MCX 260 Air Fuel Ratio

Sometimes I do but the stumble is mainly between 3 to 6/7000 rpm and is most noticeable in the lower part of that range. Throttle is crisp and clean up to about 3000 RPM.
Cruising is mainly 13/13.5 WOT is upper 11's low 12's.
You are right though it really is not an issue it's just that I know it's there, probably most wouldn't notice.
If I get back in to the map I will maybe try a little richer cruising AFR's
 
Try adding fuel for that RPMs and the higher throttle positions, 60-80% throttle area. May help by adding more fuel faster when you open the throttle fast.
 


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