Hi,
Like I said, don't feel offensive here, it was just an observation from the results on paper you provided.
Maybe primary chain slack, secondary chain slack, maybe something different, but it's there, it's measured and documented.
How do you know it running rich ?, and where precisely is it running rich ?
Why the dip in the midrange ?, what is the torque curve saying about that ?
In general, a simple dyno run, without the torque curve, and without a mixture curve says nothing about the potentials of the engine and should be seen only as an ”as is” curve, and probably that was your intention.
Jensen