NGK SPARK PLUGS BPR5ES-11 7634 Spark Plug 10 PACK

OVERVIEW

The NGK BPR5ES-11 spark plug delivers consistent ignition performance and reliable engine starting for V-twin motorcycles. Built with high alumina ceramics and a deep-seated copper core, this plug maintains optimal thermal control across diverse riding conditions. It serves as a direct replacement for stock ignition components in numerous Harley-Davidson machines.

ENGINEERING & PERFORMANCE

This component provides stable firing characteristics across wide operating heat ranges, minimizing carbon buildup and preventing preignition during heavy load or cool-idle operation. The ceramic insulator and copper core work together to dissipate excess heat efficiently while expanding the effective tuning window. A precision nickel alloy center electrode extends service intervals and maintains spark intensity over time. Designed for direct installation, the plug restores factory-level compression sealing and ignition timing without modifying existing wiring or engine management systems.

KEY FEATURES

• NGK premium copper-core spark plug design
• High alumina ceramic insulator for superior heat dissipation and electrical insulation
• Deep-seated copper core expands operative heat range
• Nickel alloy tip construction increases electrode longevity
• Wide operating temperature control resists fouling and preignition
• Straightforward bolt-on replacement for affected Harley-Davidson models
• Versatile geometry to match varying cylinder head thread depths
• Supplied in a 10-pack for scheduled maintenance efficiency

TECHNICAL SPECIFICATIONS

• Brand: NGK
• Part Name: BPR5ES-11 Spark Plug (P/N 7634)
• Component Type: Spark Plug
• Material Construction: High alumina ceramics, deep-seated copper core, nickel alloy tip
• Supported Years: 1984–2000
• Compatible Trims: Electra Glide, Softail, Dyna, Road King, Tour Glide, and Legacy Sport models

FITMENT

• Honda – Not applicable; vehicle platform mismatch confirmed
• Yamaha – Not applicable; vehicle platform mismatch confirmed
• Polaris – Not applicable; vehicle platform mismatch confirmed
• Ducati – Not applicable; vehicle platform mismatch confirmed
• Kawasaki – Not applicable; vehicle platform mismatch confirmed
• Harley-Davidson Electra Glide Ultra Classic (1985–1998)
• Harley-Davidson Electra Glide Classic (1984–1998)
• Harley-Davidson Electra Glide Classic EFI (1995–1998)
• Harley-Davidson Electra Glide Standard (1985–1998)
• Harley-Davidson Electra Glide Sport (1987–1993)
• Harley-Davidson Tour Glide Ultra Classic (1989–1998)
• Harley-Davidson Tour Glide Classic (1985–1993)
• Harley-Davidson ROAD KING (1994–1998)
• Harley-Davidson Road King Classic EFI (1998)
• Harley-Davidson Road Glide (1997–1998)
• Harley-Davidson Softail Heritage Classic (1991–1999)
• Harley-Davidson Softail Custom (1986–1999)
• Harley-Davidson Softail Springer (1988–1999)
• Harley-Davidson Softail Fat Boy (1990–1999)
• Harley-Davidson Softail Standard (1984–1992)
• Harley-Davidson Softail Bad Boy (1995–1997)
• Harley-Davidson Softail Heritage Special (1993–1995)
• Harley-Davidson Softail Heritage (1986–1990)
• Harley-Davidson Dyna Convertible (1995–1998)
• Harley-Davidson Dyna Daytona (1992)
• Harley-Davidson Dyna Glide Custom (1992)
• Harley-Davidson Low Rider (1985–1998)
• Harley-Davidson Low Rider Custom (1987–1994)
• Harley-Davidson Low Rider Sport (1988–1993)
• Harley-Davidson Low Rider Convertible (1990–1993)
• Harley-Davidson Wide Glide (1993–1996)
• Harley-Davidson Super Glide (1995–1998)
• Harley-Davidson Night Train (1999)
• Harley-Davidson Heritage Springer (1997–1999)
• Harley-Davidson Street Bike (1985–1993)
• Harley-Davidson Grand Touring (1986)
• Harley-Davidson Disc Glide (1984)
• Harley-Davidson Low Glide Custom (1985)
• Harley-Davidson Low Glide (1984–1985)
• Harley-Davidson Fat Bob (1985)

WHY RIDERS CHOOSE THIS

Riders select this spark plug because the copper-core construction and broad heat tolerance adapt reliably to both highway cruising and aggressive low-speed maneuvering. The ceramic insulator and nickel alloy tip maintain a crisp spark even when cylinder heads run cooler than newer emission-controlled engines expect. Consistent firing eliminates hesitation during throttle transitions and reduces the frequency of replacements during extended trail runs. Installed directly without adapters or retiming, it restores proper combustion efficiency and keeps the ignition system secure across generations of flat-twin powerplants.