Mercury – Quicksilver 816761Q5 Spark Plug Wire Kit | 4-Cylinder MerCruiser Engines | Points Ignition | 816761Q5

Overview

If your old MerCruiser hesitates when you turn the key or idles rough after warm-up, it’s probably time for new plug wires. The Quicksilver 816761Q5 Spark Plug Wire Kit gives your 4-cylinder MerCruiser (1963–1995) the clean, consistent spark it needs to run like it should.

Built for points-style ignition systems, these OEM wires fit exactly as the originals did. Each lead is cut to length and tipped with snug molded boots that keep out moisture and corrosion. It’s an easy upgrade that can wake up an older motor in a single afternoon.

Key Features

• Purpose: Replaces worn wires to restore strong ignition and reliable spark delivery.
• Fitment: For 4-cylinder MerCruiser engines (1963–1995) with conventional points ignition.
• Complete Kit: Includes four plug wires, each with molded boots at the spark-plug ends.
• Marine-Tough: Flexible insulation stands up to heat, vibration, and spray without cracking.
• OEM Quality: Built and tested to Mercury’s factory standards for fit, resistance, and longevity.

Engine & Boat Compatibility

• All 4-cylinder MerCruiser sterndrives and inboards from 1963–1995
• Common on classic bowriders, small cruisers, and fishing boats

Performance & Practical Benefits

New wires mean a stronger, cleaner spark — and that shows up right away in how your engine runs. The 816761Q5 kit helps eliminate misfires, hard starts, and sluggish throttle. Each wire’s low-resistance core delivers full voltage to every cylinder, while the thick insulation keeps that spark from bleeding off through heat or vibration.

The molded boots stay tight on the plugs and distributor, sealing out water and grime that can cause weak spark or corrosion. Once installed, you’ll notice easier starts, steadier idle, and better fuel economy — proof that small fixes can make a big difference.

Why Buy OEM

Marine engines live tougher lives than car motors. Constant moisture, heat, and motion eat away at cheap aftermarket parts. Mercury’s OEM wire sets are built from the right materials and sized exactly for your drive, so they fit perfectly and last for seasons.

A genuine Quicksilver wire kit is the sure way to get the same reliability your MerCruiser had when it was new — no guessing, no trimming, no early failures.

FAQ

Q1: What engines fit this kit?
A: All 4-cylinder MerCruiser engines (1963–1995) with points ignition systems.

Q2: What’s included?
A: Four pre-cut spark plug wires with molded ends for quick, secure installation.

Q3: Will they hold up in saltwater?
A: Yes. The insulation and connectors are designed for salt or freshwater use.

Q4: Can I install them myself?
A: Definitely. Just replace one wire at a time to keep the firing order straight — no special tools needed.

Q5: Why OEM instead of generic wires?
A: OEM wires match Mercury’s specs for length and resistance, giving longer life and reliable spark that aftermarket versions rarely match.