Accel High Performance Copper Core Spark Plug - Plugs TC/XL High Performance — Harley-Davidson (1955-2026)

Accel high-performance copper core spark plug engineered for V-twin motorcycles, featuring the C-Cut design that creates a hotter, faster-expanding spark for more complete combustion. Delivers improved throttle response, fuel efficiency, and reduced emissions without increasing spark gap.

Features

• ACCEL C-Cut copper core design
• Hotter spark with faster flame expansion
• Spark positioned above electrode midpoint to avoid ground strap shrouding
• Larger spark nucleus without increased gap
• More complete air-fuel burn
• Improved throttle response and fuel economy

Specifications

• Brand: Accel
• Manufacturer Part #: 2418
• UPC: 743047801673
• Type: Copper core spark plug
• Length: 2.15 in
• Weight: 0.21 lbs
• Country of Origin: Japan

Fitment

Fits V-twin motorcycles, including Harley-Davidson and Indian Motorcycle models.

Frequently Asked Questions

What makes the ACCEL C-Cut different from a standard spark plug?

The C-Cut positions the spark above the electrode core, preventing the ground strap from blocking the flame and creating a larger, hotter spark nucleus for better combustion.

Will this improve my bike's performance?

Yes — the larger flame front burns fuel more completely, resulting in improved throttle response, fuel efficiency, and reduced emissions.

Do I need to adjust my spark gap?

No — the C-Cut design produces a larger spark nucleus without requiring an increased gap.

Will this fit my Harley or Indian?

This plug fits most V-twin motorcycles including Harley-Davidson and Indian models. Verify your bike's original plug type before ordering to confirm fitment.

What country are these made in?

Manufactured in Japan.