NGK Spark Plug - BR6HS
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The NGK BR6HS is a standard resistor spark plug used in select marine outboards, powersports engines, small engines, vintage vehicles, and utility equipment where the manufacturer specifies the BR6HS / NGK 3922 plug profile. It uses copper-core nickel construction, a built-in resistor, a short-reach 14 mm body, and a flat/gasket-seat design for dependable ignition service in compatible engines.
This plug should be installed only where the engine service manual, equipment label, or factory application chart specifically calls for NGK BR6HS, NGK 3922, or an approved equivalent.
Key Features
- Genuine NGK standard spark plug.
- NGK part number: BR6HS.
- NGK stock number: 3922.
- Copper-core nickel construction for standard service applications.
- Built-in resistor to help reduce ignition-related RFI noise.
- Thread diameter: 14 mm / M14 x 1.25.
- Thread reach: 12.7 mm / 1/2 in.
- Hex size: 13/16 in. / 21 mm.
- Seat style: flat / gasket seat.
- Tip style: non-projected.
- Heat range: 6.
- Factory preset gap reference: 0.028 in. / 0.7 mm.
- Terminal style: removable terminal nut / threaded stud, depending on ignition boot requirement.
- Distributor catalog formatting may appear as 41-3922.
Application Compatibility
Common application context includes select engines and equipment where the factory plug chart calls for NGK BR6HS / 3922, including:
- Select small-to-mid range two-stroke marine outboards where specified.
- Select Mercury, Yamaha, Suzuki, Johnson, Evinrude, OMC, Chrysler, and Clinton marine applications where the plug chart confirms BR6HS.
- Select powersports, snowmobile, ATV, and personal watercraft applications where specified.
- Select vintage automotive and specialty-engine applications requiring a short-reach 14 mm resistor plug.
- Select small utility engines and equipment where the manufacturer lists the BR6HS plug profile.
Use this plug only where the manufacturer's application chart lists BR6HS, 3922, or an approved equivalent.
Fitment Notice
Confirm fitment by exact engine brand, model, horsepower, serial number, model year, service manual, and spark plug chart before ordering. Spark plugs with the same 14 mm thread diameter can still differ in reach, heat range, seat style, terminal type, resistor design, projection, and required gap. Installing the wrong plug can cause hard starting, misfire, poor idle, overheating, thread damage, piston contact, or ignition-system issues.
When This Part Needs Replacement
Replace spark plugs during scheduled tune-up service or whenever the plug is worn, fouled, fuel-soaked, oil-contaminated, cracked, corroded, damaged, or causing hard starting, rough idle, hesitation, misfire, weak acceleration, or poor throttle response. Marine outboards and seasonal equipment should have plugs inspected regularly because long idle time, old fuel, oil mixture, moisture, and storage can accelerate fouling.
Installation Notes
Check the plug number and required gap before installation. Install into clean, undamaged cylinder head threads and tighten to the engine manufacturer's torque specification for the exact engine. Because this is a gasket-seat plug, confirm the sealing washer is present and seated correctly.
Avoid adding anti-seize unless the engine or spark plug manufacturer specifically calls for it, as thread lubricant can change clamping load and increase the risk of over-tightening. Confirm whether the ignition lead requires the removable terminal nut installed or removed before fitting the spark plug boot.
Alternate/Superseded Part Numbers
- NGK BR6HS — spark plug part number
- NGK 3922 — NGK stock number
- NGK stk 3922 — catalog stock-number reference
- 41-3922 — powersports/marine distributor catalog formatting
- MerCruiser 33813472 — marine reference; verify by engine serial number and plug chart
- OMC 503949 — marine reference; verify by engine model and plug chart
- OMC 503950 — marine reference; verify by engine model and plug chart
- OMC 504082 — marine reference; verify by engine model and plug chart
- Suzuki 09482-00088 — cross-reference; verify by model and plug chart
- Yamaha 94701-00248 — cross-reference; verify by model and plug chart
- Denso W20FSR / W20FSR-U — cross-reference; verify by application
- Champion QL86C / RL86C — cross-reference; verify by application
Parts Desk Insight
The BR6HS is a short-reach, gasket-seat resistor plug. It should not be confused with longer-reach BR6ES-style plugs or wider-gap BR6HS-10 variants. Match the exact plug number, reach, gap, heat range, and terminal setup to the engine's service chart before installation.
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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
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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.
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