I have a Johnson 150, about '79 or '80 model (anyhow, pre-VRO) on an 18' fibreglass runabout planing hull. The boat and motor combination weighs about 950 kilograms (2,200 lbs?). Motor runs well but I don't know how far I can rev it safely. Had it to 4,500 with plenty left. Any drama at higher...
