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NGK BM6F Standard Spark Plug (6221)
RRP. £5.60£2.61SAVE £2.99 (53%)
NGK BM6F Spark Plug – Stock No. 6221
The NGK BM6F is a standard nickel spark plug for small engines. It offers reliable cold starts, clean idle, and steady performance. The copper core draws heat away from the tip to reduce fouling, especially useful in two-stroke use. The solid terminal suits fixed plug caps often found on garden machinery and small motorcycles.
Use it to refresh tired ignition, improve starting, and keep combustion consistent. It is a non-resistor plug, so only use where a non-resistor type is specified.
- Reliable starting and smooth running in small-capacity engines
- Durable nickel electrode with copper core for stable heat control
| Part number | BM6F |
|---|---|
| NGK stock number | 6221 |
| Part category | 686 – Spark Plug |
| GTIN | 087295162217 |
| Thread diameter | 14 mm |
| Thread reach | 9.5 mm |
| Hex size | 20.8 mm (13/16 in) |
| Seat type | Gasket |
| Heat range | 6 (NGK scale) |
| Resistor | No |
| Terminal type | Solid terminal |
| Electrode material | Nickel alloy, copper core |
| Electrode design | Standard, non-projected |
| Factory gap | 0.7 mm (adjust to manufacturer spec) |
Fitment guidance
Commonly used in many small engines, including two-stroke garden tools, scooters, mopeds, small off-road bikes, and marine outboards that specify a 14 mm, short-reach, non-resistor plug with a solid terminal. Please use the vehicle lookup to confirm fitment or check the Vehicle Fitment tab for full details.
Note: Only use a non-resistor plug if specified by the manufacturer. If your ignition requires an R-type plug, choose the correct resistor equivalent.
The price displayed is for a single plug, please add the desired amount to your basket.
Additional Information
| Weight | 0.05 kg |
|---|---|
| Dimensions | 10 × 3 × 3 cm |
| Brand |
NGK-6221 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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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.