Parts Reference
Spark Plug Cross-Reference Guide (NGK, Champion, Autolite, Bosch)
Spark plug cross-references between NGK, Champion, Autolite, and Bosch part numbering systems, organized by application. If your mower, chainsaw, or trimmer won’t start or runs rough, a fouled or worn spark plug is one of the first things to rule out.
| NGK | Champion | Autolite | Bosch | Application |
|---|---|---|---|---|
| BPR6ES | RN9YC | 3924 | WR7DC | Small Engine |
| BPR5ES | RN12YC | 3922 | WR8DC | Lawn Mower |
| BPMR7A | RCJ8 | 4554 | WSR6F | Chainsaw/Trimmer |
| CMR6H | RCJ6Y | 4092 | WSR5F | Small Engine |
| BKR5E | RC12YC | 3910 | FR7DC | Automotive/Small |
| CR7HSA | None | XST1 | None | ATV/Motorcycle |
| BPMR6A | RDJ7J | 4626 | WSR6F | Handheld Equipment |
| BPR4ES | RN14YC | 458 | WR9DC | Industrial |
| RC12YC | RN9YC | 3924 | WR7DC | Kohler Engines |
| RCJ8 | BPMR7A | 4554 | WSR6F | Briggs Small |
| RN12YC | BPR5ES | 3922 | WR8DC | Kohler/Briggs |
| RCJ6Y | CMR6H | 4092 | WSR5F | Tecumseh |
| J19LM | RJ19LM | 2974 | W8AC | Briggs Quantum |
| RC12YXC | RN9YC | 3924 | WR7DC | Kohler Pro |
| RJ19LM | J19LM | 2974 | W8AC | Briggs L-Head |
| M805853 | None | None | None | John Deere Kawasaki |
Need a definitive answer for your exact model? Ask our AI — verified against OEM data and live Google Search, with a confidence score on every answer.
Try Small Engine AI Free →