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The biggest documented update to the KTM 390 Duke arrived with the 2024 model, which KTM described as a complete redesign. It brought a new 398.7 cc engine, a revised chassis, adjustable suspension and updated rider technology. KTM’s 2025 Australia material says the gearbox and optimized cylinder head introduced in 2024 carried over; KTM Japan’s announcement highlighted a black seat color change. That is a substantial update followed by a largely carryover model year—not evidence that the 2025 bike received a new mechanical overhaul or is objectively better than every earlier Duke.
What changed with the 2024 KTM 390 Duke?
KTM North America described the 2024 lineup as a complete redesign, citing new engines, an all-new chassis concept and new styling. The main documented changes combine mechanical revisions with adjustable hardware and updated electronics.
New 398.7 cc engine
The redesign introduced a liquid-cooled, single-cylinder LC4c engine. KTM’s 2025 Australia specifications list displacement as 398.7 cm³, output as 45 PS and maximum torque as 39 Nm. These are manufacturer-published figures, not independent test results. The engine’s displacement and output are useful points of comparison with an older Duke, but they do not by themselves establish how the bike performs in real-world riding.
Revised frame and swingarm
KTM describes a two-piece frame arrangement: a steel trellis main frame paired with a die-cast aluminum subframe, plus a curved, lightweight swingarm. These are structural changes to the bike’s chassis concept. KTM’s product descriptions do not, on their own, establish a particular improvement in handling, comfort or durability.
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Adjustable suspension
KTM specifies a 43 mm WP APEX open-cartridge front fork with adjustment and a rear shock adjustable for rebound and preload. Adjustment gives a rider or technician ways to tailor the suspension setup; it does not guarantee a better result for every rider or road. Australia’s 2025 specification page lists 150 mm of travel at both ends.
Rider aids and display
KTM’s 2024 Ireland product page describes STREET and RAIN ride modes, a 5-inch TFT display with a TRACK screen, and launch control. KTM says the TRACK screen enlarges the rev counter and displays a lap timer, selected gear and preferred rider-aid settings. Its launch-control description says the system holds the engine at 7,000 rpm with wide-open throttle while the rider waits to release the clutch. Those details are KTM’s descriptions, not independently measured performance findings.
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KTM’s North American launch release also describes selectable Supermoto ABS, smartphone connectivity and an optional Quickshifter+. Equipment can depend on market, model specification and whether an item is optional, so check the local bike’s equipment list rather than assuming every feature is standard on every 390 Duke.
What is different on the 2025 model?
The available official material supports a restrained answer: the core mechanical updates introduced for 2024 continued into 2025. KTM Australia says the updated gearbox and optimized cylinder head are the same updates released in 2024. KTM Japan’s MY2025 announcement identifies a black seat color as its model change. The documented information does not support describing 2025 as a new engine or chassis generation.
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KTM Japan announced a planned September 2025 launch and a ¥829,000 MSRP for that market. These are historical Japan-market details, not current pricing or a guide to availability elsewhere. The Japan announcement also says its principal specifications are EU values that may differ from Japanese-market specifications.
2024 versus 2025: what matters to a buyer?
| Decision point | 2024 model | 2025 model |
|---|---|---|
| Engine and chassis | KTM introduced the 398.7 cc LC4c engine and revised chassis concept as part of its redesign. | KTM Australia says the gearbox and optimized cylinder head updates from 2024 carry over; the cited material does not establish a new engine or chassis redesign for 2025. |
| Electronics and equipment | KTM’s 2024 Ireland page describes STREET and RAIN modes, a 5-inch TFT with TRACK screen and launch control. Other equipment and options vary by market. | Confirm the equipment on the exact local model. The cited 2025 announcements do not establish a universal equipment list. |
| Appearance | KTM described new styling as part of the 2024 redesign. | KTM Japan highlighted a black seat color change for its MY2025 model. |
| Price and availability | Not stated in the cited material as a comparable current price. | KTM Japan announced ¥829,000 and a planned September 2025 launch for Japan; these are historical, market-specific details. |
| Warranty and support | Not stated in the cited material as a comparable figure. | KTM Japan’s announcement lists a two-year warranty for that announced model; do not assume that term applies in other markets. |
For a specific purchase, compare the local standard and optional equipment, the seller’s price and availability, warranty terms, dealer support and maintenance requirements. Styling preference—including the Japan-announced seat color—may matter, but it is separate from a mechanical upgrade.
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2025 specifications published for Australia
KTM Australia’s 2025 technical page lists the following figures. They describe that market’s published specification; specifications, equipment and homologation can differ elsewhere.
| Specification | KTM Australia, 2025 |
|---|---|
| Engine | 398.7 cm³, liquid-cooled, single-cylinder, four-stroke |
| Power | 45 PS |
| Torque | 39 Nm |
| Gearbox | Six-speed |
| CO₂ emissions | 79 g/km |
| Front and rear disc diameters | 320 mm front; 240 mm rear |
| Front brake caliper | Four-piston radial fixed caliper |
| Chain | 520 X-Ring |
| Wheelbase | 1,357 mm |
| Suspension travel | 150 mm front; 150 mm rear |
| Fully fueled weight | 165 kg |
| Seat height | 820/800 mm |
KTM Japan separately lists 33 kW (45 PS) at 8,500 rpm, 39 Nm at 7,000 rpm, 110/70 R-17 front and 150/60 R-17 rear tires, a 1,357 mm wheelbase, an 820 mm seat height, approximately 15 L of fuel capacity and 165 kg fueled. The Japan announcement explicitly warns that these are EU specifications and that Japanese-market values may differ. It also lists India as the country of manufacture for the announced model.
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The Australia and Japan pages are regional references, not interchangeable specification sheets. For operation, maintenance or fitment, use the owner’s manual for the exact variant and market. KTM’s 2025 manual is dated 27 August 2025 and warns that its information was current at publication, that minor design differences may exist, and that specifications are non-binding and may change or be adapted to local conditions.
Maintenance and accessories: verify the exact fit
KTM Australia’s specification page names Motorex Formula 4T 15W/50 as engine oil. Treat that as a reference for the listed Australian model, not a universal instruction for every 390 Duke. Before buying oil, parts or accessories, check the owner’s manual and confirm the required grade, specification and fitment for the motorcycle’s exact year and market. KTM Australia’s 2025 model page also provides a PowerParts section, but a catalog listing alone does not establish fitment for every variant.
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