1. Be safe. Your engine should be cooled off when you plan to change the spark plug. To begin, disconnect your spark plug wire.
2. Remove the old spark plug by using a spark plug wrench. Check the gap on the new plug - refer to your manual for the correct gap on your mower. Adjust the gap to its proper measurement by using a specialized gap tool or set of feel gauges.
3. Pay careful attention during this step to not cross-thread the new plug. To install, smoothly thread the plug in by hand. This will take a few turns.
4. Tighten the new spark plug with your spark plug wrench. Be sure not to over-tighten.
5. Reconnect the spark plug wire.
If you have any questions about replacing the spark plug or operating your MTD lawn mower, contact a specialist.
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