Sumax Parts & Accessories

Sumax build spark plug wires properly — Spiro-Pro 8mm sets in two-layer all-silicone construction, rated to 600°F, and they stay flexible in cold weather where cheaper wires go stiff. Eleven colours plus vintage braided cloth styles for the period-correct crowd, and ThunderVolt sets at 40 ohms total resistance for maximum spark energy.

Compatible with both points and electronic ignition across all Harley platforms. A real upgrade if your current leads are old, cracking, or carrying voltage drop you can feel in the way the bike runs at the top of the rev range.