Hipa 794-00082 Spark Plug for Champion RDZ4H MTD Troy Bilt 753-05255 794-00043 794-00042 753-05784 791-180852B

What It Is

The Hipa 794-00082 is a direct-replacement spark plug for many MTD, Troy-Bilt, and Champion RDZ4H-based lawn mowers, riding mowers, and zero-turn models. It’s a standard copper-core plug meant to replace worn or fouled plugs to restore starting reliability and engine smoothness.

Fitment & Compatibility

Cross-references: Replaces OEM part numbers 794-00082, 794-00043, 794-00042, 753-05255, 753-05784, and 791-180852B. Also fits Champion RDZ4H applications.

What to check before buying:

• Thread size & reach: 14mm thread diameter, 19mm reach (standard for most small engines).
• Gap: Factory pre-gapped, but verify gap is 0.030” (0.76 mm) before installation.
• Brands: Works on MTD, Troy-Bilt, Cub Cadet, Yard Machines, and other brands using Briggs & Stratton or generic 14mm engines.
• Deck size: No deck-size limit—this plugs into the engine, not the deck. Check your engine’s spark plug type in the owner’s manual.
• OEM vs aftermarket: Hipa is an aftermarket brand; quality is consistent but not OEM. If you need a Champion-branded plug, buy the RDZ4H directly.

Key Things to Know

• Installation difficulty: Easy—remove old plug with a 13/16” or 5/8” socket, gap new one to 0.030”, hand-tighten, then ¼ turn with a wrench. Don’t overtighten (can crack the insulator).
• Common gotcha: The plug may arrive with the gap slightly off. Always check with a feeler gauge before installing.
• Durability: Copper-core plugs last about 25–50 hours of typical mowing. If you run heavy-duty or commercial use, consider an iridium plug for longer life.
• Performance: Restores smooth idle and easy starts, but won’t boost power or fuel economy beyond factory specs.

Should You Buy It

If you need a reliable, low-cost replacement for a 14mm spark plug in an MTD/Troy-Bilt mower and don’t mind aftermarket, this is a solid buy. It’s well-rated, fits many common models, and is easy to install. For commercial mowing or if you prefer OEM, stick with the Champion RDZ4H.