Gradyrook61
New member
Hey, Rookie boater here who has a 1986 Grady white with the gm 305 4v engine. I have just finished normal maintenance. Oil change, plugs,wires,cap rotor fuel filter, water separator. My question is this. My boat runs great but I only achieve 32-3400 rpms at wot. I'm only getting about 25mph. I'm thinking I should be running about 4- 4500 and about 40 mph at wot. I'm not a mechanic by any means but I'm capable of most wrenching fixes. What could be holding the motor back? I wish I new what carb came stock on this boat. I have a mercruiser 2barrel and i thi k from what I've read so far it may have come with a Rochester 4 and for whatever reason was swapped out. My boat weighs 3750. Would changing out the 2 to a 4bbl help my issue? Thanks in advance people!