Moroso High Performance Ultra 40 Ignition Wire - 40/SET `18-UP Softail Models — Harley-Davidson (2018-2020)

Moroso High Performance Ultra 40 ignition wire set for 2018-up Harley Softail models, featuring 8.65mm diameter construction with 40 ohms-per-foot resistance and DuPont Kevlar core. Fully compatible with Harley's ION sense ignition coils and engineered to handle high heat and vibration on modern Milwaukee-Eight engines.

Features

• 8.65mm diameter with 40 ohms per foot resistance
• DuPont Kevlar core — four times stronger than standard Aramid
• Nickel copper alloy conductors for superior spark energy transfer
• High-temperature silicone boots rated to 600°F
• Locking stainless steel plug terminals stay connected under vibration
• Extra-thick EPDM dielectric layer
• 100% compatible with Harley ION sense ignition coils
• Made in the USA

Specifications

• Brand: Moroso
• Manufacturer Part #: 28644
• UPC: 84663286445
• Wire Diameter: 8.65mm
• Resistance: 40 ohms per foot
• Set Quantity: 40 wires
• Length: 14 in
• Weight: 1 lbs

Fitment

Fits Harley-Davidson Softail models 2018 and newer with Milwaukee-Eight engines and ION sense ignition systems.

Frequently Asked Questions

Will these fit my 2018+ Softail with factory ignition coils?

Yes — these wires are 100% compatible with Harley's ION sense ignition coils found on all 2018-up Softail models.

What's the advantage of 40 ohms per foot resistance?

Lower resistance (40 ohms) delivers more spark energy to the plugs for better combustion, improved throttle response, and easier cold starts compared with stock wires.

Can I use these on a Twin Cam or older Harley?

These are engineered for 2018-up Softail with ION sense coils. Check fitment for other model years and powertrains.

Do the silicone boots really handle 600°F?

Yes — the high-temperature silicone formulation resists cracking and insulation breakdown at sustained engine temperatures, extending wire life significantly.

Is this a full 40-wire set, or do I need to buy more?

This is a complete 40-wire set for one motorcycle. Quantity covers all ignition circuits on a single Softail.