RCW, many thanks: I will check as you suggest. I should have added previously that performance higher up the throttle range appears fine, though there's a bit of 'deadness' in response initially. The governor linkage cover has never been off I'd say (rivets appear original). In testing, I backed the governor stop screw off completely and relied on the carb idle screw for adjustment: revs were still too high at the 'fully out' position, but maybe an incorrect method?
The carb's float chamber was very clean when I looked; some further internal investigation may well be necessary when I've eliminated everything else. New territory for me!
I will get some Barrs Leak: good advice.... Your input is much appreciated.
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