I actually found and repaired the issue.Same condition and location on three TCI units. Break in the circuit board copper band.looks to be heat and age.opened up the back on two of them and transistors and diodes seem to test good.The two zener diodes will test bad untill you remove them.Question I have is there seems to be two types of boxes.One with a label the other with out.The one with a label has a jumper wire on the board and row less of resistors.Any idea which is early or late production? any difference in performance? Have most of you cut the yellow rev limiter wire to the TCI box?
auto, that is great news, I spent some time trying to repair one of these, replace a bunch of parts but never got
the rear cylinder sparking again, I eventually replaced it with an ignitech unit.
however, I and probably a few of the other guys would be interested in what you found, maybe some pictures if you can swing it.
thanks!
-Ron
to answer your question, yes on cutting the rev limiter, it's one of the first things the guys do when
the bike has running problems.