NGK BP6HS (Stock No. 4511) – Standard Projected Spark Plug
The NGK BP6HS is a copper-core, nickel-tipped spark plug with a projected insulator for clean, consistent ignition. It is a non-resistor plug designed for engines that specify a 14 mm, gasket-seat plug with 12.7 mm thread reach.
It helps cold starts, reduces fouling, and keeps combustion stable under daily use. The projected tip places the spark in a better position in the chamber for a cleaner burn.
Always confirm the exact plug type and gap in your vehicle’s service information.
Where it’s commonly used
– Frequently specified for many classic motorcycles, scooters, small marine outboards, and small engines that require a 14 mm, 12.7 mm reach, gasket-seat plug without a resistor. Use the vehicle lookup to confirm fitment, or check the Vehicle Fitment tab for full details.
Why choose this plug
– Reliable spark and smooth idle
– Good heat control from copper core
– Projected tip helps resist fouling in stop-start use
– Durable nickel alloy for long service life
| Part number | BP6HS |
|---|---|
| NGK stock number | 4511 |
| GTIN | 087295145111 |
| Category | 686 – Spark Plug |
| Thread diameter | 14 mm |
| Thread reach | 12.7 mm (1/2 inch) |
| Seat type | Gasket (flat seat) |
| Hex size | 20.8 mm (13/16 inch) |
| Heat range | 6 (medium) |
| Resistor | No (non-resistor) |
| Projection | Projected insulator |
| Centre electrode | Copper core, nickel alloy tip |
| Ground electrode | Standard single |
| Gap (as supplied) | Approx. 0.7 mm (adjust to spec) |
| Terminal type | Solid terminal |
Note: Non-resistor plugs may cause electrical noise in radios or sensitive electronics. If your vehicle specifies a resistor plug, choose the correct R-type alternative.
The price displayed is for a single plug, please add the desired amount to your basket.


