Posted early this week about motor surging after being on the water for 15 mins. think maybe narrowed it down, took off exhaust and manifold blocked manifold hole blew a little air in the water line had air comming out of back cylinder the front seemed fine. my ? is, is there a kit of gaskets and o rings that would possibly fix this or is it something far worse? i have never took off the top end of one of these. is there much to them? can the who-done-it mechs handle this or should some thing like this be turned over to the pro's.