Factory Workshop SpecificationsPlatform Gen: 2017–2024

2023 KTM 390 Duke Specifications & Consumables

Official workshop technical reference: fluid capacities, spark plug codes, drive chain specs, and tire inflation pressures.

Technical PassportOEM VERIFIED

Engine

373cc

Cooling

Liquid-Cooled

Final Drive

520 Chain

Engine Oil

1.60 L (1.69 US qt)

Spark Plug

Bosch VR5NEU / NGK LKAR8A-9

Front Tire

110/70R17

Gen 2017–2024

Factory Platform Compatibility: All workshop fluid capacities, maintenance milestones, torque specifications, and consumables on this specification sheet are factory-identical across model years 2017 through 2024.

SPECS-TO-CART BUNDLESFactory Direct-Fit Maintenance Bundles Available

1-Click verified Motul engine oil service kits, race filters, spark plugs, and brake fluid pre-measured for this 2023 KTM 390 Duke.

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Select Model Year:(Active: 2023)
8 Production Years (2017–2024)

2017 2018 2019 2020 2021 2022 2023 2024

Engineering Subsystem Workbenches & Calculators

Dedicated deep-dive diagnostic tools, torque matrices, wiring pinouts, and calculators tailored for 2023 KTM 390 Duke.

10 Dedicated Engineering Spoke Pages

Subsystem Guide/torques

Fastener Torques

Engine drain plug, axle spindles, caliper mounts, triple clamp pinch bolts & thread lubrication derating guide.

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Subsystem Guide/fluids

Fluids & Capacities

Oil: 1.60 L (1.69 US qt) • Coolant: 1.20 L (1.27 US qt) • Brake: DOT 4

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Subsystem Guide/fuses-relays

Fuses & Relays

Main: 30A Blade / Starter Relay • Location: N/A

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Subsystem Guide/compression

Compression & Leakdown

Ratio: 12.6:1 • Std: 165-205 PSI • Limit: 135 PSI

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Subsystem Guide/valves

Valve Clearances

Intake: N/A mm • Exhaust: N/A mm

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Subsystem Guide/fuel-delivery

Fuel Delivery & TB Sync

Idle: N/A • Rail Pressure: N/A • Vacuum: N/A

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Subsystem Guide/electrical

Charging & Battery

Battery: YTX9-BS • CCA: 135 • Regulated: 14.2 - 14.8 V DC (at 5,000 RPM with High Beam)

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Subsystem Guide/tires

Tires & Gearing

Front: 110/70R17 • Rear: 150/60R17

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Subsystem Guide/suspension

Suspension & Sag

Front Travel: 142 mm • Rear Travel: 150 mm

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Subsystem Guide/maintenance

Maintenance Schedule

Oil: Every 4,650 miles (7,500 km) mi • Valves: N/A • Plugs: Every 9,300 miles (15,000 km) mi

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Fluids & Service Capacities

Shop Fluids →

Engine Oil (Drain & Filter Change)1.60 L (1.69 US qt)

Engine Oil (Drain Only)1.50 L (1.59 US qt)

Recommended Oil ViscosityMotorex Formula 4T 15W-50 JASO MA2

Coolant System Capacity1.20 L (1.27 US qt)

Brake Fluid StandardDOT 4

Drivetrain, Chain & Gearing

Gearing Calculator →Shop Chains & Sprockets →

Drive Chain Pitch520

Chain Link Count112 Links

Front Sprocket Teeth15T

Rear Sprocket Teeth45T

Final Drive Configuration520 Pitch Chain

Ignition & Electrical Specifications

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OEM Spark Plug Part NumberBosch VR5NEU / NGK LKAR8A-9

Electrode Spark Plug Gap0.8 mm (0.031 in)

OEM Battery Reference CodeYTX9-BS

Battery Output & Rating12V 8Ah 135 CCA

Spark Plug Inspection Interval9,300 miles (15,000 km) miles

Wheels, Tires & Inflation Pressures

Matched 2-Tire Sets →

Front Tire Dimensions110/70R17

Cold Front Inflation Pressure29 PSI (Cold)

Rear Tire Dimensions150/60R17

Cold Rear Inflation Pressure32 PSI (Cold)

OEM Wheel Rim Widths (F / R)3.50" / 5.50"

Verified OEM Wheel Fitment: 110/70-17 (F) + 150/60-17 (R)

Shop In-Stock Matched Pairs→

Official NHTSA Safety Recalls & Technical Bulletins

2 Active Campaigns

U.S. Department of Transportation compliance database (Title 49 U.S.C. Chapter 301).

Verify VIN on NHTSA.gov

The U.S. National Highway Traffic Safety Administration reports 2 safety recall campaigns associated with this platform. Independent repair shops and riders should confirm that authorized dealership warranty remedies have been applied.

NHTSA #25V740000FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP

Received: 30/10/2025▼

Defect Description

KTM North America, Inc. is recalling certain 2024 390 Duke, 250 Duke, 990 Duke, Husqvarna Vitpilen 401, and Husqvarna Svartpilen 401 motorcycles. The seal on the fuel filler cap may develop cracks and leak fuel.

Safety Hazard / Consequence

A fuel leak increases the risk of fire or injury.

Factory Remedy & Repair Action

Dealers will inspect and replace the fuel cap gasket, free of charge. Owner notification letters were mailed December 15, 2025. Owners may contact KTM customer service at 1-888-985-6090. Vehicle Identification Numbers (VINs) involved in this recall will become searchable on NHTSA.gov March 31, 2026.

NHTSA #25V825000ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM):SOFTWARE

Received: 01/12/2025▼

OEM Workshop Archives

Official Factory Service Bulletins & Field Updates

1 Documented Bulletin

Bulletin #KTM-25V598Safety Recall KTB2606 / HTB2603: Sealed E-Throttle Twist Grip Assembly & Adaptation Reset

Source: KTM_Recall25V598_RCRIT-25V598-9541.pdf

Mandated Torques:E-Throttle Housing Clamp Screws (2x M4): 3.5 N·m (31 in-lb)Handlebar End Weight Screw (M6): 20 N·m (15 lb-ft)Handlebar Switchgear Screws (M4): 2.0 N·m (18 in-lb)Front Brake Master Cylinder Clamp (M6): 5 N·m (44 in-lb)

Consumable Specs:N/A

Genuine Part Numbers:Exchange Throttle Cmpl. (390 Adv / Duke / 401) (95802010044)Exchange Switch Control RH (RC 390) (94811074000)EJOT PT Screw K40×12 (0081040121)Handlebar Grip Right (90102021000)

NHTSA Recall 25V-598 & 26V-196Bulletins KTB2606 & HTB2603

KTM 390 & Husqvarna 401 Weather-Sealed E-Throttle Twist Grip Assembly

Ride-by-wire electronic twist grip IP67 sealing countermeasure, locator pin engagement, and XC-2 adaptation reset.

Safety Recall RemedyHousing 3.5 N·m / Bar End 20 N·m

Genuine Part Numbers:9580201004494811074000008104012190102021000

Click any component or torque callout above to inspect e-throttle waterproofing details, bar end clearance, and XC-2 adaptation reset.

1-Click Factory Service KitOEM Spec Fluid Capacities Matched

Workshop Maintenance Kit & Factory Fluids

Authentic factory-grade motor oil, oil filter, and high-temp brake fluid matched precisely to 2023 KTM 390 Duke capacities.

Full Kit Subtotal

$74.50

SPECS-TO-CART BUNDLESDedicated Direct-Fit Maintenance Bundles Available

Explore interactive 1-click oil change packs, brake flush kits & major tune-up bundles pre-measured for this 2023 KTM 390 Duke.

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15W-50 JASO MA2

Silkolene Pro 4 4T Synthetic Oil 15W-50 (4 Liter)

4-Liter Factory Full Jug

Matches factory 15W-50 spec (Oil spec: 1.60 L (1.69 US qt))

Item Price

$68.95

DOT 4 Synthetic Formula

EBC High-Performance DOT 4 Synthetic Brake Fluid

8.8 oz (250 ml) Workshop Bottle

Meets & exceeds factory DOT 4 specifications

Item Price

$5.55

Factory OEM Spark Plug Spec

Bosch VR5NEU / NGK LKAR8A-9

Gap: 0.8 mm (0.031 in)

Inspection milestone: 9,300 miles (15,000 km) miles. Exact factory part specification.

Authentic OEM Reference

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Complete Workshop Maintenance Package3 Essential Service Items

Includes 15W-50 JASO MA2 engine oil (4-Liter Factory Full Jug), high-flow filter & DOT 4 fluid.

Kit Total

$74.50

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