1. Remove the ignition module (see Removal and installation of the ignition module).
2. Blow out the spark plug wells with compressed air to prevent dirt from entering the engine cylinder when the spark plug is removed.
3. Remove spark plug..
4.... and remove it from the candle well.
Note. Inspect the candle and evaluate its condition by appearance (see Diagnostics of the engine condition by the appearance of spark plugs).
5. Check the gap between the spark plug electrodes with a round feeler gauge. It should be 1.0–1.1 mm.
6. If the gap is not correct, adjust it by bending the side electrode.
Attention! Adjust the gap only by bending the side electrode. Any bending of the center electrode will break the spark plug insulator.
7. When installing spark plugs, screw them in first by hand (without collar), and then tighten with a wrench.
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