I have a 95 fourwinns 238 vista with an OMC 5l efi ford motor. It runs smooth but I am only getting 4,00o rpm at WOt and it should run out at 42 to 4600 rpm. Also I brought the boat in fl and I live in mt so I changed the pitch from a 15.5 x 17 to a 15.5 x 15 hoping this would solve the problem. Well I only gained 200 rpm. last summer i put new risers and exahast manifolds because the motor took on water from a wave slap. I did read a thread about a flapper getting stuck in the y pipe and was causung the same issue so i took the boots off and had my wife reach her hand all the way down the y pipe and she could fell no blockage. Do you think I need to remove the y pipe to check further or go another route? Do i have to remove the motor to get the Y pipe out?
I took it out today and it surges and dies. It also sounded like it was backfiring.
I took it out today and it surges and dies. It also sounded like it was backfiring.