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Keep your Mercury or Mariner outboard running smoothly with the Sierra 18-28085 ignition plug wire set. Designed as a direct replacement for worn-out factory wires, this set ensures consistent spark delivery, firing up your engine reliably even in harsh marine conditions. Boat owners know that faulty ignition wires can lead to frustrating misfires, rough idling, or complete no-starts—issues that this high-quality set helps prevent.
Replacing your ignition plug wires isn't just maintenance—it's an investment in your engine's reliability and performance. Fresh wires like the Sierra 18-28085 reduce energy loss between the coil and plugs, leading to stronger starts, smoother operation, and better fuel economy. Anglers, cruisers, and commercial operators alike report fewer breakdowns and extended spark plug life after installation. In the demanding marine environment, where exposure to water spray and humidity is constant, these wires outperform stock replacements by maintaining their integrity season after season.
The Sierra 18-28085 fits a wide range of Mercury and Mariner 4-stroke outboards. Consult the Sierra catalog or your engine's service manual to confirm exact fitment for models like popular 75-150 HP variants. It's engineered to meet or exceed OEM standards, ensuring seamless integration without modifications.
Most DIYers complete the job in under an hour with basic tools—no special equipment needed.
Inspect wires annually for cracks or wear, especially near boots. Keep engine compartments dry and apply dielectric grease to connections for extra protection against corrosion. Pair with fresh spark plugs for optimal results, and you'll notice crisper throttle response and quieter operation.
It fits various Mercury and Mariner 4-stroke outboards, particularly 75-150 HP models. Always cross-reference with the Sierra catalog for your specific engine.
Look for signs like hard starting, misfires, rough idling, or visible cracks on the wires. Reduced power or poor fuel economy can also indicate worn wires.
Yes, Sierra meets or exceeds OEM specifications with marine-grade materials, offering reliable performance at a better value.
Absolutely—it's a straightforward swap for most boat owners with basic mechanical skills. No special tools required.
The low-resistance core suppresses RFI, minimizing static on radios and electronics while improving spark quality.
Every 3-5 years or 300-500 hours of operation, depending on usage and exposure to marine conditions.
By ensuring efficient spark delivery, they promote better combustion, which can lead to modest gains in fuel economy.
Ships within 48 hours · Estimated delivery Jun 21 - Jun 26
US$40
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