If it was running fine , then highly unlikely you will need carb parts , yes parts are hard to find , but if you look after your machine , it should see your lifetime out……they’re that well built.
Yes , it’s worth a call , EG COLES in Dorset used to do some Kubota spares ,so maybe they’re worth a call also , as well as Small Plant and Garden Spares.
If yours has just failed through duff electrical components , they’re very easy do do yourself , I’m now in the process of doing one myself , new coil/condenser and points , and it will see my lifetime and the next persons out.