I am at the end of my rope, because this is the only thing in intake I did not mess with (OK, primer, but that should not blow the connector lines off) - and I am pretty confident in the carbs.
Stupid saga continues. Looks like someone has been messing with reeds, because one of the shims is missing. I wonder if they have already been flipped, because the tip seems to lie flat against the reed block, but the mid-section shows a gap.
By way of an update, replaced reeds with Boyesens (and also replaced primer gasket). That cured most of the problems described here. Smoke is down to acceptable levels.
