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KenBolton · 10-30-2020, 04:18 PM

Had a surprise when I removed all four spark plugs for exterior cleanup. Numbers 1 and 2 looked great. Number 3 had some soot and 4 had a lot. Motor has around 3,000 miles on it since overhaul and runs great. Newly rebuilt carb. I have had two exhaust manifolds fail. I would think if the manifold issues caused shooting it would have cleaned up quickly. I run the needle valve quite lean. Any ideas on what the is causing the shooting?

10-30-2020, 04:18 PM	#1
KenBolton Senior Member Join Date: Jun 2020 Location: Fall Creek, WI Posts: 213	Sooty Spark Plugs Had a surprise when I removed all four spark plugs for exterior cleanup. Numbers 1 and 2 looked great. Number 3 had some soot and 4 had a lot. Motor has around 3,000 miles on it since overhaul and runs great. Newly rebuilt carb. I have had two exhaust manifolds fail. I would think if the manifold issues caused shooting it would have cleaned up quickly. I run the needle valve quite lean. Any ideas on what the is causing the shooting?