NGK Laser Iridium spark plugs offer the best combination of performance and longevity. Engineered specifically for OE applications, Laser Iridium spark plugs are tested to the highest standards to ensure quality and durability.

Iridium tipped center electrode provides durability six times harder than platinum. NGKs high grade pure alumina ceramic and 98 percent pure copper core prevents the spark plug from overheating while providing reliable starts. Most Laser Iridium spark plugs feature a platinum pad on the ground electrode for even wear in distributorless ignition systems.

This 6 pack of NGK 4212/ILFR6G-E OE Series Laser Iridium Spark Plugs is compatible with the following outboard models:

Compatible with Mariner
Verado 225 HP L6 2006-2011 Model Years
Pro Verado 250 HP L6 2006-2011 Model Years
Verado 250 HP L6
Verado 275 HP L6 2006-2011 Model Years
Pro Verado 300 HP L6 2006-2011 Model Years
Verado 300 HP L6

Compatible with Mercury
Pro Verado 200 HP L6
Verado 200 HP L6
Verado 225 HP L6
Pro Verado 250 HP L6
Verado 250 HP L6
Verado 275 HP L6
Pro Verado 300 HP L6
Verado 300 HP L6
Pro Verado 350 HP L6
SCi Verado 350 HP L6
Verado 350 HP L6
Verado 400 HP L6

Shell
Thread Diameter: 14mm
Thread Pitch:25mm
Seat Type: Gasket
Reach:5mm (1.04")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .031" (0.8mm)

Center Electrode
Material: Iridium
Type: Fine Wire
Size:6mm
Projection: Projected

Ground Electrode
Material: Platinum
Type: Standard

Specifications
Resistor: Yes
Resistor Value: 10k Ohm
Heat Range: 6
Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.