Thanks for coming to FixYa for advice with your problem. I will give you the best of my expertise to help you get it sorted out.
In short, yes you will have a carbie problem. Nothing to serious, it will be gummed up from being left with old gas in it. Petrol has a short shelf life. It starts to deteriorate almost straight away, and anything more than a couple of months old should be discarded if you want your machine to perform reliable with good performance.
Since you are able to get the bike to start, I would be putting some fuel additive in the fuel and see if you can clear the problem. there are many carbie/injector cleaner additives out there. I use Nulon
, check with your local automotive supplier. The fact that it was performing badly befor estorage may mean there is some **** in either the pilot or idle side of the carb. Spraying carbie cleaner through the carb intake whilst the bike is running may also help.
Try these things first but if that fails, the best solution is to remove and stripdown the carb, and remove and clean all jets and pay particular attention to small passageways/openings. Use an aerosol carbie cleaner to assist you here, a compressor with air gun is also generally required. make sure you can see the carbie cleaner passing through these orifices and passageways. Letting things soak can also assist here.
Happy to talk to you further about your repairs. I have much experience in this field:) A testimonial and rating is a great reward for my advice to you is greatly appreciated. It makes helpijng out worthwhile and gives me a warm fuzzy feeling. Hope you get things sorted easily. Cheers mate