14-07-14, 11:06 AM
I had a similar thing after a recent air filter swap where I removed the tank. I'm fairly sure it was because I tightened the horizontal hinge bar at the base of the tank too tight. Loosening it a little helped a lot. I suspect all that rubber mount and washers is there for vibration dampening and isolation. Tightening the lot up too much will just couple the tank too tight and just transfer vibrations up.