10-01-16, 01:58 PM
Well, the carb sync has definitely made the tick-over, low-speed cruising and over-run _a_lot_ smoother.
The bike no longer makes the weird slapping noise where it always used to but it still does it at other times, still while leant over with modest acceleration at low revs. But much less and much quieter when it does. It's not really a rattle, more of a chatter. Probably is the EXUP - the smoother power delivery probably just lessens the tendency for it to start to vibrate. Will have a look at that anyway as the guide makes it look so simple.
Cheers everyone for the pointers.