This package includes four NGK LKAR7C-9 standard nickel spark plugs for engines specifically requiring NGK stock number 93961. Each resistor-type plug features a solid copper core, nickel-alloy electrodes, a projected insulator design, and a factory gap of approximately 0.9 mm.
LKAR7C-9 is primarily associated with select Mercury Marine outboard and racing-engine applications. NGK does not currently associate this plug with a specific automotive application, so buyers should verify the required spark-plug number using the engine manufacturer’s service information before ordering.
Features
- NGK standard nickel spark-plug construction
- Solid copper core supports heat dissipation and electrical conductivity
- Nickel-alloy center and ground electrodes
- Projected insulator configuration
- Resistor-type design helps suppress electrical interference
- High-grade ceramic insulator
- Trivalent metal-plated shell helps resist corrosion
- Cold-rolled threads help reduce the risk of cylinder-head thread damage
- Flat gasket seat with sealing washer
- Solid, non-removable terminal
- NGK plug number LKAR7C-9
- NGK stock number 93961
Specifications
- Plug type: Standard resistor spark plug
- Center-electrode material: Nickel alloy with copper core
- Ground-electrode material: Nickel alloy
- Ground-electrode quantity: 1
- NGK heat range: 7
- Thread diameter: 12 mm
- Thread pitch: 1.25 mm
- Thread reach: 26.5 mm
- Hex size: 14 mm or 9/16 inch
- Seat type: Flat gasket seat
- Factory gap: Approximately 0.9 mm or 0.035–0.036 inch
- Resistance: Approximately 5,000 ohms
- Terminal type: Solid and non-removable
Application Information
Use only in engines that specifically call for NGK LKAR7C-9, stock number 93961, or a confirmed equivalent manufacturer number. This plug is commonly cataloged for select Mercury Marine outboard and racing-engine applications, including certain 4.6L V8 configurations.
Known Mercury applications may include select 250R, 300R, 450R, and 500R engines. Application varies by engine model, production date, calibration, and serial number. Confirm the required plug number directly from the Mercury service manual, parts catalog, or existing spark plug before ordering.
Package quantity notice: This listing contains four spark plugs. A V6 engine typically requires six plugs, while a V8 engine typically requires eight. Purchase two sets if eight LKAR7C-9 plugs are required. This four-plug set may also service a four-cylinder engine only when that engine specifically requires LKAR7C-9.
Cross-Reference Information
- NGK plug number: LKAR7C-9
- NGK stock number: 93961
- Common Mercury reference: 8M0135348
- Common Mercury reference: 8M0204737
Cross-reference numbers are provided only as a shopping aid. Match all specifications and confirm the current manufacturer part number for the exact engine before installation.
Recommended Use
Recommended as a standard replacement for worn, fouled, damaged, or service-due LKAR7C-9 spark plugs. Spark plugs should be inspected and replaced at the interval specified by the engine manufacturer.
What’s Included
- 4 NGK LKAR7C-9 standard nickel spark plugs
- NGK stock number
Proposition 65 Warnings.
Cancer and Reproductive Harm. See details below.
Items that are not CARB Legal will not be sold and ship to California or CARB states.
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