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Carbon on No. 3 plug

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Roy.honda:
I've checked all the spark plugs. They are all ok. But the No. 3 plug has carboned up dark brown colour. It's not wet. Any ideas?

Johnwebley:
sounds over rich,check float height,needle position,is the main jet in place,are all the other jets corrected and fitted correctly,


 swop the plug to another pot,and see what happens,

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