My 2001 KLX300 goes TICK-TICK-TICK. The loudness doesn't change with engine speed. It sound exactly like too-loose exhaust valves, but they are just at the upper limit according to specs. (0.008 and 0.009") (0.20 and 0.23 mm) The entire bottom end of the engine is quiet, the piston and wrist pin make no noise. Am I missing something?