Spark Plug
Champion RS12YC
1 compatible model
The Champion RS12YC is an aftermarket spark plug compatible with 1 model across 1 brand. It is a direct cross-reference for OEM part number 98079-55846. Compatible equipment includes Honda GX120.
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.
Some links may be affiliate links. Match the OEM number, dimensions, and model variant before buying.
Compatible Models
| Brand | Model | OEM # | Confidence | Source | Reviewed | Evidence | |
|---|---|---|---|---|---|---|---|
| Honda | GX120 | 98079-55846 | Medium | Aftermarket catalog | 2026-05-20 | 0.7-0.8mm gap | Small Engine |
What this part is
Champion RS12YC 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
98079-55846
Alternate spellings
RS12YC 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
- 0.7-0.8mm 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
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.