This spark plug has superseded to the Champion spark plug L78V

Mercury – NGK BUHW-2 Spark Plug | Surface Gap Ignition Component | Tungsten & Ceramic | Part Number 896329833

Overview

There’s a special kind of confidence that comes from an engine that lights off instantly, every single time no hesitation, no sputter, just a clean spark that settles into a steady, reliable rhythm. The NGK BUHW-2 Spark Plug brings that feeling back to your Mercury Marine setup. It’s a simple part, but it carries a big responsibility, and when it’s doing its job right, you hear it in the smooth idle against the dock and feel it every time your boat lifts onto plane without complaint. You may never see this plug once it’s installed, but you’ll appreciate the difference it makes on every trip.

Key Features

• Surface gap spark plug design with no side electrode for superior pre-ignition resistance
• Tungsten center electrode for strong durability and clean, consistent spark
• Pure alumina silicate ceramic insulator for strength and heat transfer
• Ribbed suppressor seal helps prevent flashover, misfires, and leakage
• Trivalent metal plating provides anti-corrosion and easier plug removal
• Solid terminal construction for reliable electrical contact

Engine & Boat Compatibility

• Fits select Mercury and Force engines requiring NGK BUHW-2 spark plugs
• Common in older TwoStroke applications and specific marine ignition systems
• Suitable for lightweight runabouts, inflatables, center consoles, fishing rigs, and jet-powered craft
• Always verify compatibility with your engine’s owner’s manual

Performance & Practical Benefits

The BUHW-2 surface gap design gives this plug a unique advantage — it’s far more resistant to pre-ignition and knocking than traditional side-electrode plugs. That means smoother combustion, especially in high-load situations where TwoStroke engines can get hot and stressed. The tungsten electrode delivers a crisp spark, helping your engine fire cleanly even after long periods of idling, trolling, or stop-and-go maneuvering around docks and ramps.

You’ll notice the difference in how the motor behaves on the water. Starts feel quicker, the idle holds steady without coughing or stumbling, and the throttle response feels more predictable when the bow climbs and the boat transitions to plane. The ceramic insulator sheds heat efficiently, protecting against fouling and ensuring the firing tip stays clean. Add in the trivalent plating, and you get a plug that stays protected from corrosion in both saltwater and freshwater.

For anyone who spends time around older Force or niche Mercury ignition setups, this plug brings back the dependability those engines were meant to have. It doesn’t just fire — it helps the whole engine feel more confident.

Why Buy OEM

Surface gap plugs need to match the exact ignition timing and combustion design of the engine they serve. Aftermarket substitutes often look similar but fail to meet the precise tolerances required for marine conditions. Mercury Marine and NGK have tested this plug extensively to ensure it delivers consistent spark, proper heat dissipation, and dependable operation across the entire rpm range. Choosing the OEM-specified plug means fewer headaches, fewer misfires, and more time enjoying the water without surprises.

FAQ

Q1: Which engines does the NGK BUHW-2 plug fit?

It fits select Mercury and Force engines that specifically require NGK BUHW-2.

Q2: Why choose this OEM plug over aftermarket?

It’s built to Mercury Marine specifications, offering better pre-ignition resistance and long-term stability.

Q3: How do I confirm this is the right replacement?

Check your engine owner’s manual — if it lists BUHW-2 or part number 896329833, this is the correct plug.

Q4: Can it be used in both saltwater and freshwater?

Yes. The materials and plating are designed for harsh marine environments.

Q5: Is installation straightforward?

Absolutely — simply remove the old plug and install this one using a standard spark plug socket.