NGK DPR6EA-9 Spark Plug 4-Pack – Nickel/Copper, 0.036 in Gap, 6 Heat, 12 mm Thread

Meet the NGK DPR6EA-9 4-pack spark plugs, designed to deliver dependable ignition on a range of riders who value steady performance across daily rides and weekend getaways. Built to mirror OE concepts with modern materials, these plugs offer a balanced approach to ignition reliability without overpromising results.

Why riders choose NGK for their V-twin and cruiser engines

These plugs combine a nickel/copper center electrode with a solid copper core, supporting efficient heat transfer and consistent operation in varied riding conditions. A high-grade ceramic insulator provides robust dielectric strength, helping maintain stable ignition under demanding temperatures. The triple gasket seal helps reduce gas leakage and preserve compression, contributing to predictable idle and smooth acceleration.

• Pre-gap is set at .036 in (0.9 mm) for consistent performance out of the box.
• Ground electrode configuration features a standard J-gap with one electrode for reliable spark delivery.
• Resistor type helps suppress ignition noise and supports electrical stability in the ignition system.
• Solid copper core and nickel alloy materials are chosen for heat dissipation and durability.

This 4-pack is labeled as a standard replacement option, aligning with many OEM nickel alloy plug applications. It is not a guarantee for every engine, so it’s wise to verify the part number and gap against your owner’s manual or NGK directly before purchasing.

Key specifications at a glance

• Part number: DPR6EA-9; 4 plugs per pack; Stock: 5531
• Thread diameter: 12.0 mm (0.472 in); Hex size: 18 mm
• Reach: 19.0 mm (0.750 in); Ground electrode: 1; Gap: 0.036 in
• Ground electrode tip design: Standard; Resistor type: Yes; Washer: Crush

Compatibility spans several Kawasaki Vulcan 1500 models and Triumph Thunderbird series from the 2010s, among other OE nickel alloy plug applications. Always confirm compatibility with the vehicle manual or NGK to ensure the part matches your engine’s specifications and heat range.

Practical notes for installation and use

When installing, handle with care to avoid damage to the ceramic insulator. Use the correct torque specification and ensure the gasket seals properly to maintain compression and prevent leaks. Real-world riding benefits may include steady idle, reliable cold starts, and consistent power delivery under varied loads.