Have any of you guys herd this. OK I know all 4-strokes make all sorts of noises and one could make a noise another one doesn't, especially 450S. But it didn't do it at first (10 hrs. or so) . Then one day out of the blue I started it up and herd a tick at idle. Worried i took the top cover off to see if i could see anything, nothing. oil was perfectly fine and already changed 3 times. It starts and runs fine, it rips, and its only at idle. Took it to the dealer, they basically said don't worry about it. should i?????