NGK 4216 Spark Plug

NGK Racing Spark Plug 4216 Overview

NGK Racing Spark Plug 4216 is built for ignition systems that need a surface-discharge design with stable electrical performance. It uses a copper center electrode core, nickel center electrode tip, and nickel ground electrode core to support consistent spark delivery in demanding engine conditions.

For drivers searching for an NGK spark plug for performance tuning, racing ignition service, or a direct replacement by part number 4216, this plug is a technical fit for applications that call for a 10 heat range, 10 mm thread diameter, 0.75 reach, and flat seat design.

Key Features

• Surface-discharge ground electrode design for controlled spark exposure
• 5000 ohm resistance for ignition circuit stability
• Copper core center electrode for efficient heat transfer
• Nickel center and ground electrode tip materials
• 10 mm thread diameter with 5/8 hex size
• Flat seat construction with 0.75 reach
• Pre-gapped to .012
• Stud terminal type

Product Details

NGK’s racing spark plug line is aimed at engines that need precise ignition characteristics and durable construction under higher operating demands. Part number 4216, also identified as R0045Q-10, reflects NGK’s long OE manufacturing background and its focus on consistent ignition performance across automotive, motorcycle, marine, and small engine applications. If you are cross-shopping ignition service parts for a performance build or looking up NGK 4216 for a specific engine setup, this plug provides the core specs needed for accurate matching.

This part cross-references AMS Automotive 4216 for the same application.

What It Helps Address

• Misfire caused by worn or inconsistent spark plugs
• Hard starting related to weak ignition output
• Rough idle from degraded spark delivery
• Loss of throttle response from plug wear or heat mismatch
• Ignition instability in performance or racing use

Installation Notes and Tips

Verify the engine’s required thread diameter, reach, seat type, and heat range before installation. Confirm the gap specification against the engine build and ignition setup, since this plug is pre-gapped to .012. Use the correct 5/8 hex socket and tighten to the vehicle manufacturer’s torque specification. For vehicle-specific searches, confirm the application by engine code and ignition requirements when looking up NGK 4216 for Honda Civic, Toyota Corolla, or similar compact-car platforms.

Quality Assurance

NGK is a major OE spark plug supplier in North America with decades of automotive manufacturing experience and broad coverage across domestic and import applications. Part number 4216 is produced to support original-equipment-level durability and operational consistency in ignition service.