Spark Plug

NGK BPMR7A

44 associated model records

Identity: Unclassified

The NGK BPMR7A is listed as a part-number spark plug in 44 model records across 3 brands. Those records reference OEM part numbers 577316701, 537254402, 0000 400 7000, 503235111, 952030150, 1110 400 7005. Associated equipment records include Husqvarna 128LD, Husqvarna 455 Rancher, Stihl FS 38, Stihl FS 45, Stihl MS 170, and 39 more. 7 records include an assigned confidence, source type, and review date.

Verify before ordering: Fitment can vary by serial number, production date, region, and sub-model. Match the OEM number and physical dimensions before ordering.

Cross-reference and fitment check

RCJ6Y and BPMR7A appear in manufacturer cross-reference material, but that relationship does not prove equipment fitment. Compare the 14 mm thread, 9.5 mm reach, resistor design, seat and terminal style, heat range, and the exact equipment-manual gap before substituting either plug.

Amazon Buying Check

Use the Amazon listing to compare kit contents, seller details, shipping, and OEM compatibility notes before ordering.

View this exact listing on AmazonAmazonAffiliate link

As an Amazon Associate, WhichPartFits may earn from qualifying purchases. Match the OEM number, dimensions, and model variant before buying.

Model Records

Brand	Model	OEM #	Confidence	Source	Reviewed	Evidence
Husqvarna	128LD	577316701	Medium	Aftermarket catalog	2026-05-21	0.6mm gap	Trimmer
Husqvarna	455 Rancher	537254402	Medium	Aftermarket catalog	2026-05-21	0.5mm gap	Chainsaw
Stihl	FS 38	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	0.7mm gap	Trimmer
Stihl	FS 45	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	0.7mm gap	Trimmer
Stihl	MS 170	0000 400 7000	Medium	Aftermarket catalog	2026-05-20	0.5mm plug gap	Chainsaw
Stihl	MS 180	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	0.5mm gap	Chainsaw
Stihl	MS 250	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	0.5mm gap	Chainsaw
Husqvarna	125L	577316701	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.6mm gap	Trimmer
Husqvarna	128C	577316701	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.6mm gap	Trimmer
Husqvarna	130	503235111	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	135	503235111	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	135L	577316701	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.6mm gap	Trimmer
Husqvarna	323L	537254402	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Trimmer
Husqvarna	435	537254402	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	440	537254402	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	445	537254402	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	450	537254402	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	460 Rancher	537254402	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Husqvarna	525L	577316701	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.6mm gap	Trimmer
Poulan Pro	P3314	952030150	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	Champion RCJ-7Y; 0.025" gap	Chainsaw
Poulan Pro	P3816	952030150	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	Champion RCJ-7Y; 0.025" gap	Chainsaw
Poulan Pro	PP4218A	952030150	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	Champion RCJ-7Y; 0.025" gap	Chainsaw
Poulan Pro	PP4620AV	952030150	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	Champion RCJ-7Y; 0.025" gap	Chainsaw
Stihl	BG 55	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	BPMR7A; 0.5mm gap	Blower
Stihl	FS 40	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.7mm gap	Trimmer
Stihl	FS 55	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.7mm gap	Trimmer
Stihl	FS 85 R	1110 400 7005	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.7mm gap	Trimmer
Stihl	MS 201	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 210	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 211	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 230	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 251	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 261	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 271	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 291	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 311	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 361	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 362	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 391	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 400 C-M	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 441	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 461	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 462 C-M	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	MS 660	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw

What this part is

NGK BPMR7A is listed here as a part-number spark plug option. Identity describes the named part, not automatic compatibility with every model record. Confirm the removed part, model plate, and seller listing details before buying.

Recorded identity categories

Unclassified: 44 model records

OEM, OEM-specified, aftermarket, and cross-reference identities are reported separately. Unclassified records are not promoted to confirmed fitment.

Recorded OEM references

577316701, 537254402, 0000 400 7000, 503235111, 952030150, 1110 400 7005

Alternate spellings

BPMR7A is the normalized part number used on this site.

Known exclusions

No specific exclusion is listed in the current data. Still verify serial range, production variant, and removed-part details before ordering.

Dimensions and specs

0.6mm gap
0.5mm gap
0.7mm gap
0.5mm plug gap
Champion RCJ-7Y; 0.025" gap
BPMR7A; 0.5mm gap

Symptoms that suggest replacement

Won't start
Hard hot restart
Rough idle
Fuel-fouled or carbon-heavy plug

How to verify before buying

Treat the model rows above as research leads, not confirmed fits, unless the individual relationship includes adequate review evidence.
Match the OEM number, stamped part number, or physical spec against the removed part.
Read the model-specific evidence, confidence, source, reviewed date, dimensions, notes, and exclusions before opening an Amazon listing.

Common wrong-fit mistakes

Ordering from a broad model-family listing without checking the exact equipment model.
Ignoring the old OEM number, stamped part number, or physical dimensions.
Matching the plug number but missing the required gap, terminal style, or thread reach.

Related model and part pages

Husqvarna 128LD spark plug Husqvarna 455 Rancher spark plug Stihl FS 38 spark plug Stihl FS 45 spark plug Stihl MS 170 spark plug Stihl MS 180 spark plug Stihl MS 250 spark plug Husqvarna 125L spark plug Champion RC12YC spark plug NGK BPR5ES spark plug Champion CJ8Y spark plug NGK BPM8Y spark plug NGK BPMR8Y spark plug Champion RS12YC spark plug

Related Repair Guides

Stihl MS170 Tune-Up Parts: What Actually FitsA tune-up overview for the Stihl MS170 chainsaw covering spark plug, air filter, fuel filter, carburetor, bar, and chain lookup steps.NGK BPMR7A Cross-Reference for Small EnginesHow to use the NGK BPMR7A part page to check compatible models, OEM references, and common alternatives.Where to Find the Model Number on Echo TrimmersHow to identify an Echo trimmer model before ordering carburetors, filters, primer bulbs, fuel lines, or trimmer heads.Honda GX160 Annual Maintenance PartsA seasonal maintenance checklist for Honda GX160 engines with links to common spark plug, air filter, and carburetor lookup pages.

Amazon buying cautions

Check that the Amazon listing includes the exact part number or verified cross-reference shown here.
Compare kit contents, gaskets, fuel lines, bulbs, plugs, filters, and dimensions against the removed part before checkout.
A listing title can mention the right model and still include the wrong revision, accessory, or generic substitute.