794-00055A Spark Plug for Champion RDJ7J MTD 753-06847 753-06193 Bolens BL110 BL125 BL160 Troy Bilt TB22 YN22EC TB32EC TB35EC TB25C TB25CB Trimmer Brushcutter

What It Is

This is a direct replacement spark plug for Champion RDJ7J, designed for small engines in trimmers, brushcutters, and blowers. It provides the ignition spark needed for combustion in 2-cycle and some 4-cycle handheld outdoor power equipment.

Fitment & Compatibility

Before buying, confirm your machine uses a Champion RDJ7J (or equivalent) plug. This plug fits MTD 753-06847 and 753-06193, and models including Bolens BL110, BL125, BL160; Troy-Bilt TB22, TB32EC, TB35EC, TB25C, TB25CB; and other TB-series trimmers/brushcutters with compatible engines. Check your owner’s manual or the old plug’s number. Measure the thread size: 14mm x 1.25mm thread pitch, 19mm reach, and a 13/16” (21mm) hex. It’s a resistor-type plug (suppresses radio interference). This is an aftermarket plug—not OEM, but meets or exceeds OEM specs.

Key Things to Know

• Quality: Solid construction with a copper core electrode for reliable spark and long life. Rated 4.7 stars from 379 reviews.
• Installation: Easy—remove the old plug with a 13/16” socket, gap the new one to 0.025” (0.635mm) if needed, then hand-tighten plus 1/2 turn with a wrench. Don’t overtighten.
• Gotchas: Always check the gap before installing; it may be pre-gapped but can shift in shipping. Use a spark plug gap tool. Also, verify your engine uses a resistor plug—this one is, so it’s fine for most modern trimmers.
• Price: $8.99 is competitive for a quality plug; cheaper than OEM but still reliable.

Should You Buy It

Yes, if you need a dependable, affordable replacement for a Champion RDJ7J in a compatible trimmer, brushcutter, or blower. It’s easy to install, well-reviewed, and saves money over OEM without sacrificing performance.