I have a '95 750. When I ride about 65 miles into a full tank of gas the bike reacts as if it needs to be put onto reserve. I have plenty of gas and it usually starts back up after stalling. I've taken the fuel valve out and cleaned it and replaced the filters. I've been told it may have something to do with vacuum or the weight of fuel pushing gas to the carbs, but when it gets lighter, due to 65 miles having been ridden, the weight of the fuel is less so it doesn't get tot he carbs as well. I know it sounds crazy, but I'm open to any ideas. Please help.