Reply To: Johnson RDS-23 1961 40 HP acquired; need general advice

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April 12, 2026 at 1:16 pm #315165
Don
Participant

    US Member

    Yes, it is important to confirm the powerhead and gearcase are in serviceable condition before getting in too deep on this project.  Compression readings that are even and above 90PSI are probably OK.  Gear lube that is a little milky is “OK” provided you change it more frequently…But, raw water draining out is a bad sign, as is nothing at all draining out when you pull the lube plugs.

    Generally speaking, you will want to overhaul the ignition system, clean and rebuild the carb, replace fuel lines, replace the water pump impeller in order to get this engine running reliably.