Are Machine Mart / Clarkes paying for the plug and your time / fuel driving round? If not, I wouldn't waste any more time looking at it, or spend any money on it, or waste any milage fetching a plug, Just take it back. You shouldn't need to be fixing the manufacturers problem on this.
Your new plug will also soot up if the mixture is wrong and nothing is done..
You could be spending money, wasting time, and achieve nothing ...
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