| Can't disagree with Kev. Ignitech are ok, but you did need to be technically savvy in setting them up. I looked at the system quite closely for my TT2 Pantah (pretty much an early 600ss) and read one of Brad Black's (Brad Bike Boy) excellent articles, where he covers fitting and using the Ignitech.
I ended up going with a complete Silent Hektik Powerblock system, modifying the 600ss one to fit an earlier Pantah. This system comes with a lightweight rotor; single pickup/trigger; coils; leads; ignition box. It has 16 selectable pre determined ignition curves and is very well made. About £350 at current exchange rates, but you're getting everything!
I guess my point is, that you may end up replacing the boxes, then the coils, then the pickups, etc, in which case the SH system pans out pretty well.
Only thing is, I'm not sure that the rules allow you to fit the lighter rotor? | 
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