A friend of mine tryed some of this stuff in his old Triumph and thought it made a difference cleaning out the carbs. My 03 F650 sat for 6 years and got a total of 400 miles riden in that time. Now it runs OK since I just bought it but I find that when its hot, and I go to start it up, alot of the times it will give me a pop back up through the carb just befor it starts up. And thats with a new iridium NGK in place. Any thoughts?