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Had a look at the service manual last night with all this talk about spark plug gap ; OE is 0.6mm
I ordered some new Iridium plugs, preset to 0.8mm gap ; not too sure if I need to re-gap to 0.9mm/1mm
It appears it is a common issue people have with them , rear plug gets carbon deposits / fouls ; they run rich from factory , not too sure if you do anything to improve combustion
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