I'll break this open because I may be the only one with pictures. Without pictures nothing here is believable.
This ignition mod. was turboguzzi's idea on his CB500 racer. He suggested I try it when the ignition I was using on mine failed for the second time. It's a simple transistorised system and as TG stated "if it's good enough for those bikes"... Suzuki used similar set-ups on several GSXR model years. There are single vs double pick-ups, but the ignitor units were different according to total advance, how the advance was fed, rev limits, etc. Suzuki doesn't advertise much about those differences, it's a bolt on, no adjustment system on those bikes. To TG & I it didn't matter a damn because the bikes aren't out there idling much. However we both needed to experiment with full advance settings for maximum power, so some adjustment was necessary. Therefore the stock Honda ign. plate was used and the Suzuki pick-up (s) are mounted on the inside of the plate because the signal rotor is short.
TG has experience with GSXR's and can enlighten more, so I won't (and am unable to) explain anything more than what I managed. This unit is from a 1989 GSX1100F (Katana). It's a single pickup and the built in rev limit is 11,100rpm, good for my needs. The signal rotors magically fits perfectly inside the Honda crankshaft recess but I had to enlarge the crank locating pin hole and find a suitable hardened pin to use. I had to machine some off the inside face of the rotor to perfectly align the rotor with the pickup once it was attached. The pickup needed some massaging as well to get the proper airgap I wanted. Obviously the plate needed some work too.
Again, I was only concerned with full advance settings and that happens to be 28-29 degrees. Naturally there are no timing marks and this will likely be a concern for most. I have a small 6" degree wheel I can mount securely on the left end of the crank and set to true TDC with a piston stop. Then I simply run the bike and use a timing light to set the ignition plate for 28d and Bob's your uncle! I made a couple marks so the plate can be set "statically" for start up, then I use the degree wheel. This is a nuisance but there is nothing stock about any of this. I suppose the timing could be set statically too, not sure what TG did here.
There is a third ground wire from the ign plate otherwise two wires to the ignitor box. Wiring the box is simple,
1) 12V power in
2) one wire to each coil
3) a tach wire that didn't seem to drive my Krober?
4) Ground wire
I use Dyna 3ohm coils but regardless it doesn't matter. I emailed TG to add his knowledge on the topic. I'm very happy, but honestly it's not exactly a "plug n play" system change. Timing might be an issue but certainly possible. Remember on the Suzuki's there was no adjustment necessary, so get it right and leave it.
