NGK 4374 Spark Plug

NGK CR8EKB Spark Plug Overview

The NGK CR8EKB spark plug is a Standard Spark Plug built for dependable ignition performance in a wide range of motorcycle, marine, and small engine applications. As part number 4374, it features a copper center electrode core, nickel center electrode tip, and a nickel ground electrode design for consistent spark delivery.

NGK’s Standard Spark Plug line focuses on OE-style construction and reliable operation. This plug uses a flat seat, 10.00 mm thread diameter, 0.75 reach, 5/8 hex, and a pre-gap size of .028 for applications that call for those specifications.

Key Features

• NGK part number 4374, also identified as CR8EKB
• Standard spark plug design for OE-style replacement needs
• Copper center electrode core for stable conductivity
• Nickel center and ground electrode tip materials
• 5000 ohm resistance for ignition system compatibility
• Flat seat, 10.00 mm thread diameter, and .75 reach
• 5/8 hex size with non-removable nut terminal
• Pre-gapped at .028 with two ground electrodes

Detailed Description

Built under NGK’s Standard Spark Plug line, the CR8EKB is engineered for applications that require a conventional spark plug with OE-style dimensions and materials. NGK has long supplied original equipment spark plugs for domestic and import vehicles in North America, and that manufacturing background is reflected in the plug’s practical design and material selection. For buyers searching for NGK CR8EKB 4374 spark plug replacement, this part provides the core specifications needed to match the application correctly.

This spark plug is commonly searched for by riders and technicians looking for a replacement spark plug for motorcycle ignition service, as well as other engine platforms that specify the same thread, reach, seat type, and heat range. If you are comparing NGK 4374 spark plug options for a Honda or other make/model application, verify the required dimensions and terminal style before installation.

This part cross-references AMS Automotive 4374 for the same application.

Common Issues It May Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from inconsistent ignition output
• Misfire conditions related to electrode wear
• Poor throttle response from degraded spark delivery
• Maintenance replacement for specified NGK CR8EKB applications

Installation Notes and Tips

Confirm the required heat range, thread diameter, reach, seat type, and terminal style before installation. Check the plug gap against the engine specification, even though this plug is pre-gapped at .028, and inspect the ignition system for wear or contamination that could affect performance. Use the correct torque procedure for the engine and avoid cross-threading the 10.00 mm threads.

For fitment-based searches, this NGK spark plug is used in specific applications such as Fits 2006-2011 Honda Civic, front right only when the vehicle and engine call for the listed plug specifications; always match the OE requirement to the part number 4374 and CR8EKB designation.

Quality Assurance

NGK is a major OE spark plug supplier with extensive North American manufacturing and distribution support. The CR8EKB 4374 is produced to meet original-equipment-style standards for durability and consistent ignition performance across specified applications.