Ignition system

The vavles stems were bent on my Kawasaki 1980 Z250 G1 and a spring broke when removing them.
for less than the cost of replacement parts I brought a cheap running 1981 Z250 engine off ebay.

After I excitedly mounted the new egnine I realised they actually have a completley differnt ignition set up.
The 1980 uses a contact breaker ignigtion system the 1981 use a Transistor ignition system.
So normally I'd just plug the contact breaker lead into the coil but this wire isn't there...

On the bottom end the 1990 has the wires cut and unused,the 1981 these are there with the plug.
image of the bike as it's not exactly standard, I really wish I had a kick start on it right now...

Is there any way to rewire this to make it work? Cheaper and nastier the better...

Have you looked to see if the points plate from the '80 can be transfered to the '81? I don't know about yours specifically. I do know that alot of older bikes were made with all the points mounting places still in place when they went over to electronic ignitions because it was cheaper to make them that way than re-tool the production line.

Just had a look, as that sounded a great simple solution.
The plate would fit by the looks but the camshaft is a differnt set up with
No pin for the timing advancer to connect with unfortunatley.

I see what you mean. I suppose you could use the '80 cam in the '81 engine if the bearing diameters match up???