Update on Starting.
I changed the plug and with a little start fluid in the air box we have some life, but it's very lumpy and weird. I can also really hear the piston going up/down, maybe that's normal but I wondered what other checks I should do.
A bit of history....
I had it serviced by a shop in Phoenix about 3 years ago. When I collected it the mechanic (nice chap) said that he was not happy about how it was running and he's done the best he could. The basic symptoms were, it started strong and at low rev's everything was hunky dory but when you gave it some gas it jittered and spluttered.
Anyways, I only rode it for about 30mins before (due to life's challenges) it went back into storage.
So now when I can (eventually) start it, it idles just about but when given any gas it stalls (most of the time).
With my limited knowledge it would seems to be a Carb issue and that aftermarket pipe (which I want to ask for advice about changing, it's insanely loud (another post maybe)....the service guy felt like the pipe could be compounding the carb balance (that's above my pay grade to agree/disagree).
My plan is to get it running and in tip top shape, changing out some of the parts to make it more enjoyable to ride (be gone loud pipe) and further enhance the aesthetic.
Small steps. Thanks for the feedback so far, I'm really pleased to be able to share the bike with people who are interested.