Briggs & Stratton 796112S Spark Plug Replaces 4220/8025925/796112

What It Is

The Briggs & Stratton 796112S is a direct-replacement spark plug designed for small engines, primarily in lawn mowers, tractors, and generators. It ensures reliable ignition by delivering a consistent spark to the combustion chamber, improving starting and engine performance.

Fitment & Compatibility

Before buying, check your engine’s model number (found on a sticker near the valve cover or muffler). This plug replaces OEM part numbers 4220, 8025925, and 796112, and fits most Briggs & Stratton engines with a 14mm thread diameter, 19mm reach, and 0.030-inch (0.76mm) gap. It’s compatible with many push mowers (e.g., 450e, 500e series), riding mowers (e.g., Intek, Endurance series), and portable generators. Cross-reference with your owner’s manual or online compatibility tool—avoid assuming fit based on brand alone, as deck size or mower model doesn’t determine plug fit.

Key Things to Know

• Quality: OEM-grade copper core with nickel alloy electrode; reliable for standard use, but not for high-performance or extended-life applications (e.g., iridium plugs last longer).
• Installation Difficulty: Easy—requires a 13/16-inch or 5/8-inch spark plug socket. Gap the plug to 0.030-inch with a feeler gauge before installing; pre-gapped plugs may be off.
• Common Gotchas: Over-tightening can crack the insulator or strip threads; torque to 15–20 ft-lbs. Use anti-seize compound on the threads if reinstalling into an aluminum head to prevent seizing.
• Lifespan: Replace every 100 hours or annually; fouling from oil or fuel can shorten life.

Should You Buy It

Yes, if you need a budget-friendly, OEM-spec plug for a standard Briggs & Stratton lawn mower or generator. It’s ideal for routine maintenance where long-life plugs aren’t required—skip it if you want a high-performance or multi-year gap design.