Having rebuilt a 43f and a couple of 600e's (a 3tb and 4pt) I would suspect cam timing is out a tooth. When I replace can chains I have , from bitter experience on the 43f , also changed the cam drive 'wheel' as they wear as well especially if a worn chain has been clattering around in there. Also I have found the timing marks on the later bikes can be challenging to see. The only real way to check is as was suggested earlier, to st the engine up at the timing Mark and then pull the cam cover off and see if the 2 dots on the camshaft wheel are perfectly parallel with the top of the head. It just seems like a bit of a coincidence that they changed the cam chain and now you have carb issues. Not saying it can't happen but check that timing set up. Good luck !
Mark
43f kicker
Bmw r80
Bonneville
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