NGK DR7EA 7839 Spark Plug Honda BF25 BF30 4-Stroke Outboard
DR7EA-NGK
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NGK DR7EA Spark Plug for Honda Outboards
NGK Standard Nickel Spark Plug | DR7EA / 7839
Genuine NGK DR7EA resistor spark plug with a 12 mm gasket-seat shell, 19 mm reach and 0.7 mm nominal gap. NGK’s outboard application finder specifies DR7EA for selected Honda 25 HP and 30 HP four-stroke families.
Key Features
- ✔ Standard nickel centre electrode
- ✔ Built-in resistor helps suppress radio-frequency interference
- ✔ 12 mm × 1.25 thread
- ✔ 19 mm reach with gasket seat
- ✔ NGK heat range 7
- ✔ Sold individually
Technical Specs
| NGK code | DR7EA |
| NGK stock number | 7839 |
| Thread | 12 mm × 1.25 |
| Reach | 19 mm / 3/4 in |
| Hex | 18 mm |
| Seat | Gasket |
| Nominal gap | 0.7 mm / 0.028 in |
| Heat range | 7 |
| Resistor | Yes |
Compatibility / Fitment Guide
Verified NGK applications: selected Honda BF25B, BF25D-series and BF30D-series 3-cylinder four-stroke outboards for which NGK’s part finder or Honda manual specifies DR7EA. The Honda BF25D/BF30D owner’s manual lists DR7EA with a 0.60–0.70 mm service gap.
Before ordering: read the full model code and serial number from the transom bracket, then check the ignition specification. Honda has used different plugs across generations and markets.
Not interchangeable: DPR7EA-9 has a projected tip and 0.9 mm suffix gap; DR8EA has a different heat range. Use only if the engine documentation explicitly lists the alternative.
Part Number Cross Reference
| NGK part | DR7EA |
| NGK stock | 7839 |
| Honda manual equivalent | Denso X22ESR-U |
| 4Boats SKU | DR7EA-NGK |
Cross-reference numbers identify applications; always confirm the engine model, serial range and plug specification before substitution.
Frequently Asked Questions
How many plugs does a BF25/BF30 use?
These are three-cylinder engines, but this listing supplies one plug.
Is the gap 0.7 mm?
NGK’s nominal gap is 0.7 mm; the Honda BF25D/BF30D manual gives a 0.60–0.70 mm service range.
Can I use DPR7EA-9 instead?
Not unless the exact engine manual permits it; projected-tip construction and suffix gap differ.
What torque should I use?
Follow the Honda manual for the engine and cylinder head; generic dry-plug torque is not a substitute for manufacturer instructions.
Fit only the plug specified by the engine manufacturer. Check the gap before installation and use the torque stated for the engine’s cylinder-head material and service condition.
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