NGK 91909 LMAR8BI-9 Laser Iridium Spark Plug for Suzuki V-Strom/GSX-8S/GSX-8R

Vehicle Fitment

• 2014-2025 Suzuki DL1000 V-Strom 1000 (Base, ABS, XT, XT Adventure, GT, X)
• 2020-2025 Suzuki DL1050 V-Strom 1050 (Base, XT, XT Adventure, DE, DE Adventure, RR)
• 2023-2025 Suzuki DL800 V-Strom 800DE (Base, Adventure)
• 2024-2025 Suzuki DL800 V-Strom 800 (Base, Touring, RQ)
• 2023-2026 Suzuki GSX-8S (Base)
• 2024-2026 Suzuki GSX-8R (Base)

Fitment Notes

• OEM Suzuki part cross-reference: 09482-00635
• 2 plugs required per motorcycle (parallel-twin engine)
• Plug is pre-gapped at 0.035" (0.9mm); verify against your specific model's service manual before installation
• No known automotive fitment - motorcycle/powersports application only

Features

• Laser-welded fine-wire iridium alloy center electrode for consistent, high-energy spark
• Platinum disc on ground electrode for extended service life in distributorless ignition systems
• Trivalent metal plating provides superior anti-corrosion and anti-seizing protection
• Pure alumina silicate ceramic insulator for enhanced strength and heat transfer
• 98% pure copper core aids heat removal and prevents plug overheating
• Triple seals prevent combustion leakage around the shell

Specifications

• NGK Part Number: LMAR8BI-9
• Thread Diameter: 10mm
• Thread Pitch: 1.0mm
• Reach: 26.5mm (1.04")
• Hex Size: 9/16" (14mm)
• Seat Type: Gasket
• Terminal Type: Threaded Stud
• Pre-Set Gap: 0.035" (0.9mm)
• Center Electrode Material: Iridium (Fine Wire)
• Torque Spec - Cast Iron Head: 7.2-10.8 lb-ft
• Torque Spec - Aluminum Head: 7.2-8.7 lb-ft

Included Components

• 1x NGK LMAR8BI-9 Laser Iridium Spark Plug (91909)

Product Description

The NGK 91909 (LMAR8BI-9) is an OEM-spec Laser Iridium spark plug engineered specifically for Suzuki's parallel-twin powersport platforms, including the V-Strom 800, 1000, and 1050 adventure series, as well as the GSX-8S and GSX-8R sport bikes. Originally contracted by Suzuki exclusively for these models, this plug delivers superior ignitability over standard nickel or platinum plugs, thanks to its precision laser-welded fine-wire iridium center electrode and platinum-tipped ground electrode. Two plugs are required per motorcycle.

Designed to OE specifications, this plug installs as a direct drop-in replacement requiring no modifications. The iridium alloy's extremely high melting point and resistance to spark erosion make it ideal for modern high-revving engines, offering long service life and stable performance across all riding conditions.