You can certainly change the fuel filter (its right under the left side of the fuel tank) for a few dollars, get a bottle of Seafoam from Walmart (about $9) and put 5 ounces in a full tank of gas, and while you are at it, look at your air filter. If its not white like paper get a new one (an OEM air filter is about $25).
if you want to save some money, get all your stuff from an online suppler, like BikeBandit or Revzilla. While you are there get 4 or 6 spark plugs (they are about $2 each) and replace your plugs.
If you do all that, and run the full take of gas with seafoam through the carbs, and you are still having issues, then you might need to consider taking the carbs off to clean them.
In general you should never need to clean the carbs on a motorcycle, if the bike is properly prepared for storage, but there is a certain point where it will not run well enough for a fuel treatment to do any good.
Once the jets or PMS are clogged, nothing is going to flow thru them to clean them out.
One other thing to check - make sure fuel is not running down the right side of the bike when the engine is running - the float overflow tube comes out right between the cylinders on the top of the engine case. If your floats are sticking then gas will overflow. You might be able to fix that with Seafoam in the fuel.
Last edited by KCW; 05-30-2018 at 10:11 AM.