Have just got a s40. I had it about 2 weeks I notice at all rpms a tick from the cylinder head. its has 2500 miles had it in for service , just to have it check out and gone over. Dearler said everything check out OK. An was within specs. Is this just a nomal sound this bike makes, runs fine and is a blast to ride. Just wanted to know if all is OK, thanks for any output it will be appreciated