Briggs & Stratton 496018-2pk Spark Plug (2 Pack) For OHV Engines Replaces 5066K, RC14YC

What It Is

This is a 2-pack of Briggs & Stratton 496018 spark plugs, designed specifically for overhead valve (OHV) engines. It replaces the common RC14YC and 5066K plugs, making it a direct drop-in for most Briggs OHV mowers, tractors, and small engines.

Fitment & Compatibility

What to check before buying:

• Engine type: For Briggs & Stratton OHV engines only (not flathead or side-valve). Look for “OHV” on your engine shroud or model number.
• Gap: Pre-gapped at 0.030 in (0.76 mm), but always verify with a feeler gauge before installing.
• Thread size: 14 mm thread diameter, 3/4 in reach (standard for most Briggs OHV mowers).
• Replaces: OEM numbers 5066K, RC14YC, 496018. Cross-checks with Champion RC12YC, Autolite 3923, and NGK BPR6ES.
• Deck size or brand: Not deck-specific—fits any brand (Cub Cadet, Troy-Bilt, Snapper, etc.) with a compatible Briggs OHV engine.

Pro tip: Check your engine’s model number (stamped on the blower housing or valve cover). If it ends in “OHV” or is a Series 400/500/700/800/900/1000/1100, this plug likely fits.

Key Things to Know

• Quality: OEM-grade copper core plug; reliable for standard use but less durable than iridium or platinum plugs (replace annually or every 100 hours).
• Installation difficulty: Easy—remove old plug with a 5/8 in socket, gap the new one, hand-tighten then 1/2 turn with a wrench. Avoid overtightening (damages threads).
• Common gotcha: Some users report the plug is slightly shorter than some aftermarket options—verify reach by comparing old plug side-by-side. If your engine has a deep recess, this may not seat properly.
• 2-pack value: Cheaper than buying singles, but only if you need two (e.g., twin-cylinder engines or keeping a spare). For single-cylinder mowers, one plug is all you need.

Should You Buy It

Yes, if you have a Briggs OHV engine and want a simple, OEM-spec replacement at a low price. It’s ideal for routine maintenance on push mowers, tractors, and generators where annual plug changes are standard. Skip it if you need a longer-reach plug (e.g., some older flathead engines) or want a premium long-life plug like iridium.