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Iridium tipped spark plugs

Iridiums are actually sorta overkill as they are the official 100,000 mile plug and what of these goes that long?

As well, they don't fit that well with the waste spark ignition, 2 out of the 4 plugs are firing backwards and no iridium on that end of the plug so high plug wear still happens. Why double platinum plugs were invented for cars that began using waste spark but none known of for bikes I'm thinking.
 
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