I was recently riding my 450te when a wobling sound got into the machine. While i kept using it in the trail the worst the sound got. The engine oil was at a correct level and it was recently changed (golden spectro 10w 40 fully synth). The engine never got overheated but I noticed the water in the radiator was decreasing becuase I had to complete it several times during the trip. I really don't know were this coolant went because a checked the radiators and it didn't have leaks and the reservour was not tossing it away. Has someone faced a similar situation, what was it, what could it be?