NGK 91909 LMAR8BI-9 Laser Iridium Spark Plug 10mm Heat Range 8

The NGK 91909 Laser Iridium spark plug (NGK part number LMAR8BI-9) is a fine-wire iridium spark plug. It is built for long service life and strong ignition performance. The iridium-tipped center electrode gives reliable starts, a stable spark and good durability. NGK describes it as six times harder than platinum. This plug is a direct replacement for the original spark plug and is also an upgrade option for riders and drivers who want longer-lasting ignition components.

Key Features:

• Fine-wire iridium alloy center electrode, 0.6 mm, for consistent spark and high durability
• Platinum ground electrode with a taper-cut design
• Pure alumina silicate ceramic insulator for strength and heat transfer
• Copper core helps remove heat and prevent overheating
• Trivalent metal plating resists corrosion and seizing
• Corrugated insulator ribs help prevent flashover
• Triple seals prevent leakage
• Built-in 5k ohm resistor to suppress radio interference

Specifications:

• Part number: NGK 91909 / LMAR8BI-9
• Thread: 10 mm diameter, 1.0 mm pitch (M10x1.0)
• Reach: 26.5 mm (1.043 in.)
• Seat type: Flat, with gasket
• Hex size: 14 mm (9/16 in.)
• Heat range: 8
• Gap: 0.035 in. (0.9 mm)
• Terminal: Threaded stud
• Resistor value: 5k ohm
• Torque: 7.2-10.8 lb-ft in cast iron heads, 7.2-8.7 lb-ft in aluminum heads
• Cross-reference: Suzuki 09482-00635

NGK is a leading original equipment spark plug supplier. The Laser Iridium line is designed to balance performance and longevity.