I was out on one helluva ride on Saturday with some mates on some very technical stuff (shame those poor sports quads battled like ****) any way whilst on a flat farm road as I opened the Beast up I am sure I could feel the belt slipping! (It was not wet, and no water came out the drain) Is this normal? or is it because I am almost due for my 7200km service? any ideas? How long does a belt last??