For smooth and efficient running, your John Deere's spark plug must be maintained. To complete the following steps you will need a wrench with spark plug socket and feeler gauge.
- make sure engine is cool and key is removed
- remove spark plug wire
- use spark plug socket to remove spark plug
- discard foul plug and install a new one (if dirty, cracked, and/or broken)
- use operator's manual to adjust new plug gap
- tighten the spark plug in place and reattach the spark plug wire