mercury 50 hp 2 cycle 1981 serial #5634516
water exhaust stream extremely hot - can't hold your hand under it. Have replaced the impeller on the water pump. Stream is intermittent -- takes a bit for it to even start flowing when I start it. Then when I speed up the boat in the water it will even quit flowing and some steam will come out of the water exhaust tube -- when I slow down it goes back to intermittent flow. When the water is flowing it also has steam with it -- the outside air temp here when that happens is 80+ degrees.
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