The Champion RJ17LM is a popular copper-core small engine spark plug used in lawn mowers, ride-on mowers, garden tractors, generators, and other outdoor power equipment. It features a 14 mm thread, 3/8″ (9.5 mm) reach, 13/16″ (21 mm) hex, and a recommended gap of 0.8 mm (0.032″).
Specifications
| Specification | Value |
|---|---|
| Thread Diameter | 14 mm |
| Thread Reach | 9.5 mm (3/8″) |
| Hex Size | 21 mm (13/16″) |
| Seat Type | Gasket / Flat Seat |
| Electrode Type | Copper Core |
| Gap | 0.8 mm (0.032″) |
| Terminal | Solid |
| Projection | Non-projected |
These specifications are consistent across Champion’s RJ17LM and equivalent stock numbers such as Champion 856 and RJ17LM/T10.
Common Cross References
- NGK: BR4LM / B4LM
- Denso: W14LM-U, W14LM-US, W14LMR-US
- Bosch: WR9EC0, WR9E0
- Honda: 98073-54744
- Champion Stock No.: 856, 8561, RJ17LM/T10
Typical Applications
The Champion RJ17LM is commonly found in:
- Older Briggs & Stratton engines
- Selected Tecumseh engines
- Small Honda engines
- Ride-on mowers and lawn tractors
- Generators and other outdoor power equipment
Champion RJ17LM Spark Plug | Copper Core Replacement | NGK BR4LM Equivalent | Lawn Mower & Small Engine Plug
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