NGK 6899 Spark Plug

NGK 6899 Spark Plug Overview

NGK 6899 is a standard spark plug built to OE specifications for a wide range of Honda and Suzuki applications. It uses a copper core center electrode, nickel electrode materials, and a 0.036-inch pre-gap for consistent ignition performance.

Key Features

• Standard spark plug design with a flat seat and stud terminal
• Copper core center electrode for stable heat transfer
• Nickel center and ground electrode tip materials
• 0.036-inch pre-gap and 5,000 ohm resistance
• 10 mm thread diameter, 0.75 reach, and 5/8 hex size

Detailed Description

This NGK spark plug, part number 6899, is engineered for direct OE-style service in small-displacement motorcycles and powersports engines. The CPR6EA-9 design combines a standard ground configuration with a copper core center electrode and nickel tip materials to support reliable spark delivery and combustion consistency. It fits applications such as the Honda CRF125F, Honda Grom 125, and Suzuki C90 Boulevard, making it a practical replacement when maintaining factory-style ignition performance matters. The part number 6899 is also identified by the NGK stock number 6899.

NGK’s Standard Spark Plug line reflects the brand’s long OE manufacturing background and focus on original equipment standards. For buyers searching for an NGK 6899 spark plug or CPR6EA-9 replacement, this part provides the core specifications needed for correct service selection.

What It Is Used For

• Restoring weak or inconsistent spark output
• Replacing worn electrodes that affect starting quality
• Addressing misfire concerns tied to plug wear or gap drift
• Maintaining factory-style ignition performance in compatible Honda and Suzuki models
• Supporting smoother combustion in small-engine motorcycle applications

Installation Notes and Tips

Verify the thread diameter, reach, seat type, and heat range before installation. The OE specification calls for a 0.036-inch gap on listed applications, so confirm gap settings during service. Use the correct torque procedure for the cylinder head material and inspect the ignition system if the old plug shows unusual fouling or wear.

Quality Assurance

NGK is a major OE spark plug supplier in North America and manufactures to original equipment standards. This part cross-references DENSO Auto Parts (e.g., 4228) for the same application.