Champion Spark Plug Copper Plus RN11YC4 for Small Engines | OEM Replacement Part

CHAMPION Spark Plugs Champion RN11YC4 — Copper Plus Spark Plug Also known as: Copper Core Spark Plug, Small Engine Spark Plug, Champion Resistor Plug 🚚 Orders Before 2PM Ship Same Day! GENUINE OEM   ·   SAME-DAY SHIP   ·   EXPERT SUPPORT Specifications Specification Detail Part Number RN11YC4 Brand Champion Spark Plugs Series Copper Plus Thread Size 14mm Hex Size 5/8 in. (16mm) Gap 0.040 in. (pre-gapped) Heat Range 11 (Medium) Application 4-Cycle Small Engines Quantity 1 Plug per Pack The Champion RN11YC4 is a Copper Plus spark plug designed as a direct-fit replacement for 4-cycle small engines found in lawn mowers, riding tractors, generators, and other outdoor power equipment. Also referred to as the Champion Copper Core plug or resistor spark plug, the RN11YC4 features a copper-core center electrode that promotes efficient heat transfer and consistent spark performance. This plug is a widely used OEM-style replacement for brands including Briggs and Stratton, Kohler, Kawasaki, and Tecumseh powered equipment, making it one of the most versatile small engine spark plugs available. Key Features ▼ Copper Plus Core Electrode The RN11YC4 uses a pure copper core center electrode that delivers superior heat dissipation and consistent spark energy. Champion's Copper Plus construction is engineered to meet or exceed OEM ignition specifications for 4-cycle small engine applications. Small Engine Lawn Mower Spark Plug Replacement The Champion RN11YC4 is a go-to spark plug replacement for lawn mowers, riding tractors, garden tillers, and portable generators. Its pre-gapped 0.040 in. setting speeds up installation and reduces tuneup time significantly. OEM Cross-Reference for Major Engine Brands Champion RN11YC4 is a recognized cross-reference replacement for Briggs and Stratton 802592S, Kohler 25 132 13-S, NGK BPR6ES, and Autolite 3924. It is a trusted OEM-grade option stocked by engine dealers and repair shops nationwide. Broad Fitment Across Outdoor Power Equipment Compatible with a wide range of Briggs and Stratton, Kohler Command, Kawasaki FC series, and Tecumseh engines, the RN11YC4 provides broad fitment making it an ideal replacement to keep on hand for seasonal small engine maintenance. Compatible Equipment ▼ The Champion RN11YC4 Copper Plus spark plug is compatible with a broad range of 4-cycle small engines. Equipment running Briggs and Stratton single and twin cylinder engines, Kohler Command CH and CV series, Kawasaki FC420V and FC540V, and Tecumseh OHV engines commonly use the RN11YC4 as a direct replacement plug. Common equipment types and models that use the Champion RN11YC4 include riding lawn mowers, walk-behind mowers, garden tractors, portable generators, tillers, and pressure washers powered by Briggs and Stratton, Kohler, or Kawasaki engines across brands like Husqvarna, Toro, Cub Cadet, John Deere, and Ariens. Briggs and Stratton single-cylinder OHV engines (125cc – 420cc) Briggs and Stratton twin-cylinder Intek and Professional series Kohler Command CH11 – CH25 series engines Kohler CV11 – CV25 overhead valve engines Kawasaki FC420V and FC540V engines Tecumseh OHV engines (OHV110 – OHV130) Husqvarna riding mowers with Briggs or Kohler engines Toro TimeMaster and Recycler mowers with Briggs power Cub Cadet XT1 and XT2 series with Kohler engines John Deere D100 and E100 series with Briggs engines Ariens riding tractors with Kohler Command engines Portable generators (5000W–8000W) with 4-cycle OHV engines Common Questions ▼ Q: What is the gap setting for the Champion RN11YC4 spark plug? A: The Champion RN11YC4 comes pre-gapped from the factory at 0.040 inches (1.02mm), which is the standard gap for most 4-cycle small engines. Always verify the gap against your engine manufacturer's service manual before installation. Q: What engines is the Champion RN11YC4 compatible with? A: The RN11YC4 is compatible with Briggs and Stratton OHV single and twin cylinder engines, Kohler Command CH and CV series, Kawasaki FC420V and FC540V, and Tecumseh OHV engines used in riding mowers, walk-behind mowers, generators, and tillers. Q: What is the NGK or Autolite cross-reference for Champion RN11YC4? A: The Champion RN11YC4 cross-references to NGK BPR6ES and Autolite 3924. It also replaces Briggs and Stratton part 802592S and Kohler part 25 132 13-S in most small engine tuneup applications. Q: How often should I replace the Champion RN11YC4 spark plug in my lawn mower? A: Most small engine manufacturers recommend replacing spark plugs like the Champion RN11YC4 every 100 hours of operation or once per season, whichever comes first. Regular replacement maintains peak ignition performance and fuel efficiency. Genuine OEM Quality   ·   Same-Day Shipping   ·   Expert Support Order the Champion RN11YC4 with confidence — backed by our commitment to quality parts and fast fulfillment.