If your equipment is not starting easily or running smoothly, a worn or incorrect spark plug might be the issue.
In this guide, we’ll explore the MTD spark plug cross-reference chart and help you find the right replacement plug for your engine. The chart includes popular MTD OEM part numbers and their equivalent spark plug models from brands like NGK, Champion, and Bosch.
MTD Spark Plug Cross Reference Chart
| MTD OEM Plug | Engine Type / Equipment | NGK Equivalent | Champion Equivalent | Bosch Equivalent |
|---|---|---|---|---|
| 951-10292 | 208cc OHV Snow Engine | BPMR7A | RC12YC | WSR6F |
| 951-10292A | 179cc / 208cc OHV | BPMR7A | RC12YC | WSR6F |
| 951-10292B | 208cc OHV Winter Engine | BPMR7A | RC12YC | WSR6F |
| 951-10630 | 208cc Vertical Shaft | BPMR6F | CJ8Y | WS5F |
| 951-10794 | 123cc OHV | BR6HS | RJ19LM | W7AC |
| 951-10956 | 196cc OHV | BPR6HS | RN9YC | WR7DC |
| 951-12260 | 420cc OHV | BPR6ES | RN9YC | WR7DC |
| 951-12690 | 208cc OHV Horizontal | BPR6ES | RN9YC | WR7DC |
| 951-12690A | 196cc OHV | BPR6ES | RN9YC | WR7DC |
| 951-14437 | 357cc OHV Snow Engine | BPR5ES | RN11YC4 | WR8DC+ |
| 751-10292 | 208cc OHV | BPMR7A | RC12YC | WSR6F |
| 751-12690 | 196cc OHV | BPR6ES | RN9YC | WR7DC |
| 751-14437 | 277cc OHV Snow Engine | BPR5ES | RN11YC4 | WR8DC+ |
| 951-14396 | 243cc OHV Snow Engine | BPR6ES | RN9YC | WR7DC |
| 951-14422 | 357cc OHV Snow Engine (Updated) | BPR5ES | RN11YC4 | WR8DC+ |
| 751-10794 | 123cc OHV Push Mower | BR6HS | RJ19LM | W7AC |
| 951-11299 | 79cc OHV Compact Engine | BMR6A | CJ8 | WS5F |
| 951-12255 | 208cc OHV Snow Engine (Quiet Series) | BPR6ES | RN9YC | WR7DC |
| 951-14151 | 173cc OHV Lawn Mower | BPR6HS | RN9YC | WR7DC |
| 751-11532 | 277cc Snow Engine | BPR5ES | RN11YC4 | WR8DC+ |
| 751-10777 | 123cc Horizontal Shaft Engine | BR6HS | RJ19LM | W7AC |
| 951-12111 | 179cc OHV Snow Engine | BPMR7A | RC12YC | WSR6F |
| 951-11124 | 196cc OHV Generator | BPR6ES | RN9YC | WR7DC |
| 759-3336 | 139cc OHV Lawn Mower | BKR5E | RC12YC | FR8DC |
| 753-05784 | 140cc OHV Push Mower | – | RDZ4H | – |
| 794-00043 | 140cc OHV Mower | – | RDZ4H | – |
| 794-00082 | 140cc OHV Vertical Shaft | – | RDZ4H | – |
| 794-00055A | 123cc OHV Compact Mower | BMR6F | RDJ7J | – |
| 753-06847 | 123cc OHV Small Engine | BMR6F | RDJ7J | – |
| 753-06193 | 123cc OHV Horizontal Shaft | BMR6F | RDJ7J | – |
| 951-15245 | 270cc OHV Snow Engine | BPR5ES | RN11YC4 | WR8DC+ |
| 951-14629 | 250cc OHV Snow Engine | BPR6ES | RN9YC | WR7DC |
| 951-14026 | 163cc OHV Lawn Mower | BPR6HS | RN9YC | WR7DC |
Note:
The NGK BPMR7A and BPR6ES are two of the most commonly used spark plugs in MTD engines.
Always verify thread size, heat range, and gap before replacing.
The Champion RC12YC and RN9YC are reliable replacements found in many local parts stores.
For Bosch users, ensure WR7DC or WR8DC+ matches thread reach and design.
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How to Identify the Right Spark Plug
Here’s how to identify or cross-check your MTD spark plug:
- Check the Engine Model: Look on the engine shroud or frame for your engine number.
- Refer to the Owner’s Manual: It lists the OEM part number and specifications.
- Use the Chart Above: Find your MTD plug and locate the matching NGK, Champion, or Bosch alternative.
- Verify Plug Specs: Confirm thread diameter, reach, heat range, and gap setting.
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Common Spark Plug Brands Used in MTD Equipment
- NGK: Known for reliability and long service life. Ideal for both hot and cold weather use.
- Champion: Popular in small engines and known for easy starts and corrosion resistance.
- Bosch: Often used in European equipment but cross-compatible with many U.S. brands.
Each brand has a unique code system, so cross-reference charts like the one above are essential for finding the correct match.
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Signs It’s Time to Replace Your Spark Plug
You should inspect or replace your MTD spark plug if:
- The engine is hard to start
- There’s reduced engine power
- The engine misfires or surges
- You notice poor fuel economy
- The plug looks blackened, fouled, or has a worn electrode
Regular maintenance suggests spark plugs should be checked every season and replaced after about 25–50 hours of use, depending on the model.
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Tips for Installing Spark Plugs in MTD Equipment
- Always start threading by hand to avoid stripping the threads.
- Use a torque wrench to tighten to specification (usually 15–20 ft-lbs for small engines).
- Set the correct gap using a feeler gauge (check the engine manual for gap specs).
- Don’t overtighten, doing so can damage the engine head.
