Harddrive HD Performance 40V Single Fire Coil - Harley Twin Cam EFI
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
Unleash the full potential of your Twin Cam EFI Harley-Davidson with the Harddrive HD Performance 40V Single Fire Coil. Engineered to deliver a robust 30,000 volts, this coil significantly enhances ignition performance.
Why riders pick this
- Boosts peak spark voltage by 20% or more
- Delivers consistent 30,000-volt output
- ION Sense feedback for stock EFI compatibility
- Eliminates high-speed misfires and improves cold starts
- Supports both single-fire and dual-fire setups
This Harddrive HD Performance coil provides a substantial upgrade over stock, increasing peak spark voltage by 20% or more. The result is improved cold starts, smoother operation, and the elimination of high-speed misfires that can plague detuned factory bikes. Riders chasing every bit of usable power will feel the difference.
Enhanced Ignition for Peak Performance
- Delivers 30,000-volt high-power output for a stronger spark
- Increases peak spark voltage by 20% or more over stock
- ION Sense feedback ensures seamless compatibility with stock EFI ECUs
- Supports both single-fire and dual-fire applications
- Improves cold-weather starting and high-speed stability
Effortless Upgrade for Your Twin Cam
Designed for direct compatibility with your Harley's stock EFI system, this performance coil utilizes ION Sense feedback, meaning no additional tuning or modules are required for installation. It's a straightforward upgrade that provides immediate benefits to your engine's efficiency and power delivery, making it an ideal choice for riders looking to uncork their Twin Cam without complex modifications.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 10-2003
- UPC: 191361439452
- Voltage Output: 30,000 volts
- Dimensions: 5 in L × 3 in W × 4 in H
- Weight: 3 lbs
- Country of Origin: China (Mainland)
Common questions
Will this coil work with my stock Harley EFI system?
Yes, this coil is engineered with ION Sense feedback for direct compatibility with your stock Harley EFI ECU, requiring no additional tuning or modules.
What kind of performance improvements can I expect?
You can expect a 20% or more increase in peak spark voltage, leading to improved cold starts, elimination of high-speed misfires, and enhanced fuel economy.
Is this a bolt-on replacement for my factory coil?
Yes, this Harddrive HD Performance coil is designed as a direct replacement, supporting both single-fire and dual-fire applications on compatible Twin Cam EFI models.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Harddrive |
| TYPE | Electrical |
| SKU | 820-60409 |
| WEIGHT | 3.0 lb |
