Okay so I have an 2005 KTM xc sitting here that I am looking to do the valves. I have gotten to the TDC where it should be to do the valves. (The TDC on the compression stroke) I am trying to adjust the valves to .005 of clearance. Now these valves are so tight that I cannot even get a feeler gauge in there when I back the screws all the way out. Does this mean I have the wrong TDC or does this mean the valves are sinking into the head and new valves or head is needed? When I check the valves not at TDC they are loose. But i figured it would be wrong to check the valves not at TDC.