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2021 KTM 390 Adventure Overview
KTM 390 Adventure is an enduro / off-road motorcycle, displacing 373 cc. Power comes from a Four stroke, single cylinder. DOHC with finger followers, 4 valves engine, a compression ratio of 12.6:1. On the performance side, it delivers 43.5 hp @ 9500 rpm of peak power and 3.6 kg-m of torque. On the road, the 2021 390 Adventure tips the scales at 158 kg, carries a 14-litre fuel tank, offers a seat height of 855 mm and spans a 1430 ± 15.5 mm wheelbase. That's roughly 40.8 kg lighter than the average enduro / off-road motorcycle in our database. The full 2021 KTM 390 Adventure spec sheet below covers every technical detail, from suspension travel to tyre sizes.
2021 390 Adventure - Pros & Cons
Strengths
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Strong power output: With 43.5 hp @ 9500 rpm and 3.6 kg-m of torque on tap, the 390 Adventure is no slouch for its class.
Considerations
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Tall seat height: At 855 mm, shorter riders will likely be on tiptoes at a standstill - worth sitting on one before you buy.
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Chain final drive upkeep: Budget time for routine chain maintenance - it's cheap to replace but needs consistent attention to avoid premature sprocket wear.
Wear Points & Servicing Notes
Cooling system servicing
390 Adventure's Liquid Cooled setup is low-maintenance provided the coolant interval is kept - old, acidic coolant is the main cause of long-term corrosion in the water passages.
Brake disc and pad wear
Braking up front comes from Single 320 mm disc, 4 piston, radially mounted caliper - solid stopping power, with disc and pad wear best checked on the same schedule as tyre changes.
Suspension condition on used examples
The 390 Adventure's suspension runs 43 mm WP APEX inverted fork at the front. The rear uses WP APEX shock absorber, adjustbable rebound and spring preload. Fork-seal condition and rear linkage play are the two things worth checking before buying used.
Final drive maintenance
The 390 Adventure uses chain final drive, which is cheap to replace but needs regular cleaning, lubrication and tension checks to get a full service life out of the sprockets.
Frame & chassis check
Built around a Steel trellis frame, powder coated, Subframe Steel trellis frame, powder coated, the 390 Adventure's chassis is straightforward to inspect: look for corrosion, cracks or repair welds around stress points like the head-stock and swingarm mounts.
390 Adventure - Buying & Maintenance Guide
What to check before buying
Before handing over money for a used 2021 KTM 390 Adventure, cover the fundamentals: service book and oil change history, chain and sprocket wear, and any sign of oil weeping around the casings. Cold-starting it yourself tells you a lot - a healthy 390 Adventure should catch quickly and settle into a smooth idle.
Oil and filter changes
Nothing protects a 390 Adventure's engine like disciplined oil changes - stay on the manufacturer's schedule (roughly every 6,000 km or annually). Match the viscosity grade to what the owner's manual specifies, not what's cheapest.
Carburetor upkeep
Deposits in the carbs are the usual culprit behind poor running on a stored 390 Adventure - strip and clean the float bowls before the first start. Pilot jets clog first and get overlooked most, so make a point of checking them.
2021 KTM 390 Adventure - Frequently Asked Questions
What engine does the 2021 KTM 390 Adventure have?
The 2021 KTM 390 Adventure uses a Four stroke, single cylinder. DOHC with finger followers, 4 valves engine with 373 cc of displacement. It is liquid cooled.
How much does the 2021 KTM 390 Adventure weigh?
The 2021 KTM 390 Adventure weighs 158 kg. This is the manufacturer's dry figure.
How much power does the 2021 KTM 390 Adventure make?
The 2021 KTM 390 Adventure produces 43.5 hp @ 9500 rpm of power and 3.6 kg-m of torque. These are peak figures.
What is the fuel tank capacity of the 2021 KTM 390 Adventure?
The 2021 KTM 390 Adventure has a 14-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 233-280 km between stops.
Is the 2021 KTM 390 Adventure suitable for shorter riders?
The 2021 KTM 390 Adventure has a seat height of 855 mm. This is towards the tall end of the spectrum and will require most riders under 175 cm to tiptoe at stops.
What brakes does the 2021 KTM 390 Adventure have?
The 2021 KTM 390 Adventure uses Single 320 mm disc, 4 piston, radially mounted caliper at the front and Single 230 mm disc 2 piston caliper at the rear.
What tyre sizes does the 2021 KTM 390 Adventure use?
The 2021 KTM 390 Adventure runs 100/90 ZR 19 front and 130/80 ZR 17 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2021 KTM 390 Adventure have?
The 2021 KTM 390 Adventure is fitted with a 6 Speed transmission.
KTM 390 Adventure Spec Evolution
The KTM 390 Adventure was produced across 3 model years (2021-2023). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2021 |
2022 |
2023 |
| Max Power |
43.5 hp / 32 kW @ 9500 rpm |
43.5 hp / 32 kW @ 9500 rpm |
44 hp / 32.8 kW @ 9000 rpm |
| Engine Detail |
Four stroke, single cylinder. DOHC with finger followers, 4 valves |
Four stroke, single cylinder, DOHC with finger followers, 4 valves |
Four stroke, single cylinder, DOHC with finger followers, 4 valves |
| Seat Height |
855 mm / 33.6 in |
855 mm / 33.6 in |
830 - 855 mm / 32.6 in - 33.6 in |
| Fuel Capacity |
14 Litres / 3.8 US gal / 2.9 Imp gal |
14.5 Litres / 3.8 US gal |
14.5 Litres / 3.8 US gal |
| ABS |
Bosch 9.1MP Two Channel (disengageable) |
Bosch 9.1MP Two Channel-ABS (incl. Cornering-ABS and offroad mode) |
Bosch 9.1 MP (incl. Cornering-ABS and offroad mode, disengageable) |
| Clutch |
PASC slipper clutch, mechanically operated |
PASC antihopping clutch, mechanically operated |
PASC antihopping clutch, mechanically operated |
| Steering Head Angle |
63,5° |
63.5° |
63.5° |
| Max Torque |
3.6 kg-m / 35.3 Nm @7000rpm |
37 Nm / 27.2 lb-ft@ 7000rpm |
37 Nm / 27.2 lb-ft@ 7000rpm |
Key Specifications
Engine
Four stroke, single cylinder. DOHC with finger followers, 4 valves
Power
43.5 hp / 32 kW @ 9500 rpm
Torque
3.6 kg-m / 35.3 Nm @7000rpm
Top Speed
Not published by manufacturer
Weight
158 kg / 348.3 lbs
Fuel Capacity
14 Litres / 3.8 US gal / 2.9 Imp gal
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Full 2021 KTM 390 Adventure Specifications
Year
2020 - 21
Make Model
KTM 390 Adventure
Seat Height
855 mm / 33.6 in
Wheelbase
1430 ± 15.5 mm / 56.3 in ± 0.6 in
Ground Clearance
200 mm / 7.8 in
Dry Weight
158 kg / 348.3 lbs
Fuel Capacity
14 Litres / 3.8 US gal / 2.9 Imp gal
Displacement
373 cc / 22.7 cu-in
Engine Detail
Four stroke, single cylinder. DOHC with finger followers, 4 valves
Bore x Stroke
89 x 60 mm
Compression Ratio
12.6:1
Cooling System
Liquid Cooled
Exhaust
Stainless steel primary and aluminium secondary silencer
Fuel Induction
Bosch EFI throttle body 38 mm
Ignition
Bosch EMS with RBW
Lubrication
Wet sump
Starter
Electric
Battery Capacity
12V, 8 Ah
Clutch
PASC slipper clutch, mechanically operated
Final Drive
Chain X-Ring 520
Final Drive Ratio
15:45
Primary Drive Ratios
30:80
Transmission / Drive
6 Speed
Frame Type
Steel trellis frame, powder coated, Subframe Steel trellis frame, powder coated
Suspension - Front
43 mm WP APEX inverted fork
Suspension - Rear
WP APEX shock absorber, adjustbable rebound and spring preload
Handlebar
Aluminium, tapered, Ø 26 / 22 mm
Steering Head Angle
63,5°
Trail
98 mm / 3.8 in
Wheel Travel - Front
170 mm / 6.7 in
Wheel Travel - Rear
177 mm / 7.0 in
Brakes - Front
Single 320 mm disc, 4 piston, radially mounted caliper
Brakes - Rear
Single 230 mm disc 2 piston caliper
ABS
Bosch 9.1MP Two Channel (disengageable)
Tyres - Front
100/90 ZR 19
Tyres - Rear
130/80 ZR 17
Wheels - Front
Cast aluminium wheels 2.50 x 19
Wheels - Rear
Cast aluminium wheels 3.50 x 17
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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