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BF90A 2006 Question about spark plugs

C

C-Dory

New member
I serviced my engine with the recommended plugs NGK DR7EA . Gap is 0.7mm. The old plugs had a weird burn pattern. I’ve numbered them from top down, 1, 2, 3, and 4. The top and bottom plugs, 1 & 4, looked ok but the two middle plugs, 2 & 3, were very burnt or dark. Does anyone have an idea what could cause this and how to fix?

Thank you!!!

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Hi,
Looks to me like those two cylinders may have been running a little rich. Not sure what might have caused that though. You could check valve adjustment. Maybe check compression.
If that's good then I might wonder about those two injectors maybe being a bit worn.
But that doesn't look drastic or like anything to get too worried about to me.
Just my opinion.
 
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