ORIGINAL: COM
Back in 97 Wow that sounds strange! I don't think the CH units came with timing control. I think it was a separate unit. If you have a synchrospark from back then it may be the mark I.
I just picked up an as new Syncro Spark unit for my saito FA 91 on RCG.
Note the date scribed on the back of the unit 12-97.
This unit is about 2/3 the size of the unit I purchsed for my FA 150 back in '97. That unit is scribed W/a date of 5-97.
The unit from RCG was on an engine mounted in an airframe "under construction". It had never been used.
Here is the listing from RCG.
http://www.rcgroups.com/forums/showthread.php?t=1616177
The unit mounted right up to my FA 91 & it made good, hot spark when I passed the magnet over the hall sensor.