NGK 5984 Spark Plug

NGK Spark Plug 5984 Overview

NGK spark plug 5984 is a standard replacement spark plug built for a wide range of snowmobile and powersports applications. It uses a copper core center electrode, nickel tip materials, and a 5,000 ohm resistor for stable ignition performance.

Compatible With Polaris, Ski-Doo, Arctic Cat, and Yamaha applications, this spark plug is specified across many models with different gap requirements. The NGK 5984 part number is also listed as BR9ES SOLID S25.

Key Features

• Copper core center electrode for consistent heat transfer.
• Nickel center and ground electrode tip materials.
• 5,000 ohm resistor for reduced electrical noise.
• Standard ground electrode design with a flat seat.
• 14 mm thread diameter, 0.75 in reach, and 13/16 in hex size.
• Pre-gapped specification and non-removable nut terminal.

Detailed Description

NGK 5984 is a conventional spark plug designed around OE-style construction and broad application coverage. The plug’s copper core and nickel electrode materials support reliable spark delivery, while the standard ground configuration and flat seat match common factory-style ignition requirements. This part number, 5984, is used across many Polaris, Ski-Doo, and Yamaha models, including fitments that call for specific gap settings such as 0.016 in, 0.020 in, 0.024 in, 0.025 in, 0.028 in, and 0.032 in.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Is Used For

• Hard starting caused by worn or fouled spark plugs.
• Misfire conditions from weak or inconsistent spark output.
• Ignition performance loss from electrode wear.
• Maintenance replacement for factory-style spark plug service.
• Restoring proper combustion in compatible powersports engines.

Installation Notes and Tips

Verify the required gap for the specific application before installation, since listed fitments use different gap specifications. Confirm thread diameter, reach, seat type, and terminal style match the original plug. Use the vehicle service information for final torque and gap verification.

Quality Assurance

NGK is a major OE spark plug supplier in North America with more than 80 years of automotive experience. The brand manufactures to original equipment standards and supports a broad range of automotive and powersports ignition applications.