NGK SPARK PLUGS BR8ES 5422 10 PACK

OVERVIEW

The NGK BR8ES spark plug delivers reliable ignition for demanding two-stroke and four-stroke engines, directly replacing worn OEM units while maintaining factory spark gap specifications.

Built with high-alumina ceramic insulation, a deep-seated copper core, and a wear-resistant nickel alloy center electrode, it handles extreme operating temperatures without breaking down. This design ensures stable electrical distribution across dirt bikes, utility vehicles, and trail sleds.

ENGINEERING & PERFORMANCE

Wide operating heat ranges prevent coil fouling during low-speed operations while guarding against destructive preignition under full throttle loads.

The embedded copper core actively channels heat away from the ignition point, significantly extending service intervals compared to standard carbon-based designs.

Factory-spec threading and resistance profiles allow for seamless direct replacement, while fully sealed ceramic bodies maintain strong voltage retention despite constant impact and moisture exposure.

KEY FEATURES

• NGK BR8ES direct-fit replacement spark plug
• High-grade alumina ceramic insulator for maximum dielectric strength
• Deep-sit copper core widens functional temperature tolerance
• Nickel alloy center electrode resists thermal erosion
• Engineered burn profile minimizes carbon and oil fouling
• Consistent spark delivery under vibration and heavy exhaust pulse
• Drop-in installation requires zero coil or wiring modifications
• Covers thousands of configurations across multiple vintage manufacturers

TECHNICAL SPECIFICATIONS

• Brand: NGK
• Part Name: BR8ES Spark Plug (Pack #5422)
• Component Type: Ignition spark plug
• Material: High-alumina ceramic, copper core, nickel alloy tip
• Supported Years: 1981–2014
• Compatible Trims: Select Sherco, Beta, Polaris, Yamaha, Sea-Doo, Kawasaki, Arctic Cat, Aprilia, KTM, and Ski-Doo platform variants

FITMENT

• Sherco 250 SE-R / 300 SE-R (2012–2014)
• Beta Evo 80 Junior / 250 RR (2008–2012)
• Polaris Indy 340 / 440 / 500 / 600 (1991–2014)
• Polaris Sportsman 350 / 400 / Trail Boss (1991–2006)
• Polaris Classic / LITE / Star / Trail Blazer (1986–2006)
• Sea-Doo GTX / GTS / GSX / SPX / XP / HX / GSi (1995–2001)
• Yamaha XA WaveRunner XL / XLT / GP / RD / IT (1983–2002)
• Kawasaki JT / JH / JS STX / Xi / Sport Tourer / SX (1993–2004)
• Arctic Cat Jag 340 / 440 Deluxe (1987–1990)
• Aprilia RS 50 / 125 (1997–2005)
• KTM 125 Sting (1998)
• Ski-Doo Skandic 377 (1982–1984)

WHY RIDERS CHOOSE THIS

Riders gravitate toward the NGK BR8ES because its broad thermal window resolves mixture tuning issues across changing trail conditions and elevation gains.

The conductive copper matrix rapidly dissipates concentrated cylinder head heat, slowing deposit formation and preserving crisp throttle response mile after mile.

Plug-and-play OEM dimensions eliminate guesswork during maintenance windows, ensuring instant cranking and reliable power delivery without aftermarket adjustments.

That blend of proven metallurgy and precise mechanical fitment keeps older trail machines and watercraft running reliably, making it a practical choice for daily rotation or long-term restoration projects.