NGK 1643 LKR7E Nickel Spark Plug
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Precision spark plug for smooth combustion
The NGK 1643 LKR7E Nickel Spark Plug is a resistor-type plug engineered for specific Yamaha 4-stroke outboard motors. Featuring a 26.5 mm reach and a 0.9 mm factory-set gap, it ensures precise ignition in high-output Yamaha applications.
NGK 1643 LKR7E Nickel Spark Plug Features:
- Built to NGK standards for long life and consistent performance
- High-quality OEM replacement
- Trivalent metal plating for strong anti-corrosion and anti-seizing protection
- Corrugated ribs help prevent flashover
- Pure alumina silicate ceramic insulator for strength and efficient heat transfer
- Copper core aids heat dissipation
- Triple seals help prevent gas leakage
NGK 1643 LKR7E Nickel Spark Plug Specifications:
Shell:
- Model Number: LKR7E
- Part Number: 1643
- Thread Diameter: 12 mm
- Thread Pitch: 1.25 mm
- Seat Type: Gasket
- Reach: 26.5 mm (1.04")
- Hex Size: 16 mm (5/8")
- Terminal Type: Solid
- Overall Height: ISO
- Gap: 0.9 mm (0.035")
Centre Electrode:
- Material: Nickel
- Type: Standard
- Size: 2.5 mm
- Design: Projected
Ground Electrode:
- Material: Nickel
- Type: Standard
- Quantity: 1
Electrical Performance:
- Resistor: Yes (5K Ohm)
- Heat Range: 7
Installation:
- Torque (Aluminium): 15-20 Nm (10.8-14.5 lb-ft)
- Torque (Cast iron): 15-24 Nm (10.8-18 lb-ft)
Compatible Yamaha Outboards:
- F70A: 4-cylinder 4-stroke models
- F40G: 4-stroke models
- International: Various 40HP and 70HP Yamaha 4-stroke models
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