Mercury – Quicksilver 821945A61 Black Spark Plug Wire Lead | Mercury & Mariner 30–300HP Outboards | 821945A61

Overview

Good spark equals good performance. The Quicksilver 821945A61 Black Spark Plug Wire Lead ensures your Mercury or Mariner outboard fires clean and strong every time. Designed for 30–300HP 2-stroke EFI, carbureted, and jet outboards — including 90–120HP JetDrive/SportJet models — this OEM lead delivers steady spark and lasting reliability, no matter how hard you run your motor.

Built with factory-grade materials and precise connections, this single spark plug wire includes a plug boot on one end and a coil boot on the other. It’s a quick, direct-fit replacement that keeps your ignition system working at its best.

Key Features

• Purpose: Replaces worn or damaged spark plug leads to restore consistent ignition and power delivery.
• Fitment: For Mercury and Mariner 30–300HP (2-, 3-, and 4-cylinder) 2-stroke EFI, carbureted, and jet outboards, plus 90–120HP JetDrive/SportJet engines.
• Design: Single wire lead with plug boot and coil boot pre-installed for easy replacement.
• Performance: Provides strong, clean spark transfer from the coil to the plug.
• Ease of Use: Installs quickly with basic hand tools.

Engine & Boat Compatibility

• Mercury and Mariner 30–300HP 2-stroke outboards
• Includes 90–120HP JetDrive and SportJet engines
• Common on fishing boats, sport boats, and jet-powered setups

Performance & Practical Benefits

The 821945A61 spark plug wire restores reliable ignition performance by ensuring steady voltage flow to each cylinder. Old or cracked wires can cause weak spark, misfires, or hard starts — this replacement brings your outboard’s ignition system back to full strength.

Made from heat- and moisture-resistant materials, it stands up to salt, vibration, and long hours on the water. It’s one of those small but vital parts that keeps your engine firing smooth and efficient all season long.

Why Buy OEM

Mercury’s OEM ignition components are designed for exact fit, proper resistance, and long life. Aftermarket wires may look similar but often lack the insulation quality or connector precision needed for reliable performance in marine conditions.

A genuine Quicksilver wire lead ensures the perfect fit and conductivity your ignition system was designed for — built and tested to Mercury’s exact standards.

FAQ

Q1: What engines fit the Quicksilver 821945A61 spark plug wire?
A: It fits Mercury and Mariner 30–300HP 2-stroke EFI, carbureted, and jet outboards, plus 90–120HP JetDrive/SportJet engines.

Q2: Is this a single wire or a set?
A: It’s one individual wire lead with boots installed on both ends.

Q3: How do I know if my wire needs replacing?
A: If you notice poor starting, misfires, or visible cracking or corrosion on the wire, it’s time to replace it.

Q4: Can I install it myself?
A: Yes. It’s a simple plug-and-play replacement using common tools.

Q5: Why OEM instead of aftermarket?
A: OEM wires match Mercury’s factory resistance specs and use high-quality insulation to handle heat, vibration, and moisture.