I have a 21.5' Seawswirl Striper walkaround with a 150 hp Johnson Oceanrunner(1997). The motor runs strong but when it is at WOT throttle I am a little low on the RPM side. When I bought the boat new it came with a 15"x17" aluminum prop. With a full load I run about 4800-4900 RPMs, so I switched...
