NGK 3486 Spark Plug

NGK CR7EH-9 Standard Spark Plug

NGK CR7EH-9 is a standard spark plug 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 center electrode with nickel-tipped electrodes to support consistent spark delivery and stable combustion.

For drivers searching for an NGK spark plug for Honda, Toyota, or other small-engine and powersports applications, part number 3486 offers a straightforward OE-style replacement with the dimensions and heat range needed for proper engine operation.

Key Features

• Part number 3486 / NGK CR7EH-9
• Standard spark plug design for OE-style replacement
• Copper center electrode core material
• Nickel center and ground electrode tip materials
• 5,000 ohm resistance for ignition system compatibility
• Pre-gapped at .036 inch
• 10 mm thread diameter, .75 inch reach, flat seat
• 5/8 inch hex size with stud terminal
• Heat range 7 for specified engine applications

Product Details

The NGK Standard Spark Plug line is designed around original equipment standards and broad application coverage. CR7EH-9 / 3486 uses a standard ground configuration with one ground electrode, a nickel ground electrode core, and a copper core center electrode to support reliable spark transfer and everyday drivability. The 50.00 mm insulator height and .036 pre-gap help match the plug to the intended ignition setup.

This spark plug is a direct replacement choice for owners looking for an NGK spark plug for Honda, Toyota, and similar engine platforms where the specified thread size, reach, seat type, and heat range are required. Part number 3486 is also referenced as CR7EH-9 in NGK listings.

This part cross-references Anchor 3486 and AMS Automotive 4212 for the same application.

Common Issues This Part Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition performance
• Misfire symptoms related to degraded plug electrodes
• Poor fuel burn from incorrect spark plug heat range or gap
• Loss of throttle response from aging ignition components

Installation Notes and Tips

Verify the engine calls for a 10 mm thread diameter, .75 inch reach, flat seat, and heat range 7 before installation. Check the existing plug gap and ignition system specification against the .036 pre-gap on CR7EH-9 / 3486, and confirm the stud terminal style matches the vehicle’s ignition lead or coil connection.

For best results, install on a cool engine and torque to the manufacturer’s specification for the vehicle. If the old plug shows heavy deposits, oil fouling, or electrode wear, inspect the ignition system and engine condition before returning the vehicle to service.

Quality Assurance

NGK is a long-established OE supplier and manufacturer of spark plugs for domestic and import vehicles in North America. The brand’s manufacturing focus on original equipment standards and broad vehicle coverage supports consistent fit and performance across specified applications.