NGK 6957 Spark Plug

NGK Iridium IX Spark Plug 6957 Overview

NGK Iridium IX Spark Plug 6957 is built for drivers who want precise ignition performance and dependable service life from a premium spark plug. This NGK spark plug uses an iridium center electrode, a copper core, and a tapered-cut ground electrode to support consistent firing in demanding engine conditions.

Part number 6957 is part of NGK’s Iridium IX Spark Plug line, a product family focused on fine-wire iridium technology and OE-level manufacturing standards. For shoppers searching for NGK 6957 spark plug replacement, BR10EIX SOLID cross reference, or an iridium spark plug for motorcycle, marine, or small engine applications, this part delivers a technical fit for ignition service work.

Key Features

• Iridium center electrode tip material for stable spark delivery
• Copper center electrode core for efficient heat transfer
• Taper-cut ground electrode tip design
• Standard ground configuration with one ground electrode
• 5000 ohm resistance
• Pre-gapped to .032 for installation consistency
• 14.00 mm thread diameter, .75 reach, and flat seat design
• 13/16 hex size with non-removable nut terminal

Detailed Product Description

NGK 6957 is an Iridium IX spark plug engineered around a 10 heat range and a nickel ground electrode core. The iridium tip supports reliable ignition performance, while the copper core helps manage heat under operating load. These specifications make it a strong choice for maintenance on engines that call for a 14 mm, flat-seat spark plug with a .032 pre-gap.

NGK’s long OE manufacturing background shows in the consistency of this plug’s construction and application coverage. This part cross-references DENSO Auto Parts 5319 for the same application. If you are servicing a motorcycle, marine engine, or small engine that specifies NGK 6957, this spark plug supports direct replacement needs with the correct thread, reach, and terminal style.

What This Spark Plug Helps Address

• Hard starting caused by worn or fouled spark plugs
• Misfire conditions from weak or inconsistent spark output
• Rough idle related to degraded ignition performance
• Reduced throttle response from aging plug electrodes
• Maintenance intervals where the original spark plug has reached service limit

Installation Notes and Tips

Verify the engine calls for a 14.00 mm thread diameter, .75 reach, flat seat, and 13/16 hex before installation. Confirm the specified heat range and gap requirement against the service manual, then inspect the plug wire or coil terminal for wear before fitting NGK 6957. For vehicle searches, use terms such as NGK 6957 spark plug, BR10EIX SOLID replacement, and iridium spark plug for motorcycle or marine engine service.

Compatible With select applications across motorcycle, marine, and small engine platforms where NGK 6957 is specified. For make/model searches, include the exact vehicle or engine family along with part number 6957 to narrow results accurately.

Quality Assurance

NGK is a major OE spark plug supplier in North America and manufactures ignition components to original equipment standards. Its North American and global production and distribution network supports consistent product availability and quality control for replacement ignition service.