Originally Posted by Psycho18th
Just pull the valve cover with the engine at TDC and check the clearances with feeler gauges. If they're off, you'll have to see what shims are in there and replace each shim individually to get the correct valve clearance. Someone found the valve holding tool a few pages back, but I just pull the cams to make valve adjustments. Its only about 8 more bolts, and allows you to inspect the cams and head surface. Best investment you'd ever make is the Clymer service book for the XT. Walks you through all this stuff step by step so things don't get worse as they get removed and replaced
+1 on all of the above
you do need to remove the cams make sure you get the torque on the cam cap bolts right. Use an in/lb torque wrench if you can find one. My ft/lb wrench barely goes low enough. Odds are the valves are OK though.