Wilmslooooooooooooooooooooooooooooooooooow,
'When starts up, plumes of smoke. After a few minutes, smoke goes and works absolutely perfectly well.
My understanding is that this can only be a sticking valve seal, which should be a very straightforward fix.
'
your understanding or this is what someone told you ?
Might it also be warn rings ? which expand once the engine is warm and therefore don't let anymore oil into the chamber hence the smoke disappearing ala common condition with Gardners
Milan.