Check the plug type printed on your old plug, and its thread and reach, before ordering. L7T is a common size but it is not the right plug for every machine on this list — the machine's manual is the reliable source.
Aftermarket part. The model names are used only to identify the machines this plug size is used in.
Set the electrode gap to the figure in your machine's manual before fitting.
Do not over-tighten a spark plug in an aluminium head.
Safety
Let the engine cool before removing a plug.
Disconnect the plug lead before working on any petrol machine.
