NGK LKAR8AI-9 6706 Laser Iridium Spark Plug KTM 450 SX-F 500 EXC Husqvarna

Vehicle Fitment

• 2009-2014 Husaberg FE 390 (Base)
• 2009-2014 Husaberg FE 450 (Base)
• 2009-2015 Husaberg FE 501 (Base)
• 2009-2012 Husaberg FE 570 (Base)
• 2010-2012 Husaberg FX 450 (Base)
• 2014-2015 Husqvarna FC 450 (Base)
• 2014-2016 Husqvarna FE 450 (Base)
• 2014-2016 Husqvarna FE 501 / FE 501S (Base)
• 2015 Husqvarna FS 450 (Base)
• 2017 Husqvarna FR 450 Rally (Base)
• 2008-2011 KTM 400 EXC (Base)
• 2010 KTM 400 XC-W (Base)
• 2013-2019 KTM 450 SX-F (Base)
• 2013 KTM 450 SX-F Factory Edition (Base)
• 2020-2023 KTM 450 SX-F Factory Edition (Base)
• 2021-2026 KTM 450 SMR (Base)
• 2008-2021 KTM 450 XC-F (Base)
• 2008-2011 KTM 450 XC-W (Base)
• 2010-2011 KTM 450 XC-W Six Days (Base)
• 2012-2022 KTM 500 EXC (Base)
• 2016 KTM 500 EXC Six Days (Base)
• 2017-2021 KTM 500 EXC-F (Base)
• 2020-2021 KTM 500 EXC-F Six Days (Base)
• 2020-2022 KTM 500 XCF-W (Base)
• 2008-2011 KTM 530 EXC (Base)
• 2009-2011 KTM 530 XC (Base)
• 2013-2026 KTM 125 Duke (Base)
• 2012-2016 KTM 200 Duke (Base)
• 2013-2026 KTM 390 Duke (Base)
• 2015 Husqvarna 390 Duke (Base)
• 2008-2012 KTM 690 Duke (Base)
• 2010-2011 KTM 690 Duke R (Base)
• 2008-2015 KTM 690 Enduro (Base)
• 2009-2013 KTM 690 Enduro R (Base)
• 2007-2013 KTM 690 SMC (Base)
• 2009-2011 KTM 990 Supermoto R (Base)
• 2010-2013 KTM 990 Super Duke R (Base)

Fitment Notes

• Designed for powersports (motorcycle/enduro/supermoto) applications only - not for automotive use.
• Uses a 12mm thread - confirm thread size before ordering. Do not substitute for the more common 14mm automotive plug.
• Replaces KTM OEM part number 75039093000.
• Sold individually (1x plug per unit); 1 plug required per engine on all listed single-cylinder and single-spark applications.
• Pre-gapped at 0.036" (0.9mm) from factory; always verify gap before installation.

Features

• Laser-welded fine wire iridium center electrode delivers a precise, stable spark with reduced voltage requirements - ideal for the high-revving engines in KTM's MX, enduro, and street platforms.
• Platinum disc welded to the ground electrode provides slow, even wear for extended service life in demanding off-road and racing conditions.
• Heat Range 8 - colder than standard - manages electrode temperatures in high-output, high-compression single and parallel-twin powersports engines.
• 12mm thread with flat gasket seat threads directly into KTM and Husaberg/Husqvarna compact cylinder head designs.
• Trivalent metal shell plating provides superior anti-corrosion and anti-seizing protection for clean removal in tight-access engine bays.
• High-grade pure alumina ceramic insulator and copper core prevent overheating while supporting reliable cold starts in all conditions.
• Built-in 5K Ohm resistor suppresses EMI/RFI interference to protect modern electronics and fuel injection systems on listed models.
• OE-equivalent design - direct replacement for KTM OEM part 75039093000.

Specifications

• NGK Part Number: LKAR8AI-9
• NGK Stock Number: 6706
• Plug Type: Laser Iridium (Single Iridium Tip / Platinum Ground)
• Thread Diameter: 12mm
• Thread Pitch: 1.25mm
• Seat Type: Flat (Gasket)
• Thread Reach: 26.5mm (1.04")
• Hex Size: 9/16" (14mm)
• Terminal Type: Solid (Non-Removable)
• Pre-Set Gap: 0.036" (0.9mm)
• Center Electrode Material: Iridium Fine Wire
• Ground Electrode: Nickel Core / Platinum Disc
• Resistor: Yes - 5,000 Ohm
• Manufacturer Heat Range: 8
• KTM OEM Replacement: 75039093000

Included Components

• 1x NGK LKAR8AI-9 Laser Iridium Spark Plug (pre-gapped at 0.036" / 0.9mm)

Product Description

The NGK LKAR8AI-9 (Stock No. 6706) is a Laser Iridium spark plug engineered as the OEM-equivalent replacement for KTM, Husaberg, and Husqvarna powersports applications spanning motocross, enduro, supermoto, and street platforms. It replaces KTM OEM part 75039093000 directly and covers a wide range of 125cc to 990cc single-cylinder and parallel-twin engines used across the 450 SX-F, 500 EXC-F, 690 Duke, 690 Enduro, 990 Super Duke R, and many more models from 2007 through 2026. The 12mm thread is specific to these compact powersports cylinder head designs - it is not interchangeable with standard 14mm automotive plugs.

The laser-welded iridium center electrode and platinum ground disc provide precise, stable ignition across the wide RPM range of these performance-focused engines, while the Heat Range 8 rating keeps electrode temperatures in check under the high compression and aggressive cam profiles typical of KTM's 4-stroke racing platforms. Pre-gapped at 0.036" from the factory, these plugs install as a direct drop-in replacement - 1 plug per vehicle on all listed applications.