I have a 1998 XT600 that has lost a lot of power. It starts and rides fine but runs out of steam at 70mph. I suspected a fuel issue and checked for a vacuum leak with carb cleaner and the revs remain constant. Checked the diaphragm which is good. Carbs are clean with no signs of wear. Fuel flow from the tank is good. Think I am missing something obvious and installing and removing the carbs is difficult so any thoughts would be much appreciated.
I will never complain about access to parts on the TDM again