NGK 4786 Spark Plug

NGK 4786 Standard Spark Plug

The NGK 4786 standard spark plug is built for dependable ignition performance in a wide range of domestic and import applications. As part of the NGK Standard Spark Plug line, it uses a copper core center electrode, nickel tip materials, and a 0.036 pre-gap to support consistent spark delivery.

Compatible With select vehicle applications that call for NGK LKAR8A-9, this spark plug is a direct-fit service part for routine ignition maintenance. It is commonly searched as an NGK spark plug for Honda Civic and similar import applications, and the 4786 part number is the key identifier for ordering and cross-reference matching.

Key Features

• NGK Standard Spark Plug line for OE-style service replacement
• Part number 4786 / LKAR8A-9
• Copper center electrode core material for stable conductivity
• Nickel center and ground electrode tip materials
• Standard ground electrode design with one ground electrode
• 0.036 pre-gap size
• 5000 ohm resistance
• 12 mm thread diameter, 26.5 mm reach, flat seat
• 14 mm hex size and non-removable nut terminal
• Manufacturer heat range 8

Product Details

NGK is a major OE supplier of spark plugs in North America, and the Standard Spark Plug line reflects that original-equipment focus. The 4786 spark plug is engineered with a copper core center electrode, nickel tip construction, and standard ground configuration to support reliable ignition performance in everyday driving conditions. For shoppers comparing NGK 4786, LKAR8A-9, or a standard replacement spark plug for Honda Civic and other import vehicles, this part provides the core specifications needed for accurate match-up.

This part cross-references AMS Automotive 4786 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn spark plug electrodes
• Rough idle from inconsistent spark delivery
• Misfire conditions related to aged ignition components
• Reduced throttle response from degraded plug performance
• Maintenance replacement for scheduled tune-up service

Installation Notes

Verify the required plug specification, including thread diameter, reach, seat type, and heat range, before installation. Check the gap against the vehicle service specification before use, and confirm the terminal style matches the ignition lead or coil-on-plug connection. For fitment-based searches, this NGK 4786 spark plug is commonly referenced for Honda Civic and other vehicles that specify LKAR8A-9.

Quality Assurance

NGK manufactures spark plugs with OE-level standards and broad coverage across automotive, motorcycle, marine, and small engine applications. The 4786 part number is backed by NGK’s long-standing ignition expertise and manufacturing focus on durability and consistent operational performance.