Don't pay to have the carbs rebuilt. Like I suspected you have a machine screw at the bottom of each carb bowl. Be careful when you take them out they are short fat screws and easy to drop. After you take the screw out a little gas will come out of each carb, you should have a white rag or something to catch it with. If theres debris in there you will be able to see it on the white rag or in a clear container. You can now see your high speed jet and can shoot some carb cleaner through that jet. Sometimes this works, sometimes it doesnt.
Before you do any of this, pull off your air silencer so you can see your carb throats. let the engine idle and see if you can see gas coming out of any of the carbs. If you can see gas its a sure sign that you have some debris in there thats preventing the needle from seating properly in the seat and they will need a rebuild.
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