Definitely an 1981 model.

Checked the bigger photo - yes 1981.
So - I will try that.
I disconnected the ignition module from the spark plug, removed it - and hung on to it - gave it a pull and didn't get a big jolt. No go.
So I will double check the kill wires too. Thanks for the tips.
Anyone got a spare (known working) ignition coil - just in case my checking proves correct?