Re: Age of Johnson Super Sea Horse 40 HP
Yes, most likely the impeller. There's also a thermostat up under the triangular plate in the head that may be stuck. I would replace both if I were you.<br /><br />Johnson RDS-27<br />Year: 1965<br />HP: 40<br />WOT RPMS: 4500 (4000-5000 RPMS)<br />Displacement: 43.9 cu.in. = 719.4 ccm<br />Cylinders: 2<br />Gearcase ratio: 12:21<br />Spark plugs: Champion J4C (was J4J) gapped at .030"<br />Fuel/Oil Mix: 50:1 87 octane gas to TC-W3 rated outboard oil.<br />Lower unit oil: OMC/BRP 'HiVis' or equivalent 90/80W outboard gearcase oil.<br /><br />Iboats, NAPA autoparts, and your local Johnny/Rude dealer can get you the parts your going to need. But the first step is to pick up a service manual. It's the best money spent.<br /> <br /><br />Welcome to Iboats!
