Choose the correct spark plug for your engine and for
the use of the engine. Manufacturers recommend different grades of
plugs per engine. A medium grade plug (B7ES) is good for general use around town, dual carriageway or motorway. A cold plug
(B8ES) will be
required for motorway touring.
Running an engine on a hot plug, flat out on a
motorway would soon pink and overheat. Running an engine
around town on a cold racing plug would cause misfires due to fouling up.
There are various plug types available i.e. NGK (personal
favorite) or Champion for general use and
Nippon Denso for racing.