KTM 390 Adventure R 2025-2026 Service Manual

KTM's own confirmed product page doesn't hedge on the ambition behind this launch: "we have to say it - the KTM 390 Adventure R is the most off-road capable middleweight adventure bike in its segment. Yes, it's a bold claim, but with a 399cc powerplant, true rally-inspired design, 230mm adjustable suspension, and a 21/18-inch wheel split, this new addition to the KTM R stable simply rewrites the rulebook." Rider Magazine's own confirmed testing provides genuine, honest context on what came before: "when the KTM 390 Adventure was introduced in 2020, it was a compact, accessible, and affordable entry in the burgeoning ADV market... equipped with cast-aluminum wheels in 19-inch front/17-inch rear sizes and middling ground clearance and suspension travel, its off-road capabilities were somewhat limited."

Power comes from the latest-generation LC4c (compact) engine, a 399cc liquid-cooled single, delivering a claimed 45 hp and 28.8 lb-ft of torque — Rider Magazine's own confirmed account notes this exact engine is shared across a genuinely broad KTM family built in India with Bajaj: "the 390 Duke naked bike, the RC 390 sportbike, and the new 390 SMC R supermoto." KTM's own confirmed feature copy notes real internal refinement over the outgoing engine: "an improved gearbox and an optimized cylinder head," delivering "more power, smoother acceleration, and lighter overall weight than before," while meeting Euro 5.2 emissions standards.

Cycle News' own confirmed spec sheet details genuine premium suspension hardware on the R specifically: "43mm open cartridge forks with nine inches of travel (compression and rebound adjustability in 30-click steps)... a WP Apex Separate Piston shock absorber with 20 levels of rebound adjustment and nine inches of travel" — a real step up from the more road-focused X sibling's non-adjustable front end and shorter 7.8-inch travel. ADV Pulse's own confirmed weight figure lists 165kg (364 lbs) without fuel — "13 pounds heavier than the outgoing 390 Adventure model," a genuine trade-off for the added off-road capability.

Fasterwheeler's own confirmed feature account lists Cornering Motorcycle Traction Control (MTC), Cornering ABS, and Offroad ABS as standard electronics, riding on 21-inch front and 18-inch rear heavy-duty spoked wheels with Mitas Enduro Trail E07+ tires, and a 14-litre (3.69-gallon) fuel tank. Rider Magazine's own confirmed 2025 US pricing lists $6,999 base MSRP plus $575 freight and a $700 import duty surcharge. This exact 399cc LC4c-powered R configuration carries forward from its 2025 launch into the 2026 model year with no significant changes reported.

This factory service manual covers the procedures, torque specs, and diagrams needed to keep a 2025-2026 390 Adventure R running the way it was built to.