"I got engine and because of it sitting for years unused I got carb kits and rebuilt carbs. got new fuel pump on engine and replaced. new fuel tanks, rubber lines, bubble pump, and fittings. checked and cleaned dist. rotor and set points to what was writen on cap. replaced plugs. Did compresion test came out good. Went to dealer got recomended oem prop for size of boat. The engine runs smooth and clean but the rpms stop increasing @ half throttle, the butterflys are opening all the way"