source [1]Chain kit (chain and sprockets)
≈ 25,000 km
Lubricate and check the tension every 500 to 1,000 km and after rain; replace chain and sprockets together when the chain no longer holds its tension or the teeth are hooked.
Source [1]Spark plugs
Every 15,000 km
Replace the full set; worn plugs raise consumption and cause misfires.
Source [1]Air filter
Every 15,000 km
Replace more often in dusty conditions.
Source [1]Valve clearance
Every 15,000 km
Check and adjust if needed, often together with the plugs; too little clearance burns the valves, too much makes the engine noisy.
Source [1]Coolant
Every 3 years
Replace the coolant and check the hoses and radiator; check the level cold between services.
Source [1]Questions about this version (3)
Which engine is in the KTM 390 Duke (2017) 373?
The KTM LC4c 373 petrol engine (373 cc), 44 hp (32 kW).
AutoKarnet advice
Which oil for the KTM 390 Duke 373?
A JASO MA2 10W-40 four-stroke motorcycle oil suited to the KTM LC4c 373 engine.
AutoKarnet advice
How do I check this page matches my car?
This page covers KTM 390 Duke (2017) 373 44 hp, naked bike, 2017–2023, with 44 hp (32 kW), KTM LC4c 373, 373 cm³, 6-speed manual, 2017–2023. Compare these details with the registration document and gearbox identification. The designation KTM LC4c 373 may cover several revisions: a VIN is still needed to confirm part numbers.
AutoKarnet advice
Documentary sources
- [1] Rédaction AutoKarnet
AutoKarnet · FR · Europe · Synthèse éditoriale AutoKarnet · Accessed 09/10/2026