Yamaha TP-7023 User Manual download pdf (Page 5)

NGK’S COPPER CORE TECHNOLOGY

WIDE HEAT RANGE

A wide range spark plug is more flexible and performs equally

well in a hot or cold engine under stop and go city driving or

fast motorway cruising. Engines that tend to run hot need cold

type plugs. Those that run cold demand a hotter type. The

specific plug for any engine is determined by the plug's heat

range. That is the minimum and maximum temperatures

between which the plug will offer optimum performance.

The heat range of NGK Spark Plugs is wider than ordinary

plugs therefore they are suitable for both high speed and low

speed driving. Compared with conventional plugs of the same

pre-ignition rating they have more resistance to fouling.

Compared to ordinary plugs with equal anti-fouling resistance,

NGK Spark Plugs have a higher pre-ignition rating.

NGK'S HEART OF COPPER

Copper wire used in place of the iron core in conventional

plugs is the secret of NGK's Wide Heat Range. Copper's

superior heat conductivity dissipates heat quicker. It cools the

electrode tip and insulator tip which prevents hot spots that

could cause pre-ignition. Increased heat resistance does not

affect fouling resistance, which is primarily determined by the

insulator nose length. The longer the nose, the more

susceptible it is to heat and the more free from fouling. By

raising the pre-ignition rating with the high conduction copper

and leaving the insulator nose long, NGK produces the Wide

Range Plug. One that meets the broad thermal requirements of

engines under high and low RPM conditions. With the

exception of a couple of older applications all the spark plugs

in this motorcycle catalogue employ copper core technology.

FIRING END APPEARANCE

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Yamaha TP-7023 User Manual Page 5