Just tested mine with a timing light...the timing mark barely moved as I revved it up. Disappointing, and a bit inconclusive. Might have gained like 5 degrees, between idle and probably 6 to 8k rpm.
Stopped testing because my secondary muffler wouldn't stay on, and I don't need to annoy the neighbors with all that noise.
On the other hand, I also had my tach light out, which I used to set the idle yesterday...hit 11,500 rpm quickly, before I chickened out. That's good...wasn't sure it would do much past the 8k limit the old CDI box.
Self-advancing timing would be nice...lack there of might explain the need for 1500rpm idle?