no spark on 2 & 3

[schmmt]

NO spark on 2 and 3 any ideas? (1981 GS750L) just figured out the carbs, now this!

[DaveDanger]

I'm not intimately familiar with the 750 setup, but I know on the Zuki 4's... the coils fire the plugs in pairs. One coil fires #1 & 4 plugs, and the other coil fires #2 & 3. It sounds like you've got no output from the coil to that pair of plugs. Possibly a coil problem, possibly just a wiring issue to that coil, or the igniter itself. Swap the coils physically, and see if the problem stays on the same plugs or switches. If it stays in the same place, the coils aren't the problem, and you can backtrack into the wiring. In the same logic, if the problem switches to the #1 & 4 plugs, your coil is bad.

[odl777]

could also be your ignition, check to see if the points are firing, or switch your electronic ign wires and if it switches plugs wires it is your ignt.

[schmmt]

got it. the little orange wire going into the front side of the coil (opposite the side that the plug wires come out) was broken off. soldered it back on, all is good!
thanks again!