Carburetor problems?

[shimek34]

Last summer when riding I experienced problems after about an hour of riding. An hour into riding it would all of the sudden stall and die. If I let it sit for a while eventually I could start it back up and it would be fine. I was riding on the highway so I wouldn't suspect overheating. But it would almost stall out like if it was out of gas, except for the fact that it wasn't. I was wondering if it could be something wrong with a carb valve not opening up after it warms up type of thing. I know the carbs probably need to be cleaned out and rebuilt anyways, but don't know if this will get rid of the problem or if I should be looking into another cause.