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Grand - main jet through the bore, 4 cross bore holes through the emulsion tube (learned something there!) and the main jet at are all visibly clear or were poked with fuse wire. What is the principle of the governer spring, is its movement dictated by engine speed somehow ?

Do you mean these?

Thanks both - took apart the carb again and cleaned it out - didn't see too much wrong but I did get a puff of something when I put the airline on the main jet. Reassembled and we have a runner! Am not entirely sure what I'm at with trying to tune an idle, think I have something half passable...

Very long shot given the age of the thread, but here's hoping. I have a Mountfield Empress with Tecumseh Bvs143 /Dellorto carb combo identical to the original poster. Bought for peanuts as a non runner as a bit of a project. Got it home and stripped the crap out of the carb and diagnosed non...