WhichPartFits.com

Spark Plug

Champion RCJ6Y

34 compatible models

The Champion RCJ6Y is an aftermarket spark plug compatible with 34 models across 2 brands. It is a direct cross-reference for OEM part numbers 503235108, 577316701, 503235111, 0000 400 7000. Compatible equipment includes Husqvarna 120, Husqvarna 125L, Husqvarna 128C, Husqvarna 128LD, Husqvarna 130, and 29 more.

See a wrong fitment? Report a correction.
Verify before ordering: Fitment can vary by serial number, production date, region, and sub-model. Match the OEM number and physical dimensions before ordering.

Amazon Buying Check

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

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Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.

Compatible Models

BrandModelOEM #ConfidenceSourceReviewedEvidence
Husqvarna120503235108MediumAftermarket catalog2026-05-210.5mm gapChainsaw
Husqvarna125L577316701MediumAftermarket catalog2026-05-200.6mm gapTrimmer
Husqvarna128C577316701MediumAftermarket catalog2026-05-200.6mm gapTrimmer
Husqvarna128LD577316701MediumAftermarket catalog2026-05-210.6mm gapTrimmer
Husqvarna130503235111MediumAftermarket catalog2026-05-200.5mm gapChainsaw
Husqvarna135503235111MediumAftermarket catalog2026-05-200.5mm gapChainsaw
Husqvarna135L577316701MediumAftermarket catalog2026-05-200.6mm gapTrimmer
Husqvarna240503235111MediumAftermarket catalog2026-05-200.5mm gapChainsaw
Husqvarna525L577316701MediumAftermarket catalog2026-05-200.6mm gapTrimmer
Husqvarna576 XP503235111MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlFS 380000 400 7000MediumAftermarket catalog2026-05-210.7mm gapTrimmer
StihlFS 400000 400 7000MediumAftermarket catalog2026-05-200.7mm gapTrimmer
StihlFS 450000 400 7000MediumAftermarket catalog2026-05-210.7mm gapTrimmer
StihlFS 550000 400 7000MediumAftermarket catalog2026-05-200.7mm gapTrimmer
StihlMS 1700000 400 7000MediumAftermarket catalog2026-05-200.5mm plug gapChainsaw
StihlMS 1800000 400 7000MediumAftermarket catalog2026-05-210.5mm gapChainsaw
StihlMS 2010000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2100000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2110000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2300000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2500000 400 7000MediumAftermarket catalog2026-05-210.5mm gapChainsaw
StihlMS 2510000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2610000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2710000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 2910000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 3110000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 3610000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 3620000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 3910000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 400 C-M0000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 4410000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 4610000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 462 C-M0000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw
StihlMS 6600000 400 7000MediumAftermarket catalog2026-05-200.5mm gapChainsaw

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 plugHusqvarna 125L spark plugHusqvarna 128C spark plugHusqvarna 128LD spark plugHusqvarna 130 spark plugHusqvarna 135 spark plugHusqvarna 135L spark plugHusqvarna 240 spark plugChampion RC12YC spark plugNGK BPR5ES spark plugChampion CJ8Y spark plugNGK BPM8Y spark plugNGK BPMR8Y spark plugChampion 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.