81 Kz750 ltd no spark

Ok guys sorry been crazy at work finally got back to the garage. So either im a idiot or was way to tired to be in the garage figured out that one coil is making spark helps when you pull the right plugs from different coils not the same. I have new coils coming should I replace both of them?  Second thing I was trying to do what f64 was talking about but got confused with the black prob placement. I love this group so much you guys are so amazing and thank you 

Hehe,
So it's fixed?
Yeah, my instructions can be pretty confusing.
The stock coils can last awhile.
But if you have two new coils coming, you may as well throw both of them in.

Not sure going to try and switch coils around today to make sure its just a bad coil im really hoping so and new ones will be here sometime next  week but then probably have to take carbs off again noticed that all hut one cylinder was not getting gas so must have missed something on rebuild so going to double check them so hopefully next week can bring it back to life. 

Ok stupid question finally got some time to get in the garage again and got.the new coils only took a week to get here. Took the on that was not firing off and found a lot of rust on the two post that connect to bracket could that have caused it to fail?  Is it something I should be concerned of for future? Thanks guys 

Good question, I think not, let’s see what the experts say. I’m sure the windings are isolated from the mounts. The coil is grounded and charged by the points or pickups = dwell.  

Im thinking the same thing but kinda wanted to check and see. Had to go find new hardware destroyed one pretty good trying to get it off and noticed both of them had a slight warp in them so figured fix it right 

The primary and secondary coil wiring are isolated from the metal core, so a little rust on the outside surface didn´t harm the function.
The metal core is for routing and amplify the magnetic field lines.

Ok new coils in and 1 and 4 still no spark . Guess back to the drawing board 

Ok got spark on 1&4 finally came down to tracing almost every wire and found one that was out just a little bit out of the 4 wire going to the pickup  coils and a couple that had a lot of corrosion on them. Thanks to F64 with the diagram and testing procedure this was a nightmare and pain really appreciate all the help guys and knowledge gaining from here. Now to try and get it fired up and carbs all synced up 

Good to hear!
Electrical issues take the longest to suss out.
Mechanical is not as bad.
keep at it!