Yamaha TP-7023 User Manual download pdf (Page 8)

The Iridium IX spark plug is similar in design to the Platinum VX type but benefits from

the use of the precious metal Iridium on its centre electrode. Iridium is harder than other

precious metals used in spark plug manufacture, has an extremely high melting point and

offers greater protection from chemical attack. These features allow the use of an

extremely small diameter electrode (0.6mm) without compromising the spark plug’s

service life. Combined with the use of the taper cut ground electrode this spark plug has

superior gas flow properties and lower voltage requirements, which offers further

improvements in starting, idling and throttle response.

Iridium spark plugs are used by some of the worlds leading race teams and as original

equipment in many high performance road and off road machines. Owners who want

the very best performance from their bikes will want the best spark plug and this we

can offer with Iridium IX.

THE IRIDIUM IX SPARK PLUG

BR8EIX

Iridium IX

packaging

Iridium IX

A small diameter

electrode that gives good

gas flow and less

restriction of flame kernel

The close up section shows the

annular gap between the centre

electrode and insulator nose which

provides cold fouling protection.

Should current try to leak away

across a carbonised insulator a

spark can occur between the

electrode and the insulator thus

burning away the carbon deposit.

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Yamaha TP-7023 User Manual Page 8