KTM 390 Duke mods & upgrades
The 390 Duke is the highest smiles-per-dollar machine in the catalog — light, flickable, cheap to run.
- Engine373 cc single (2013–23) / 399 cc single (2024+)
- Power~44 hp claimed (373) / ~45 hp claimed (399)
- Torque~27 lb-ft (claimed, 373)
- Wet weight~359–364 lb (claimed, by generation)
- Seat height32.7 in (gen 2) / 32.4 in (gen 3)
Parts that fit the 390 Duke
57 parts in 14 categories, with typical prices — verify fitment for your exact year and market.
| Part | Tier | Typical price | Fitment | Add to sheet |
|---|---|---|---|---|
| Exhaust2 fitAkrapovič slip-on (KTM PowerParts catalog) is the aspirational pick; Remus and LeoVince cover the mid tier. On 2017–23 bikes the 'slip-on' replaces only the end can — the cat and main silencer sit under the engine, so treat exhausts as sound-and-weight mods unless you're doing header-back work. | ||||
| Mivv GP Pro slip-on | mid | $500 | fits: verified · 2017+Not 2013–16 | Add to sheet |
| LeoVince LV-10 slip-on | budget | $320 | fits: verified · 2021–23Not 2013–20 or 2024+ | Add to sheet |
| Tune5 fitFlash options for the 390 are thinner than for Japanese brands; the community standard is the PowerTRONIC piggyback or dealer tools. Fueling work matters with intake/header changes, less so with a slip-on. | ||||
| Sprint Filter P08 air filter | premium | $120 | fits: verified390 Duke 2013–16 (PM145S), 2017–23 (PM200S), 2024+ (PM293S) | Add to sheet |
| Dynojet Power Commander 6 | mid | $480 | fits: verified · 2015–20Not 2013–14, 2021+ | Add to sheet |
| DNA performance air filter | mid | $110 | fits: verified390 Duke 2013–16 (R-KT1SM11-01), 2017–23 (P-KT3N18-01), 2024–25 (P-KT3N24-01) | Add to sheet |
| BMC race air filter | mid | $95 | fits: verified390 Duke 2013–16 (FM733/20RACE), 2017–23 (FM995/04RACE), 2024+ (FM01211RACE) | Add to sheet |
| K&N high-flow air filter | budget | $95 | fits: reported · 2013–21KT-1211, KT-1217; 2022+ not listed | Add to sheet |
| Suspension4 fitGen 2's non-adjustable WP APEX fork is the bike's known ceiling. Springs for rider weight, then Andreani-class cartridge kits and a YSS or WP APEX PRO shock — the lightweight-racing crowd has validated all of it. | ||||
| Nitron R1 rear shock | mid | $810 | fits: verified · 2013–23Not the 2024+ 399 cc | Add to sheet |
| Andreani Misano fork cartridge kit | mid | $770 | fits: verified · 2013–15 & 2017+WP 43 fork; 2016 not listed | Add to sheet |
| YSS rear shock | budget | $500 | fits: verified · 2013–172018+ not listed | Add to sheet |
| HyperPro progressive fork springs | budget | $200 | fits: verified · 2017–242013–16 rear spring only | Add to sheet |
| Brakes3 fitByBre (Brembo's Indian subsidiary) radial caliper and 320 mm disc from 2017 on. Sintered pads plus a braided line is the whole upgrade for track-day pace; the hardware itself is up to the job. | ||||
| Galfer Wave front rotor pair | premium | $620 | fits: verified · 2013+Single rotor | Add to sheet |
| EBC Double-H sintered pads (per caliper) | budget | $50 | fits: verified · 2013–25FA606HH | Add to sheet |
| Motul RBF 600 racing brake fluid | budget | $25 eBay — $24.99 checked Oct 14 (opens in new tab) | fits: verifiedNon-silicone synthetic racing brake fluid for hydraulic brake and clutch systems; exceeds DOT 3 and 5.1. | Add to sheet |
| Tires & Wheels6 fitOEM-spec rubber is the first thing to go. Sport tires in 110/70-17 and 150/60-17 are cheap by big-bike standards — the 390's sizes make premium rubber an affordable habit. | ||||
| Pirelli Diablo Supercorsa SP V4 set | premium | $560 | fits: verified · 2013+110/70 front, 150/60 rear | Add to sheet |
| Bridgestone Battlax S23 set | mid | $460 | fits: reported · 2013+110/70 front, 150/60 rear | Add to sheet |
| Michelin Power 6 set | mid | $460 | fits: verified · 2013+110/70 front, 150/60 rear | Add to sheet |
| Pirelli Diablo Rosso IV set | mid | $440 | fits: verified · 2013+110/70 front, 150/60 rear | Add to sheet |
| Metzeler Sportec M9 RR set | mid | $400 | fits: reported · 2013+110/70 front, 150/60 rear | Add to sheet |
| Dunlop Sportmax Q5 set | budget | $510 | fits: verified · 2013+110/70 front, 150/60 rear | Add to sheet |
| Levers5 fitShorty adjustable levers are near-universal small-Duke fitment within a generation and cost little; lever guards apply if you take it to track days. | ||||
| ASV C5 folding lever pair | premium | $300 | fits: verified · 2013–26 | Add to sheet |
| Puig 3.0 lever pair | premium | $240 | fits: verified · 2013–26 | Add to sheet |
| Bonamici EVO brake lever guard | premium | $230 eBay — $258.30 checked Oct 14 (opens in new tab) | fits: reportedSold without adapter; needs a Bonamici adapter chosen by bar-end inner diameter (13–21 mm) or by bike | Add to sheet |
| CRG RC2 lever pair | premium | $220 | fits: reported · 2013–21Clutch lever to 2026 | Add to sheet |
| Pazzo shorty lever pair | mid | $200 | fits: verified · 2013–21Not 2022+ | Add to sheet |
| Rearsets1 fit | ||||
| Sato Racing rearsets | premium | $600 | fits: verified · 2017–23 & 2024+Not 2013–16 | Add to sheet |
| Clip-ons & Throttle2 fit | ||||
| Domino A450 race grips | budget | $30 eBay — $29.95 checked Oct 14 (opens in new tab) | fits: verifiedUniversal 22 mm (7/8 in) open-end race grips, 120–125 mm, for twist throttles | Add to sheet |
| ProGrip 717 grips | budget | $18 eBay — $17.98 checked Oct 14 (opens in new tab) | fits: verifiedUniversal open-end race grip, 122 mm long, fits 22-25 mm bars; the RA version is 125 mm | Add to sheet |
| Crash Protection7 fitCrash bungs, axle sliders, and a rectifier-area check (gen 1) are the priorities. R&G and Evotech cover the model; budget brands are serviceable here given the bike's price class. | ||||
| GB Racing engine cover set | premium | $320 | fits: verified · 2016–232014–15 takes the clutch cover only; not the 2024+ 399 cc | Add to sheet |
| Evotech Performance radiator guard | premium | $110 | fits: verified · 2017+2013–16 not listed | Add to sheet |
| R&G engine case cover kit | mid | $220 | fits: verified · 2013–23Not the 2024+ 399 cc | Add to sheet |
| R&G Aero frame sliders | mid | $140 | fits: verified · 2013+2013–23 kit and a separate 2024+ kit | Add to sheet |
| T-Rex Racing engine case covers | budget | $140 | fits: verified · 2016–26Not 2013–15 | Add to sheet |
| R&G fork protectors | budget | $60 | fits: verified · 2013+2013–23 kit, 2024+ kit, 2026+ APEX version | Add to sheet |
| R&G bar end sliders | budget | $55 | fits: verified · 2024+BE0085 | Add to sheet |
| Tail Tidy & Billet4 fitR&G and Evotech make clean gen-specific kits; plenty of budget options exist. Recheck bolt torque after installs — see gotchas. | ||||
| Evotech Performance tail tidy | premium | $230 | fits: verified · 2017+2013–16 not listed | Add to sheet |
| New Rage Cycles fender eliminator | mid | $180 | fits: verified · 2017–22 & 2024+2023 and pre-2017 not covered | Add to sheet |
| R&G tail tidy | mid | $160 | fits: verified · 2013+2024+ has its own kit | Add to sheet |
| Competition Werkes fender eliminator | mid | $120 | fits: verified · 2017–232013–16 and 2024+ not covered | Add to sheet |
| Bodywork3 fitWindscreen: Puig flyscreens are the popular wind fix for the upright Duke position — model-year specific mounts, so match your generation. | ||||
| Puig New Generation sport screen (naked bikes) | mid | $160 | fits: verified · 2013–26 | Add to sheet |
| MRA race windscreen | mid | $140 | fits: verified · 2013–162017–23 none; 2024+ gets only the Sport screen | Add to sheet |
| Stompgrip tank grip kit | budget | $65 | fits: verified · 2013–16Not 2017+ | Add to sheet |
| Quickshifter3 fitGen 3 (2024+) has optional factory Quickshifter+ that can be activated; gen 2 has no factory option and uses aftermarket units (Healtech iQSE-class). Verify generation before buying either route. | ||||
| Translogic Intellishift quickshifter | premium | $500 | fits: verified · 2009+Kit shared with Duke 125/200/250; TLS-QSXi-D-DCS-85 | Add to sheet |
| Healtech iQSE quickshifter (with harness) | mid | $370 | fits: verified390 Duke 2014–20 (QSH-F2A) and 2021–26 (QSX-F2A) | Add to sheet |
| Annitori QS PRO 3 quickshifter | mid | $240 | fits: verifiedNo year limit given | Add to sheet |
| Drivetrain5 fitStock 520 chain means sprocket experimentation is as cheap as it gets. Standard advice applies: avoid going too small on the front sprocket; make changes at the rear when possible. | ||||
| DID ERV7 520 race chain | premium | $300 | fits: reported · 2014–26520 pitch | Add to sheet |
| EK MVXZ2 520 chain | mid | $180 | fits: reported · 2013–26520 pitch | Add to sheet |
| Driven aluminum rear sprocket | mid | $85 | fits: verified · 2013–22520 pitch | Add to sheet |
| Superlite steel rear sprocket | mid | $60 | fits: verified · 2014–26RS7 steel, 520 | Add to sheet |
| DID 520VX3 X-ring chain | budget | $180 | fits: reported · 2014–26520 pitch | Add to sheet |
| Electronics7 fit | ||||
| AiM MXS Strada race dash | premium | $1,400 | fits: reportedUniversal dash; kits ship with a 14-pin CAN or OBD CAN+K harness; AiM claims 2,000+ supported ECUs | Add to sheet |
| AiM Solo 2 DL lap timer | premium | $850 eBay — $899.00 checked Oct 14 (opens in new tab) | fits: reportedUniversal GPS lap timer; the DL adds ECU logging via CAN/RS232/K-line; dedicated bike kits available | Add to sheet |
| Antigravity RE-START lithium battery | premium | $220 | fits: verified · 2013–23ATZ10 RE-START; 2024+ not listed | Add to sheet |
| AiM Solo 2 lap timer | mid | $480 eBay — $499.00 checked Oct 14 (opens in new tab) | fits: verifiedUniversal GPS lap timer; no ECU connection | Add to sheet |
| Starlane Stealth-5 lap timer | mid | $460 eBay — $465.40 checked Oct 14 (opens in new tab) | fits: verifiedWires to the bike's 12 V battery (cable supplied) or an optional battery case; mounts included | Add to sheet |
| Shorai LFM lithium battery | mid | $180 | fits: verified · 2015–18LFM14A4; 2019+ not listed | Add to sheet |
| Healtech Brake Light Pro flasher module | mid | $65 | fits: verified · 2014–26BLP-U01 | Add to sheet |
Some links may earn Unstocked a commission at no cost to you. Prices shown are typical street prices — always verify fitment and price at the retailer. Model-specific parts (exhausts, rearsets, bodywork) can run 2–3× between bikes — the sheet shows a typical figure.
What the 390 Duke runs stock
| Part | What it came with | Years |
|---|---|---|
| Suspension | WP 43 mm upside-down fork (non-adjustable) 43 mm WP USD fork with no external adjusters; WP monoshock with preload adjustment | 2013–2016 (US 2015–16) |
| Suspension | WP APEX 43 mm open-cartridge fork (non-adjustable) 142 mm travel, no external adjusters; WP APEX monoshock with preload adjustment, 150 mm travel | 2017–2023 |
| Suspension | WP APEX 43 mm open-cartridge fork, compression + rebound adjustable 150 mm travel; off-centre WP APEX separate-piston shock with 5-step rebound clicker and preload adjustment | 2024+ |
| Brakes | single 300 mm disc, 4-piston radial fixed caliper 300 mm front / 230 mm rear discs, ByBre calipers per press; Bosch 9MB two-channel ABS | 2013–2016 (US 2015–16) |
| Brakes | single 320 mm disc, ByBre 4-piston radial caliper 320 mm front / 230 mm rear (single-piston floating caliper); Bosch dual-circuit ABS with Supermoto mode — rear disc and pads differ from gen 3 | 2017–2023 |
| Brakes | single 320 mm disc, 4-piston radial caliper · 240 mm rear new 4-piston radial front caliper, 240 mm rear disc with twin-piston caliper; Cornering ABS and Supermoto ABS standard | 2024+ |
| Tires & Wheels | 110/70-17 front · 150/60-17 rear Metzeler on gen 1, Michelin Power 6 on gen 3 per KTM; 17-inch cast wheels throughout | All years |
| Electronics | ride-by-wire + TFT + Bosch ABS with Supermoto mode ride-by-wire throttle, colour TFT dash and a slipper clutch; no traction control, ride modes or IMU on this generation | 2017–2023 |
| Electronics | ride modes, launch control, 5-inch TFT, cornering ABS Street and Rain modes plus a Track mode with launch control; lean-sensitive Cornering ABS and Supermoto ABS; 5-inch bonded-glass TFT | 2024+ |
| Electronics | cornering traction control (MTC) press reports lean-sensitive traction control alongside the cornering ABS | 2024+ |
From the manufacturers' press material; entries marked reported come from other sources. Check against your exact model year. Stock parts for every bike →
Why mod a 390 Duke
The 390 Duke is the highest smiles-per-dollar machine in the catalog — light, flickable, cheap to run, and the global small-Duke aftermarket is enormous. It's also the classic first bike that owners keep modifying instead of replacing, which makes every $100 part decision feel consequential.
390 Duke street mods, in order
Tail tidy
The stock plate hanger is a diving board. Fender eliminator kits from R&G, Evotech, and the usual suspects clean it up for under $150 typical street price.
Crash bungs and axle sliders
Learner-friendly bike, learner-frequency drops. Frame sliders/crash bungs plus axle sliders are the standard insurance package, and the 390 catalog is deep and cheap.
Levers and mirrors
Shorty adjustable levers and better mirrors — small-bike lever fitment is shared widely across the small-Duke family, so options are plentiful.
Slip-on, honestly assessed
The Akrapovič slip-on (also sold through KTM PowerParts) is the popular pick. On the 373 the cat and pre-muffler live under the engine, so an end can changes sound and looks far more than power.
Fueling only if you go deeper
Piggyback fueling (PowerTRONIC is the known 390 unit) or dealer-level tuning matters once you touch the airbox or headers. Slip-on-only bikes can skip it.
Wind and comfort touches
A Puig-style flyscreen, grippier seat, and heated grips if you commute — the 390 is a do-everything bike and these are the mods owners keep longest.
390 Duke track build, in order
Tires above all
The single biggest lap-time purchase: modern sport rubber (Rosso IV class, or Q5 for dedicated track days) over the OEM-spec Metzelers transforms the bike's limits.
Brake pads and a braided line
The ByBre radial caliper with a 320 mm disc (gen 2+) responds well to sintered pads, a braided line, and fresh fluid — $150 well spent before any hardware talk.
Spring it for your weight
Gen 2 runs a non-adjustable WP APEX fork and preload-only shock. Springs for your weight, then cartridge kits (Andreani class) and a quality rear shock — the small-bike race scene has proven paths here.
Gearing games
Already on a 520 chain, so sprocket experiments are cheap. A tooth here or there matched to your local track is the classic lightweight-class tuning lever.
Ergonomics and protection
Rearsets exist for the 390 (fewer brands than the supersports — check current fitment), tank grips help corner exits, and case/crash protection keeps a small budget from becoming a big one.
Shift and data extras
Gen 3 offers factory Quickshifter+ activation; gen 2 riders add a Healtech iQSE-class unit. A basic lap timer closes the loop — on a 44 hp bike, data beats horsepower.
390 Duke fitment by year (Gen 1 (373), Gen 2 (373), Gen 3 (399))
- Gen 1 (373)2013–2016 (US 2015–16)
Original 373 cc single, halogen lighting, analog-ish dash. Community-known weak point: regulator/rectifier heat failures — used buyers check for the upgraded or relocated R/R first.
- Gen 2 (373)2017–2023
New bodywork, LED headlight, TFT dash, ride-by-wire, 320 mm front disc. The volume generation and the one most parts listings mean by '390 Duke.' Minor running changes only — fitment is stable across the run.
- Gen 3 (399)2024+
All-new 399 cc LC4c engine, new frame and swingarm, new electronics with optional factory Quickshifter+. Shares almost nothing with 2017–23 — the fitment split at 2024 is total, not cosmetic.
390 Duke gotchas — read before buying
390 Duke parts interchange
Reported by riders; verify before buying. Full chart →
- Community-reported: the RC 390 shares its engine and much of the drivetrain with the same-generation 390 Duke — engine covers, sprockets, and many service parts cross; bodywork and ergonomics don't.
- Community-reported: levers, bar ends, and many accessory fitments are shared across the small-Duke family (125/200/250/390) within a generation, which widens the parts pool considerably.
- Community-reported: the 390 Adventure shares the 373 engine architecture, so some engine-side protection and service parts cross from the Duke catalog.
KTM 390 Duke mods FAQ
Will 2017–2023 390 Duke parts fit a 2024 model?
Almost universally no. The 2024 generation brought a new 399 cc engine, frame, swingarm, and bodywork — it's a clean fitment break. Filter every part search by generation, and treat unlabeled '390 Duke' listings as pre-2024 until proven otherwise.
Does the 390 Duke need a tune after an exhaust?
With a slip-on end can, no — the cat stays and the stock ECU copes. Deeper work (header-back systems, airbox changes) benefits from fueling support, typically a PowerTRONIC-class piggyback since flash options for KTM singles are limited.
Is the 390 Duke good for track days?
It's one of the best learning platforms there is — light, forgiving, and cheap to run. The recipe is proven: sport tires, sintered pads and a braided line, and suspension sprung for your weight. It will teach you more per dollar than any liter bike.
What suspension upgrades work for heavier riders?
Start with fork springs and a rear spring rated for your weight — the stock rates suit light riders. From there, cartridge kits for the WP APEX fork and an aftermarket shock (YSS-class to WP APEX PRO by budget) are the community-validated path.
Do RC 390 parts fit the 390 Duke?
Engine-side parts often do within the same generation — the two share the powerplant (community-reported). Bodywork, subframes, ergonomics, and anything fairing-related don't cross. Verify fitment for your exact year on everything else.