Ha....The curse of the A10 strikes again, frustrating your chance of stardom.
Ok, duTch is on the money here, anything that stops that fuel vapour getting to the inlet manifold is suspect, from a blocked tank breather, to a blocked main jet and anything in between. So start with the easy stuff, fuel taps, tank filters, float, needle. Establish fuel is getting to the carb, then move on to jets, internal drillings, sealing washers, correct assembly, air leaks. Good chance its the tank, recent enthusiastic riding has shaken up some sediment....taking the fuel taps out may reveal all! A couple of cheap in line fuel filters are worth fitting, and give visible indication of fuel supply.
Swarfy.