John Deere — Checking Spark Plug

Maintenance · Engine

From a John Deere owner's manual — check it applies to your exact model before use.

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Procedure

1. Park machine safely.
2. Let engine cool.
3. Lift hood.
4. Disconnect spark plug wire(s), one on each side on V-twin engines.
5. Remove spark plug(s).
6. Clean spark plug carefully with a wire brush.
7. Inspect spark plug for cracked porcelain, pitted or damaged electrodes, other wear or damage.
8. Replace spark plug as necessary.
9. Check plug gap with a wire feeler gauge.
10. Install and tighten spark plugs to specifications.
11. Connect spark plug wire(s) and lower hood.

Source: John Deere owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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