NGK Spark Plug Set CPR7EA-9 (3901) 2-Pack — Nickel/Copper OEM-Quality, .036" Pre-Gap

NGK CPR7EA-9 (3901) is a two-piece set of OEM-quality nickel/copper spark plugs designed as direct replacement plugs for select Kawasaki, Suzuki, Yamaha and other engines that require a 0.036 in gap and 5/8" hex.

These NGK spark plugs deliver the standard-replacement performance expected from a global OE supplier, built with a copper core and nickel-alloy tip, ceramic insulator, and a 5,000-ohm resistor to reduce electrical interference. The CPR7EA-9 has a 0.750 in reach, 10.0 mm thread diameter, and a .036 in (0.9 mm) pre-gap, making it suitable for many ATVs, UTVs and motorcycles listed in the fitment below. This listing includes two spark plugs packaged in NGK’s recognizable yellow box; always confirm compatibility with your vehicle’s service manual or manufacturer before installing.

What are the key construction details of the CPR7EA-9?

The CPR7EA-9 combines a solid copper core for heat dissipation with a nickel-alloy center tip and a nickel ground electrode. A high-grade alumina-silicate ceramic insulator and triple gasket sealing improve dielectric strength and prevent combustion leakage, while trivalent metal plating helps resist corrosion and seizure.

• Material grade: nickel/copper with 98% pure copper core
• Resistor: 5000 ohms to suppress electrical interference
• Insulator: high-grade ceramic with triple gasket sealing
• Washer: crush-type for secure flat-seat sealing

Which vehicles is this NGK plug compatible with?

This CPR7EA-9 set fits a range of models from Kawasaki, Suzuki and Yamaha among others where the OEM spec calls for a nickel-type plug with 0.036 in gap and 10 mm threads. Popular compatible machines include Kawasaki KRF800/Teryx and KRT800 series, KVF750 Brute Force variants, Yamaha XVS950 Bolt models, and certain Suzuki GSX250R years. Always verify year, engine displacement, and factory part numbers for an exact match.

• Kawasaki KRF800/Teryx and KRT800 Teryx4 models 2014–2024 (783cc)
• Kawasaki KVF750 Brute Force models 2015–2024 (749cc)
• Yamaha XVS950 Bolt and V Star 950 variants 2009–2019 (942cc)
• Suzuki GSX250R 2018–2019 (248cc)

How does installation and maintenance look for these plugs?

Installation follows standard spark plug procedures: verify thread size, reach, and seat type (flat seat for this plug), apply the recommended torque, and use the crush washer for proper sealing. The CPR7EA-9 arrives pre-gapped to .036 in; check and adjust gap if required by your service manual before installation.

• Hex size: 5/8" (16 mm) for standard spark plug socket
• Reach: 0.750 in (19.0 mm) — confirm clearance in your cylinder head
• Pre-gap: .036 in (0.9 mm) — recheck with a feeler gauge
• Thread diameter: 0.394 in (10.0 mm) — ensure matching thread

Why choose NGK standard nickel plugs over other options?

NGK’s standard nickel spark plugs are engineered as OE-style replacements where nickel alloy plugs are specified from the factory. They provide dependable conductivity and heat control due to the copper core and broad heat range, and are especially practical for engines originally equipped with nickel-type electrodes rather than precious-metal tips.

• OE-focused design for reliable, cost-effective replacement
• Wide heat range and strong thermal transfer from copper core
• Durable plating and gasket sealing for longer service life

Who is this for? If you own an ATV, UTV or motorcycle in the models listed and need a cost-effective OEM-style replacement spark plug that matches factory nickel-alloy specifications, the NGK CPR7EA-9 two-pack is a practical choice. It’s aimed at riders and technicians who prefer proven OE fit and function: check vehicle fitment, replace plugs per scheduled maintenance, and use proper torque and gap verification during installation.

Note: This product listing is for two NGK CPR7EA-9 (3901) nickel spark plugs. Fitment references are provided for guidance; always verify compatibility against your vehicle’s manufacturer specifications.