NGK CPR7EA-9 Spark Plug Set — 2-Pack Nickel/Copper Resistor Plugs, 0.9mm Gap, 5/8" Hex

NGK CPR7EA-9 (stock 3901) is a two-piece set of nickel/copper, resistor spark plugs engineered as direct OE-style replacements for many Kawasaki, Yamaha, Suzuki and other small-displacement engines.

These NGK standard replacement spark plugs combine a copper core with a nickel alloy tip and a high-grade ceramic insulator to deliver consistent ignition performance across a wide range of recreational vehicles and motorcycles. Designed with a 0.036 in (0.9 mm) pre-set gap, a 5,000-ohm resistor and a 7 heat range, the CPR7EA-9 is intended as a like-for-like replacement where OEM nickel plugs are specified. The plug includes a crush washer and a 5/8" (16 mm) hex for straightforward installation.

Which vehicles and engines commonly use the CPR7EA-9?

The CPR7EA-9 fits a variety of ATVs, UTVs and motorcycles that originally shipped with nickel alloy plugs. Compatibility covers multiple model years for Kawasaki Teryx and Brute Force, several Yamaha V Star/XVS950 variants and select Suzuki GSX250R models. Always cross-check the part number against your owner’s manual or the original equipment reference before ordering.

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

How is the CPR7EA-9 built and what are its technical specs?

This plug features a solid copper core for heat control and a nickel alloy center and ground electrode. It uses a ceramic alumina-silicate insulator for superior dielectric strength, a J-gap ground configuration and a mid-projection center electrode design. The plug is a resistor type with a specified resistance of 5,000 ohms to reduce radio-frequency interference.

• Pre-gapped to 0.036 in (0.9 mm) with a center projection of 0.12 in (3.0 mm)
• Thread: 0.394 in (10.0 mm) diameter, reach 0.750 in (19.0 mm)
• Hex size: 5/8" (16 mm); insulator height: 1.92 in (48.8 mm)
• Materials: copper core, nickel electrode tip, ceramic insulator; resistor included

What installation and maintenance points should I know?

Installation is straightforward using a 5/8" socket; the included crush washer provides a proper seal when torqued to manufacturer specifications. Because these are nickel-alloy plugs, they’re intended as replacements for vehicles that shipped with nickel plugs—not for engines designed around precious-metal electrodes. Inspect gap and torque during installation and replace in matched intervals recommended by your vehicle maker.

• Use 5/8" socket and torque per vehicle manual; replace crush washer each install
• Verify 0.036 in gap after installation and re-gap only if necessary
• Recommended for engines originally equipped with nickel alloy plugs, not precious-metal types
• Check plug condition regularly for fouling, heat stress or electrode wear

Why choose NGK Standard nickel plugs instead of other aftermarket options?

NGK Standard plugs are engineered to meet OE fitment and performance expectations while providing economical replacement for nickel-equipped engines. The combination of copper core and high-grade ceramic helps manage heat and electrical flow reliably. Trivalent metal plating improves corrosion resistance and reduces the chance of seizing in the cylinder head threads.

• OE-quality design and materials tailored for nickel-plug applications
• Durable alumina-silicate insulator and triple gasket sealing for reliability
• Trivalent plating resists corrosion and thread seizure during service
• Cost-effective option for routine maintenance and scheduled plug replacement

Who is this for: The NGK CPR7EA-9 two-pack is intended for riders, DIY mechanics and service shops maintaining Kawasaki Teryx and Brute Force UTVs, Yamaha V Star/Bolt models, select Suzuki sportbikes and other small-displacement engines that specify nickel alloy replacement plugs. Choose this set when you need an OEM-style nickel plug with a copper core, resistor suppression and proven NGK manufacturing quality for routine tune-ups and service intervals.