I'm cheap and I'm lazy, so the first thing I would do is replace the spark plugs. Then I would check the ignition timing to see if it advances correctly. After that I would check the valve clearances. If it still didn't run right, I would check for vacuum leaks before checking fuel.
Then I would check the air filter, fuel filter, and fuel pump (if your's uses one). With a V, the carbs shouldn't be too hard to get to. Try lifting up on the needle piston with your finger. It should go up with just a little resistance and come back down smoothly. If not, you have to take off the carbs, take off the tops and clean the piston, walls, and passages. Then take off the float chamber and clean all the jets. Set the float level and put it all together.