Mercury – Quicksilver 816737Q NGK BP8HN-10 V-Power Spark Plug | Sold Individually | OEM Marine Plug | 816737Q

Overview

A smooth-running engine starts with a good spark. The Quicksilver 816737Q NGK BP8HN-10 V-Power Spark Plug gives your outboard or inboard the reliable ignition it needs for clean starts and consistent power. This genuine NGK plug features a “V”-cut electrode that helps the spark jump more easily and burn fuel more efficiently — a small upgrade that makes a big difference in how your engine performs.

Each plug comes pre-gapped to Mercury’s factory specs, so it’s ready to install right out of the box. Whether you’re chasing top speed or just want easy starts at the dock, this OEM plug helps your motor fire crisp and run strong every time.

Key Features

• Purpose: Provides consistent, high-energy spark for better ignition and fuel efficiency.
• Fitment: For Mercury and Mariner marine engines that specify NGK BP8HN-10 spark plugs.
• Design: Unique V-Power center electrode directs spark to the edge for cleaner combustion.
• Durability: Trivalent metal plating prevents corrosion and seizing in marine environments.
• Construction: Pure alumina-silicate ceramic insulator improves strength and heat transfer.

Engine & Boat Compatibility

• Fits multiple Mercury and Mariner outboards and MerCruiser inboards that call for NGK BP8HN-10 plugs
• Common on high-performance two-stroke and four-stroke marine engines

Performance & Practical Benefits

The 816737Q spark plug delivers reliable firing under the demanding conditions of marine use. The “V” groove design improves ignitability, giving smoother idle, quicker starts, and cleaner throttle response. The copper core pulls heat away from the electrode for better temperature control and plug life.

With corrosion-resistant plating, these plugs stay easy to remove even after seasons in saltwater. Replace all your plugs at once and you’ll notice stronger acceleration, steadier RPMs, and more confident restarts after long runs or long layups.

Why Buy OEM

Mercury-approved NGK plugs are built for marine duty — constant load, moisture, and heat. Automotive equivalents often can’t handle the same sustained stress or wet conditions. Using the correct OEM-specified plug ensures proper heat range, ignition timing, and overall reliability.

A genuine Quicksilver NGK plug means factory-level performance, easy installation, and long service life — the same quality trusted by Mercury technicians around the world.

FAQ

Q1: Which engines use the Quicksilver 816737Q plug?
A: Any Mercury or Mariner engine that specifies NGK BP8HN-10 in the owner’s manual.

Q2: Are the plugs pre-gapped?
A: Yes, they’re pre-gapped to Mercury’s specs, but it’s always good practice to verify before installing.

Q3: What’s special about the “V” design?
A: The V-cut electrode directs the spark toward the edge, improving ignition and combustion efficiency.

Q4: Can it handle saltwater use?
A: Absolutely. The trivalent plating prevents corrosion and thread seizure, even in saltwater conditions.

Q5: How often should spark plugs be replaced?
A: Inspect yearly and replace every 100 hours, or sooner if performance drops.