Hi,
I put a Boyer Micro system on my CB650Z. I found that if you set it up as per instructions, ie, set the timing to full advance at 4000 revs it was a bit revy. So I simply timed as per contact points, ie, at the F mark on the flywheel and I had no further problems. The bike ran well and was quite torquey compared to the original electronic system.
If you set the timing at the F mark and you are still getting revs make sure that the push pull throttle is correctly adjusted as this can cause revving to occur. Make sure there is enough slack on the 'push' cable.