Champion RJ14YC Spark Plug | #63 | 4-Pack | Small 4-Stroke Engine & Marine Auxiliary
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A Versatile Resistor Spark Plug for Small 4-Stroke Engines — 4-Pack.
The Champion RJ14YC is a projected-tip, resistor-type spark plug widely used in small 4-stroke engines across marine, lawn and garden, and light power equipment applications. Part number 63, the YC-series design features a projected tip for improved ignitability and a built-in resistor to suppress radio frequency interference — making it well-suited for use near marine electronics and communication equipment.
Sold in a 4-pack (Champion part 10306). Always verify fitment against your engine's owner's manual or Champion application guide before ordering.
Key Features
- Champion RJ14YC spark plug — 4-pack (Champion #63)
- Projected tip for improved ignitability and combustion efficiency
- Built-in resistor suppresses radio frequency interference (RFI)
- Copper core electrode for reliable heat transfer and consistent spark
- Widely used across small 4-stroke engine applications
Compatible Applications
- Kawasaki small 4-stroke engines specifying Champion RJ14YC or equivalent
- Kohler small 4-stroke engines specifying Champion RJ14YC or equivalent
- Marine generators and auxiliary engines specifying RJ14YC or equivalent
- Lawn and garden equipment (mowers, tractors) with small 4-stroke engines specifying RJ14YC
- Any application cross-referencing Champion #63 or part 10306
- Verify fitment using your engine's owner's manual or the Champion spark plug application guide
Parts Desk Insights
The RJ14YC is one of Champion's most widely used small engine plugs — it covers a broad range of 4-stroke applications from marine generators to lawn equipment. If you're doing seasonal maintenance on a small 4-stroke engine, replacing the spark plug is one of the lowest-cost, highest-impact steps you can take. A fresh plug restores easy starting and smooth idle on engines that have been sitting over winter.
For marine outboard spark plugs, see the Champion QL77JC4 #828M for Mercury 4-stroke outboards or the Champion QL78YC #938M for Evinrude/Johnson 4-stroke outboards. For other small engine plug options, see the Champion L82YC #328.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.