I have been riding my Versys for a few months to work and around. I have about 5800 miles on it. Lately with some of the rain from Fay I still have ridden to work and have been cleaning the air filter as suggested byu the owners manual. This morning I hear some noise from the head that I would describe as slapping. I a new rider. Is this the symptom of a calve job coming on? Manual says it should be done around 28000 miles, but I don't want to wait if I need it.