NGK Spark Plug - BR6ES
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The NGK BR6ES is a standard copper-core nickel spark plug used in select marine outboards, motorcycles, ATVs, small engines, and utility equipment where the manufacturer specifies the BR6ES / NGK 4922 plug profile. It features a resistor design to help reduce ignition-related RFI noise and a gasket-seat 14 mm body for engines that require this plug style.
Key Features
- NGK part number: BR6ES
- NGK stock number: 4922
- Copper-core nickel construction
- Built-in resistor for RFI suppression
- Thread diameter: 14 mm
- Thread reach: 19 mm / 3/4 in.
- Hex size: 13/16 in. / 21 mm
- Seat style: flat / gasket seat
- Heat range: 6
- Factory preset gap reference: 0.035 in. / 0.9 mm
- Standard non-projected firing-end design
Application Compatibility
Common application context includes engines where the factory plug chart calls for NGK BR6ES / 4922, including:
- Select Mercury / Mariner outboard applications where specified
- Select powersports and ATV engines where specified
- Select vintage motorcycle applications where specified
- Select small-engine, generator, saw, and utility equipment applications where specified
Use this plug only where the manufacturer's application chart lists BR6ES, 4922, or an approved equivalent.
Fitment Notice
Confirm fitment by exact engine model, serial number, year, service manual, and factory spark plug chart before ordering. Spark plugs with the same thread size can still differ in reach, heat range, seat style, projection, terminal type, resistor design, and required gap.
When This Part Needs Replacement
Replace spark plugs during scheduled tune-up service or when the plug is worn, fouled, oil-contaminated, fuel-soaked, corroded, cracked, or causing hard starting, rough idle, hesitation, misfire, or poor low-speed running.
Installation Notes
Check the required gap before installation. Install into clean, undamaged threads and tighten to the engine manufacturer's torque specification. Because this is a gasket-seat plug, confirm the sealing washer is present and seats correctly. Avoid anti-seize unless the manufacturer specifically calls for it.
Alternate/Superseded Part Numbers
- NGK BR6ES
- NGK 4922
- Mercury 33-813471 1 — marine reference; verify by engine serial number and plug chart
- BR6EIX — iridium-style upgrade reference; verify by application
- BR6EG — fine-wire/racing-style reference; verify by application
Parts Desk Insight
The BR6ES should be matched by exact plug number and engine chart, not by thread size alone. Correct reach, gasket-seat design, heat range, and gap are critical for reliable ignition and cylinder-head safety.
Shipping: Ships same or next day for fast Canada wide shipping. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.