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Spark plug reading

This detailed article by Mike Canter is more about automotive spark plugs but it also applies to small engines.

Pilots should not change their spark plug type from the manufacturer's specification.

Remember:  The gap must be correct for the plug to do its job.  If your Top 80 sputters/stalls/cuts-out at full throttle, it may be a faulty spark plug or a failed secondary wire.

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