Replacement Ignition? (1979 A1)

On my first A1 I had an isue just after I bought the bike with rough running under 2000rpm.  Turned out to be cracked original coils leaking. The dealer I bought it from put some alternatives on that were similar shape and size but with screw on HT leads and fixed the problem.

Yes, the fault does feel like something intermittent/electrical.
I’m tempted to buy 3 new coils but don’t actually know what to buy.
I’m a bit confused about all the talk of ballasts etc

Opted for
3 coils 
6 plugs
6 caps
6 leads
from wemoto.com

that will eliminate all the obvious I guess, then I’ll have to head down to Baker Street

Steve - have you read this thread from the beginning:
www.kz1300.com/index.php/forum/electrica...-z1300-kz1300-how-to

The AW82 coils seem to be a popular ,reliable and reasonably priced option as replacements for the originals.

Chaps,
I’ve received my 3 new coils etc.
But my new coil terminals don’t have +be or -ve on them …
Does it matter or how do I determine which is which please?
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Interestingly, the bike had 3 different makes/sizes of coil on it and the leads looked pretty tired. Even the wiring was a mix of colours and sizes. All new now of course.

The KZ1300 uses wasted spark ignition coils. The primary winding and the secondary winding are isolated from each other. If you check the resistance between the + and - terminals of the primary you should find around 1.2 - 1.9 ohms. The secondary winding is checked by placing the meter probes in the 2 ignition wire sockets and you should read around 18000 ohms. The final check is between one of the primary terminals and one of the ignition coil sockets. There should be an open circuit since the primary and secondary windings are isolated from each other.
In a standard coil ie. single terminal,  the spark generated by the secondary winding travels from the coil ignition socket through the ignition wire to the center electrode of the sparkplug, across the electrode to the ground electrode, then through the engine block and back to ground. The ground of the engine is also attached to the negative terminal of the ignition coil so this completes the circuit of the "spark" making its way back home. On that type of ignition coil you will find that the secondary coil socket will so a resistance when a ohm meter is applied between the primary winding terminals and the secondary coil socket.
So in an answer to your question - You can think of your primary winding as a filament in a light bulb. It really doesn't matter if the power is transmitted one way or the other through the filament, the bulb functions. Same goes for your ignition coils. There really is no dedicated + - terminals on wasted spark coils.