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Hi Weld, actually I was saying that the air/fuel ratio was running a little lean between 8-9K rpm. Nothing alarming and I am pleased with the results. My concern was when I saw the header pipe bluing, and was afraid of a lean condition. The dyno graph demonstrates that me fears were unfounded.
There's some that say that richening the mixture to about 12.5-12.8:1 ratio can result in more power. Not sure how much power one can expect from a change in the A/F ratio. But given the engines' excellent reliability, I'm a bit loathe to do much around reciprocating assembly changes and any kind of drastic changes to air fuel ratio.
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