'80 CR250 - No spark! Where to start?

Hi!

Last year I bought a project, that came with a rebuild engine and today I tried to start it for the first time.

It ran for 2-3 seconds then cut out, did that twice, then couldn't restart.

I pulled the plug, but couldn't see any visible spark.

- New plug
- Cut 1cm off HT lead and screwed in the NGK cap again.
- Unplugged killswitch.

Where do I go now for diagnosing?

There's a small connecter on the coil, that sits unused, there's no spade in the loom for that one. What is that for?

Motoplat ignition? Two wires go to the ignition coil one large spade, one smaller spade from the stator. It might be broken in the wire harness, or at the stator.
Mark the stator where it’s set, remove it and look for the missing wire.

3-pole Motoplat ignition

Currently reading this:

http://motoplatrepair.tripod.com/id12.html

I have a thick powdercoat, so no galvanic contact between coil and frame, I'll see to that tomorrow!