Spark Plug

Champion RCJ6Y

34 associated model records

The Champion RCJ6Y is listed as an aftermarket spark plug in 34 model records across 2 brands. Those records reference OEM part numbers 503235108, 577316701, 503235111, 0000 400 7000. Associated equipment records include Husqvarna 120, Husqvarna 125L, Husqvarna 128C, Husqvarna 128LD, Husqvarna 130, and 29 more. 7 records include an assigned confidence, source type, and review date.

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

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Model Records

Brand	Model	OEM #	Confidence	Source	Reviewed	Evidence
Husqvarna	120	503235108	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	128LD	577316701	Medium	Aftermarket catalog	2026-05-21	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	240	503235111	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
Husqvarna	576 XP	503235111	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.5mm gap	Chainsaw
Stihl	FS 38	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	0.7mm gap	Trimmer
Stihl	FS 40	0000 400 7000	Confidence not assigned	Evidence source not recorded	Not yet independently reviewed	0.7mm gap	Trimmer
Stihl	FS 45	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	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	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 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 250	0000 400 7000	Medium	Aftermarket catalog	2026-05-21	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

Champion RCJ6Y is listed here as a spark plug replacement option. Use this page as a fitment cross-reference, then confirm the removed part, model plate, and seller listing details before buying.

OEM numbers it replaces

503235108, 577316701, 503235111, 0000 400 7000

Alternate spellings

RCJ6Y 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

0.5mm gap
0.6mm gap
0.7mm gap
0.5mm plug gap

Symptoms that suggest replacement

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

How to verify before buying

Confirm your equipment is one of the compatible models listed above.
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 120 spark plug Husqvarna 125L spark plug Husqvarna 128C spark plug Husqvarna 128LD spark plug Husqvarna 130 spark plug Husqvarna 135 spark plug Husqvarna 135L spark plug Husqvarna 240 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.Champion RCJ6Y vs NGK BPMR7AA practical spark plug comparison for small 2-stroke equipment, including how to use cross-reference pages without assuming fitment.Best Spark Plugs for Common Small EnginesA fitment-first guide to common small-engine spark plugs, including two-stroke trimmer and chainsaw plugs plus four-stroke mower plugs.

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.