Thanks for your suggestion... but no thats not the problem Wilco mate..
I had a valve bind up in a guide a couple of weeks ago, it bent the valve..
I had that replaced & the guides re honed, put it all back together & everything was fine
when I rode it last... I fired it up next day to show someone, 1st or 2 kicks & she started,
I shut her down after a minute or 2... Later that day I wanted to go for a ride, started ok,
warmed it up, & it started to misfire, checked plugs, points,fuel, & compression test all's ok..
now it wont start & back fires when kicked over... ( I think the maggy's playing games... )
I've not been able to trace whats going on so will start retracing my steps & pulling her apart next week.
If I cant work it out watch the FOR SALE section.