water test today with 2005 BF150 new to me and my 21' center console. previous engine was a 150 yamaha 2 stroke 19 pitch prop. Engine started immediately (purred) and motored out of the marina fine. went to get on plane and couldn't get it to rev over 3100 and didn't get on plane, 3 tries with trimming ect and then motored back to the launch. When I disengaged the shifter at the binnacle, i can easily rev to 4500+. I'm at a loss which direction to proceed.... filters ect, or reprop from the 19 to more like a 15..is 19 too much pitch for the weight of the boat and hp of the engine? 14" diameter prop. I don't know the weight of the boat but am guessing in the 3500# range. or is it a fault in the engine not developing enough power and is that the route I should go first. Suggestions?
