back now... the problem still there.
Eliminated the plugs. They are brand new and correctly gapped. The HT caps are all perfect now.
It only happens when I really 'open' the throttle up - im thinking carbs now... dirty - not enough fuel when fully wound up. Will strip them down and clean it all out.
damit... dam tank is a pain to take off... and the airbox... well thats a hours work just there!
...timing? yes I can hear its out, as well as feel it.. put fingers lightly on the chain cover on the head and give it a rev. But thats tomorrows job!

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