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Patrick L. · 10-29-2019, 08:10 AM

Sounds as though it is running rich or there is a problem with the sparklers themselves.
What plugs are you using ? If you're still using the 3x then you may need hotter ones.
How is the carburetor being adjusted ? The low speed adjustment is air not fuel. Where is the GAV set ?

10-29-2019, 08:10 AM	#2
Patrick L. Senior Member Join Date: May 2010 Location: Largo Florida Posts: 7,225	Re: 4 Blackened Spark Plugs? Sounds as though it is running rich or there is a problem with the sparklers themselves. What plugs are you using ? If you're still using the 3x then you may need hotter ones. How is the carburetor being adjusted ? The low speed adjustment is air not fuel. Where is the GAV set ?