Thanks Speedy, Norm, Nath, great advice, you blokes are the best.

I did as suggested and tried the spark plug on the engine body and in the run position and it sparks. I also tried in the stop position and it doesn't spark so I must have put the wires in correctly.

As Norm says its pretty Mickey Mouse. I'm no engineer but it must have added in a few cents to put in a proper switch and might have resulted in an extra cable or additional switch mouth or something. Seems pretty amateur solution.

Yeah good point Nath about moving it with the cap off.

Thanks as always