Accel S/PLUGS; BT75-99 PLATINUM

The ACCEL Platinum Spark Plugs are engineered for long-lasting performance and reliability, designed specifically for Big Twin motorcycles (1975–1999) with electronic ignition and Sportster Evolution models (1986–later). Featuring a premium platinum tip and copper center electrode, these plugs deliver superior spark efficiency, easier starts, improved fuel economy, smoother idling, and quicker acceleration. Sold in a convenient 24-pack for extended use.

Features & Benefits

• Platinum Tip Center Electrode – Bonded to a massive copper core for superior conductivity and consistent spark.

• U-Groove Ground Electrode – Develops a larger spark for more complete combustion.

• Insulator & Five Rib Construction – Made from highly purified alumina powder for strength and thermal conductivity.

• Copper-Glass Seal – Gas-tight seal ensures long-term reliability.

• Electric Heat Seal – Maintains a stable heat range for optimal performance.

• Machine Rolled Threads – Ensures trouble-free installation and removal.

• Durable Design – Platinum tip maintains gap longer than standard plugs, reducing misfires.

Fitment

• Big Twin motorcycles (1975–1999) with electronic ignition

• Twin Cam models (all, 1999-later)

• Sportster Evolution models (all, 1986-later)

Technical Details

• Manufacturer Part Number: 2418P

• Replaces HD Code # 6R12

• Replaces HD # 32317-86A

• Spark Gap: 0.040"

• Weight: 2.43