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AFR Bung Placement on 4-2-1 Exhaust 444-544

posted by  MrV on  Tue May 24 15:29 CST 2022
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

I have one on the combined exhaust (I have the single outlet manifold). I use it to tune the twin SU carbs but to be honest, I get more out of the spark plug colors. When just lean enough to turn the spark plugs light tan, the AFR seems to run around 11 at idle and 13 at cruise. I have the digital read out plus LED's around the edge like Ron's article references.
dean






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