Yamaha TP-7023 User Manual download pdf (Page 6)

THE BEST SPARK PLUG FOR EVERY OCCASION

As a result of our policy of continuous research and development NGK can offer special spark plugs designed

to give optimum performance under a high range of conditions.

‘S’ TYPE (e.g. BP6ES)

NGK standard spark plugs with copper cored centre electrodes for wide heat range.

Copper’s superior heat conductivity dissipates the heat of combustion away from the firing

end, preventing hot spots that can lead to pre-ignition. Copper cored electrodes also mean

that longer insulator noses can be used to protect against fouling.

‘G’ TYPE (e.g. B10EG)

These plugs feature a smaller diameter centre electrode tip made of conventional nickel

alloy. The smaller diameter centre electrode means the voltage required to produce a

spark is reduced. However as the tip is made of conventional nickel alloy the service life

is reduced and these plugs are best used in applications where plugs are frequently

changed.

‘V’ TYPE (e.g. B10EV)

The centre electrode of this type is made of gold palladium alloy and is even smaller in

diameter than the G type at 1.0mm and has therefore an even lower voltage

requirement. These ‘V’ types have now been discontinued and replaced with ‘VX’ or ‘IX’

equivalents.

‘GV’ TYPE (e.g. B9EGV)

These plugs have a centre electrode of precious metal similar to the V range. In addition

the insulator nose is an improved design to allow better gas flow around the firing end.

The ground electrode is shorter and stronger, making the GV range more suited for

racing applications.

‘VX’ TYPE (e.g. B8EVX)

These plugs have an even smaller centre electrode (0.8mm) than the V types and this is

made of platinum. This combined with a taper cut ground electrode means an even

lower required voltage than the V types. The result is better ignitability along with

improved starting, idle stability and anti-fouling performance.

‘IX’ TYPE (e.g. BR8EIX)

Similar in design to the Platinum VX spark plug, the use of the precious metal Iridium

allows us to manufacture a spark plug with an even smaller diameter centre electrode

(0.6mm) without compromising durability. This extremely small Iridium tip centre

electrode concentrates the available electrical energy and combined with the taper cut

ground electrode provides the best performance in terms of starting, idling and

especially throttle response.

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Yamaha TP-7023 User Manual Page 6