Honda Goldwing GL1800/A Owner's Manual page 149

Spark Plugs
5. With the plug washers attached, thread the spark plugs in by hand to prevent
cross-threading.
6. Tighten each spark plug:
Improperly tightened spark plugs can damage the engine. If a plug is too loose,
a piston may be damaged. If a plug is too tight, the threads may be damaged.
7. Reinstall the spark plug caps. Take care to avoid pinching any cables or wires.
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1/8-1/4 turn after it seats (if the old plug is good)
1/2 turn after it seats (if installing a new plug)
Servicing Your Honda
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