NGK 6607 Spark Plug

NGK CPR8EB-9 Spark Plug Overview

NGK 6607 is a standard spark plug built for dependable ignition performance in a wide range of domestic and import applications. This NGK spark plug uses a copper center electrode core, nickel center electrode tip, and nickel ground electrode materials to support consistent spark delivery and stable combustion.

As part of the NGK Standard Spark Plug line, this plug reflects NGK’s long OE supply background and focus on original-equipment-style durability for everyday driving. The CPR8EB-9 configuration is a practical choice for drivers searching for an NGK 6607 spark plug, NGK CPR8EB-9 replacement, or a standard spark plug for Honda motorcycle and small-engine applications where the specified heat range and gap matter.

Key Features

• NGK part number 6607, also identified as CPR8EB-9
• Standard spark plug design with a flat seat
• Copper center electrode core for reliable conductivity
• Nickel center and ground electrode tip materials
• 5,000 ohm resistance for ignition system noise control
• Pre-gapped at .036 inch
• 10 mm thread diameter, .75 inch reach, 5/8 hex size
• Single ground electrode with standard configuration

Product Details

NGK 6607 is engineered as a conventional replacement spark plug for applications that call for the CPR8EB-9 specification. The 8 heat range, flat seat, and non-removable nut terminal help match the original plug requirements in engines that depend on precise ignition timing and correct plug geometry. For shoppers comparing NGK 6607, CPR8EB-9, and related OE-style spark plugs, this part is built around the core dimensions and electrode materials commonly specified by manufacturers.

This part cross-references AMS Automotive 6607 for the same application. It is also searched by drivers looking for Honda motorcycle spark plug replacement and small engine ignition service parts, including Honda model-specific maintenance needs where the OEM plug number is CPR8EB-9.

Common Issues This Plug Can Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire symptoms tied to incorrect plug gap or worn electrodes
• Reduced throttle response from degraded ignition performance
• Maintenance replacement for specified Honda motorcycle and small-engine applications

Installation Notes and Tips

Verify the engine calls for NGK CPR8EB-9 or NGK 6607 before installation. Confirm thread diameter, reach, seat type, and pre-gap against the service specification, especially on Honda motorcycle and small-engine applications where plug fitment is exact. Use the correct torque procedure for the cylinder head material and inspect the ignition lead or coil terminal connection before final assembly.

Quality Assurance

NGK is a long-standing OE spark plug supplier with broad coverage across domestic and import vehicles, motorcycles, marine engines, and small engines. The Standard Spark Plug line is built to original-equipment standards for durability and consistent operation.