Jeff, that is good news. If you were able to use excel version 7 to edit the graphical curve, that is what I was trying to do also. I couldn't get any of the points to move by clicking and dragging to a new position. Program probably has to be changed there to make easier edits. I'm trying to retain the starting points and just edit past the 1000 rpm point. Starting degrees have worked great for me, but the rest needed to be set for a nearly linear advance up max rpm starting around 3500 - 4000 rpm. Depends on individual engine running characteristics, but a universal curve for all engines is what we need. So if it works for that fussy OS 40 you are using, it should work on most others. The curve I sent you in the chip was tested here on a freshly rebuilt K&B 61 with good transition and excellent starting characteristics. When you get it finalized, we'll need some sort of a tutorial on making changes that anyone can do.

I received some etch files from a new member, Rahul Bisht, for his design board for a CDI working on small ATV's with 2cylinder 4 strokes. Board design is good, slightly larger than mine at 65mm x 50mm but includes the advance timer also. When he sends me a viewable parts overlay, I'll post his files. Right now, I have 2 versions... A CDI and a TCI. Both are designed to be used on either scooters or ATV's. I will start a new thread for his designs, since he has many things to share.

John