XD05F spark plug cover or cap that fits all GL1000, GL1100 and GL1200. Covers testing over 5,00 OHMS should be replaced.
Maintenance schedule: Honda advises replacing spark plugs every 4000 miles or 6400 km.
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Periodically test your spark plug caps with a multi-meter. If the reading greatly exceeds 5,000 ohms, you need to replace your caps.