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 3 pack of NGK 5899/IZFR5J OE Series Laser Iridium Spark Plugs is compatible with the following outboard models:

Compatible with Mariner
Optimax 115 HP L3 2006-2011 Model Years
Optimax 125 HP L3
Optimax 75 HP 1.5L L3
Optimax 90 HP 1.5L L3

Compatible with Mercury
Optimax Pro SX 115 HP 1.5L L3
Optimax 115 HP 1.5L L3
Optimax 125 HP 1.5L L3
Optimax 300XS 300 HP 3.2L L3
Optimax 75 HP 1.5L L3
Optimax Jet 80 HP 1.5L L3
Optimax 90 HP 1.5L L3

Product Specifications:

Shell
Thread Diameter: 14mm
Thread Pitch:25mm
Seat Type: Gasket
Reach: 19mm (3/4")
Hex Size: 5/8" (16mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .031" (0.8mm)

Center Electrode
Material: Iridium
Type: Fine Wire
Size:0mm
Projection: Extended Projection

Ground Electrode
Material: Platinum
Type: Standard

Specifications
Resistor: Yes
Resistor Value: 5k Ohm
Heat Range: 5
Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.