Moroso High Performance Ultra 40 Ignition Wire - 40/SET RED 1978-1983 Universal — Harley-Davidson (1955-2026)

Moroso High Performance Ultra 40 ignition wire set delivers reliable spark across all cylinders with silicone jacket construction, locking stainless steel terminals, and a DuPont Kevlar core. Fully compatible with Harley-Davidson ION sensing coils on virtually all late-model bikes.

Features

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

Specifications

• Brand: Moroso
• Manufacturer Part #: 28621
• UPC: 84663286216
• Resistance: 40 ohms per foot
• Wire Diameter: 8.65mm
• Weight: 1.5 lbs
• Package Dimensions: 13.5 in L × 6.5 in W × 2.25 in H

Fitment

Fits Harley-Davidson models with ION sensing ignition coils, compatible with virtually all late-model Harley applications.

Frequently Asked Questions

Will these work with my Harley's ION ignition system?

Yes — 100% compatible with Harley-Davidson ION sense ignition coils on virtually all late-model bikes.

What's the resistance rating?

40 ohms per foot — class-leading suppression for clean spark and minimal electromagnetic interference.

Can these handle high heat?

Yes. Silicone boots are rated to withstand continuous heat up to 600°F, and the extra-thick EPDM layer provides additional dielectric protection.

What's included in a 40-piece set?

A complete set of 40 spark plug wires with locking stainless steel terminals and high-temperature silicone boots ready to install.

Are these made in the USA?

Yes — manufactured to Moroso's Made in the USA standards with DuPont Kevlar core construction.