I purchased one of those Argentinean CDI boxes on Ebay

[Bartjan]

its not about the crankshafts position that other cdi dont work, thats the same on all b4s
the 93+ models have a restriction on 5th and 5th gear with extra connectors, so their not interchangeble with pre 93 models
vv models have something special also  

[Kenyan01]

Bartjan,
I agree with you there. V V model and newer (post-92) B4s may have some differences in their ROM that would make it not possible to interchange with older models. But I suppose pre-92 bandits should not have major differences.

Best regards,
Patrick.

[Herr Tod]

As far as I know there are two different types of timing plates (starter clutches), the one with a big notch on which the arrow is placed, and one with a small arrow notch. The small ones are most probably '93 and later models. I've had a '94 starter clutch (small notch) with a '92 CDI, all it did was idle, didn't climb beyond 3500 RPM and would just die if the throttle was touched. Changed the plates and voila, it ran like it's supposed to.