NGK LKAR7C-9 93961 Nickel Spark Plug for Mercury 450R/500R

NGK replacement nickel spark plugs for Mercury 250R, 300R, 450R and 500R 4.6L V8 racing boat outboard engines. Each engine will require 8 spark plugs. Spark plugs are sold individually as needed. Price is for one plug.

Purchase Includes:
(1) Spark Plug

Spark plugs are sold individually.
Price is for one plug.
Please adjust quantity as needed.

Vehicle Fitment:
Fits many Mercury Marine Outboard Engines including
• 4.6L V8 Racing Engine
• Mercury 250R
• Mercury 300R
• Mercury 450R
• Mercury 500R

Quick Spark Plug Specs:
Part Number: LKAR7C-9
Stock Number: 93961
Heat Range: 7
Thread Size: 12mm
Longevity: 30k Miles

More from NGK:
NGK standard plugs are constructed for longer life and optimum performance.
• Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
• Corrugated ribs prevent flashover
• Pure alumina silicate ceramic insulator, provides superior strength and better heat transfer
• Copper core aids in heat removal
• Triple seals prevent leakage

Shell:
Thread Diameter 12mm
Thread Pitch 1.25mm
Seat Type Gasket
Reach 26.5mm (1.04")
Hex Size 9/16" (14mm)
Terminal Type Solid
Gap .035" (0.9mm)

Center Electrode:
Material Nickel
Type Standard
Size 2.5mm
Projection Projected

Ground Electrode:
Material Nickel
Type Standard
Quantity 1

Specifications:
Resistor Yes
Resistor Value 5k Ohm

Torque Specs:
Cast Iron Block: 10.8-18 lb. ft.
Aluminum Block: 10.8-14.5 lb. ft.