Harddrive HD Performance Coils - 40v-HP Single Fire Coil Twin CAM Carb — Harley-Davidson (1999-2006)

Harddrive HD Performance 40V-HP single-fire coil for Twin Cam carbureted Harley-Davidson models, engineered to increase peak spark voltage by 20% or more. ION Sense feedback ensures compatibility with stock Harley EFI systems while improving cold starts, eliminating high-speed misfires, and boosting fuel economy.

Features

• High-power 30,000-volt output
• Increased peak spark voltage by 20% or more
• ION Sense feedback for stock EFI compatibility
• Dual Fire and Single Fire capable
• Improves cold starting and eliminates high-speed misfires

Specifications

• Brand: Harddrive
• Manufacturer Part #: 10-2001
• UPC: 191361439445
• Voltage Output: 40V-HP (30,000 volts)
• Dimensions: 5 in (L) × 3 in (W) × 4 in (H)
• Weight: 3 lbs
• Country of Origin: China (Mainland)

Fitment

Fits Twin Cam carbureted V-twin motorcycles. Compatible with stock Harley EFI ECU systems via ION Sense feedback.

Frequently Asked Questions

Will this coil work with my stock Harley ECU?

Yes — ION Sense feedback technology ensures full compatibility with stock Harley EFI electronics without requiring a separate tuner.

Does this improve fuel mileage?

Yes — improved spark performance typically increases overall mileage, along with stopping high-speed misfires.

Is this a single-fire or dual-fire coil?

This is a single-fire coil, but Harddrive also makes models compatible with both Dual Fire and Single Fire applications.

How much does peak spark voltage increase?

This 30,000-volt coil typically increases peak spark voltage by 20% or more compared to stock Twin Cam coils.

Will cold starting improve?

Yes — the higher spark voltage and ION Sense feedback combine to improve cold-weather starts and reduce cranking time.