I think I'm in love with my ultrasonic cleaner 😁 It's full of carburettor parts right now.
When I checked the block over, although it was really dirty on the outside, the inside had clearly been very recently honed.
This is going to be a spare engine which I'll keep wrapped up until I need it - I'm bound to blow up the engine that's in the bike at the moment sooner or later ! I've got a hone, but I'm reluctant to re-hone it and remove more material because that brings the day when it'll need a rebore and new pistons closer. So when I need to put the engine in, I think it'll be okay, but if compression is low or it smokes, I'll get the barrels off and hone it then. Hopefully that makes sense !