NGK 4522 Spark Plug BR9HS Pack of 10

OVERVIEW

The NGK BR9HS spark plug delivers consistent ignition energy and stable combustion control for performance-oriented two-stroke and four-stroke engines. Constructed with a rugged high-alumina ceramic insulator, a deep-seated copper thermal core, and a hardened nickel-alloy electrode tip, this plug is engineered to maintain reliable operation under extreme thermal stress. Designed specifically for classic motorcycles, dirt bikes, and vintage snowmobiles from the 1960s through 2000, the BR9HS provides a direct replacement path for riders who demand predictable throttle response and sustained engine longevity.

ENGINEERING & PERFORMANCE

Operating within a broad heat range, the BR9HS resists carbon fouling during prolonged low-speed riding while preventing preignition when running under heavy load or high ambient temperatures. The integrated aluminum oxide ceramic body efficiently channels excess heat away from the firing end, maintaining optimal core nose temperatures across varying environmental conditions. A deep-seated copper core further widens the thermal acceptance window, ensuring quick warm-up times and stable vaporization. Combined with a precision-formed nickel alloy tip, the plug sustains voltage integrity over thousands of firing cycles for dependable cycle-to-cycle operation.

KEY FEATURES

• High-alumina ceramic insulator for enhanced electrical resistance and thermal management
• Deep-seated copper core engineered to widen practical operating heat range
• Nickel alloy center electrode tip designed for extended service intervals
• Broad heat tolerance prevents fouling in cool-running conditions and curbs preignition at high loads
• Superior internal construction supports consistent power delivery under aggressive throttle inputs
• Packaged as a set of 10 plug units for fleet, workshop, or bulk retention use
• Direct OEM-equivalent thread reach and gasket seat dimensions for precise installation

TECHNICAL SPECIFICATIONS

• Brand: NGK
• Part Name: BR9HS Spark Plug (NGK #4522)
• Component Type: Spark Plug
• Material: High-alumina ceramic insulator, deep-seated copper core, nickel-alloy tip
• Supported Years: 1967–2000
• Compatible Trims: Kawasaki KX, KH, H-series, S-series, F-series, A-series, KD; Ski-Doo Everest, Citation, Olympique/Olympic, TNT; Moto-Ski Nuvik; Cobra CM50

FITMENT

• 1997–2000 Cobra CM50
• 1978–1979 Moto-Ski Nuvik
• 1978–1979 Ski-Doo Everest 340
• 1978–1979 Ski-Doo Everest 340E
• 1978 Ski-Doo Citation 300
• 1978 Ski-Doo Olympique 300T
• 1978 Ski-Doo Olympic 340
• 1976–1979 Kawasaki KD175
• 1976 Kawasaki KH250
• 1976 Kawasaki KH500
• 1974 Kawasaki KX450
• 1973–1975 Kawasaki F11
• 1973 Kawasaki S1 Mach I
• 1973 Ski-Doo TNT 340 w/Slides
• 1972–1975 Kawasaki H1 Mach III
• 1972–1975 Kawasaki H2 Mach IV
• 1972–1973 Kawasaki S2 Mach II
• 1971–1975 Kawasaki F7
• 1970–1971 Kawasaki G31M
• 1967–1968 Kawasaki A7SS
• 1967–1968 Kawasaki A7 Avenger

WHY RIDERS CHOOSE THIS

Riders select the NGK BR9HS because it reliably bridges the gap between cold-idle stability and full-throttle heat, eliminating the constant cleaning cycles that plague single-cylinder trail machines and vintage sleds. The robust ceramic insulator combined with the copper core ensures the plug fires precisely regardless of fuel mixture deviations or altitude shifts, which translates directly to smoother acceleration and fewer stall-outs out on the snow or trail. Its extended electrode lifespan reduces downtime in remote riding areas where troubleshooting electrical gremlins is impractical. For owners of older Kawasakis, Ski-Doos, and Cobra models, this plug restores factory-grade ignition timing characteristics without requiring aftermarket tuning adjustments.