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NGK BP4HS Standard Copper Spark Plug (3611)
Original price was: £7.39.£3.46Current price is: £3.46.
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Workshop Fitting
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NGK BP4HS Spark Plug – Stock No. 3611
The NGK BP4HS is a standard copper-core spark plug with a projected tip. It gives reliable ignition and resists fouling in low to mid-load use. It is a non-resistor type, ideal where simple, strong spark delivery is preferred.
It suits many classic small-capacity engines and older ignition systems that specify a 14 mm thread with 1/2 inch reach and a projected tip. Always confirm fitment using the site’s vehicle lookup or check the Vehicle Fitment tab.
- Strong cold starting and clean idle from the projected insulator design.
- Durable nickel alloy electrodes with a copper core for good heat transfer.
- Non-resistor type for maximum spark energy. If your vehicle needs radio-noise suppression, choose an NGK R plug instead.
| Part Number | BP4HS |
| NGK Stock Number | 3611 |
| GTIN | 087295136119 |
| Category | 686 – Spark Plug |
| Thread Diameter | 14 mm |
| Thread Pitch | 1.25 |
| Reach (thread length) | 12.7 mm (1/2 inch) |
| Seat Type | Gasket (flat seat) |
| Hex Size | 20.8 mm (13/16 inch) |
| Heat Range | 4 (NGK scale – hotter) |
| Resistor | No |
| Centre Electrode | Copper core, nickel alloy |
| Ground Electrode | Standard single |
| Tip Style | Projected insulator |
| Terminal | Solid (fixed) |
| Factory Gap | Typically 0.6 – 0.7 mm (set to the engine maker’s spec) |
| Torque – 14 mm gasket seat | 18 – 22 Nm into aluminium heads (25 – 30 Nm into cast iron) |
| Operating Fuel Types | Petrol – suitable for many 2-stroke and 4-stroke applications |
Fitment Guidance
Suitable for many classic motorcycles, scooters, small marine outboards, and garden equipment that call for a BP4HS plug. Heat range and gap must match the engine specification. Use the site’s vehicle lookup to confirm fitment, or see the Vehicle Fitment tab.
The price displayed is for a single plug, please add the desired amount to your basket.
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-3611 Confirmed Fitment
Our team haven't provided any fitment data for this product yet, please get in touch or check back later!
Stock at Progressive Parts
Delivery timescales are given as estimates in good faith, but cannot be taken as precise or exact information. We highly advise against booking installation/workshop time or engaging in preparatory work until you've received and inspected the goods.
What do our stock statuses mean?
1+ IN STOCK in green stock is readily available in one of our warehouses for express delivery (at the time of viewing).
LOW STOCK in green means we're running low! 1 or 2 left on the shelf so act fast. Over evenings, weekends and bank holidays this stock can move quickly so please bear this in mind.
0 IN STOCK in blue means our primary warehouse does not have unallocated stock, but our UK partners do. Often these can be shipped quickly and efficiently. You'll be notified via the Track My Order page if further delays are unavoidable.
MADE TO ORDER in blue means we've partnered with a supplier which primarily makes their products to order. It's not on our shelf, but your order goes into production immediately.
0 IN STOCK in orange means everybody we work with is unfortunately out of stock. Stock is not available in the UK. The best course of action is to place an order to create an allocation from the next batch arriving.
OUT OF STOCK in red. This product is unavailable to order, for whatever reason we're unable to obtain stock or there is an issue with supply/lead times.
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Our staff are car enthusiasts, we understand the need for speed... This includes getting your orders out the door as quickly and securely as possible!
In some instances, extended lead times are unavoidable. This is as labour-intensive and frustrating for us as it is for you, please know we are doing our best to facilitate your modification goals. Abuse of our staff or systems will not be tolerated.
Thank you, Team PP
In the words of the Vehicle Standards Agency (VCA), type approval provides "confirmation that production and samples of a design will meet specified performance standards".
For emissions components this encompasses noise, emissions and balanced back pressure, which have a strong influence on maintaining engine performance (power), and fuel efficiency. Type approval ensures that an aftermarket component will reach, or exceed the performance standard of the corresponding OE part.
Type-approval then, is a certain guarantee that an end user will receive a product of OE equivalent performance attributes.
Products on the Progressive Parts website that meet this approval will be clearly marked or labelled EC or ECE approved.