what is difference between tci's

hi guys, i have an '84 xj750r import (same shape and model as the 900r)
soon to have the 891cc transplant. not so long ago i was having a few issues with spark so started tooling around with all the different electricals.
i now have a collection of xj's 2 750's and 2 900's and always on the lookout for more (when she who must be obeyed isn't looking).
what i found was that changing the different tci's from one bike to another didn't seem to make that much difference to the bike. so i am wondering why the different part no's to the same part on different models. do they have a different spark curve/duration, power output, what?.
none of the books or cd's i have note any differing no's to these tci's but they all run my bike with out any drama's
even the way they are tested with an ohm meter gives the same answer.
this may be one for the electronic gurues out there

 

You are correct. The ignition is controlled electronically, rather than have some mechanical device for advance/retard. There will be differences between the models but it's generally accepted (Here) that you can swap TCI's between bikes to test them although the correct one should give you the best performance.

Robert, on this site, repairs them.