My new B31 breathes - thanks for your help

[Fraz]

So pleased, my non-runner B31 mystically produced a spark today.

Added some fuel and bang, she runs.
Just need a battery, tyres and footrest rubbers.

Hopefully the dynamo and regulator are working.

Thanks for all your suggestions folks

[neil1964]

Excellent news
Stick a bolt meter across the Dynamo and see if you get voltage rise once you get the revs up.
Does your ammeter work ie swing on charge (likely do need battery in circuit. 
You can frig any 6v battery in circuit to test.