hey everyone, ive got a 94sih 4 stoke yammie 9hp kicker ive got my boat at oakbay marina and havent been out fishing for a while. but i go down twice a week an run the engines (idling) i noticed a few weeks ago that the stream of the kicker was more like a spit. then last week no water what so ever. is it salt build up? or should i pull the boat an look at the impeller?