Quote:
Originally Posted by rollo22
Roger,
Found this
Older engines
Using a platinum or iridium spark plug in an older engine may lead to the fouling of the plug rather rapidly because the plug is too cold to burn off any excess fuel and oil that get into the combustion chambers of the engine. Burning off extra fuel and oil is what the hotter copper core spark plugs did very well.
Duncan
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Yep I completely agree with that!!
In my experience (I’ve used them once in my carby 900) they didn’t get hot enough and went sooty pretty quickly- not to the point of causing it to run rough but I don’t think the larger gap Iridium plugs needs helps on older ignition systems either.
It may be better on fuel injected motors but personally I wouldn’t use them again.