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About 35 years ago I visited a marina looking for an alternator belt for an Atomic 4 inboard.---Place was closed.---Saw a fellow working on a 3 HP Johnson.-----Quickly determined that high speed jet was plugged.----Fixed that.----Folks came along seeking a mechanic to look at an Atomic 4.-----"...

Agreed----About the only thing that can go wrong is a ruptured diaphragm or dirt in check valves.----Easy fix in my opinion.

I warm up condensers and test them with a -----MERC-O-TRONIC -----Magneto analyzer.----They test OK when cold and often fail when warmed up.

Those 18 HP and the 25 HP were produced to 1976.----Sweet running motors.----I would never get rid of a good one in favour of a modern " built with plastic " offshore motor.

Jbyers----Must be busy doing all the checks or reading how to operate an older motor.----A compression test should be done before spending any beer tokens on it.----And it needs a new impeller before launching the boat.

And if that balsa core material has somehow gotten water in it , then it might be compromised in strength.

A 15 " transom is for short shaft motors.---Your 1960 Fastwin would have a 5" spacer if it was a long shaft.-----A 16" transom is also considered short by many builders.-----Order a shortshaft ( 15" ) motor from Tohatsu

Visit ----composites canada---and--Noah's boat building supplies.-----Lots of information.

Agreed-----Most folks just do not know how boats are built.------The parts folks see in the show room are fiberglass.------Then there is foam core / balsa core / cheap plywood , for transom and stringers.----Have even seen chip board ( beaver puke ) used for stringers.----The project I am doing...

Have to start somewhere and this is what I would do---Check for water in fuel tank.-----Check gear oil.-----Use timing light to see if you can pinpoint ignition issues on one of the leads.

.----Serial # ?-----It is shown on the lower cowling on some 30 HP models----

Plug fouling ??----Maybe there is something else going on.-----Plugs are well engineered / specified for a motor.------Plugs rarely fouls on modern engines.-----Only the operator who THINKS that plugs are fouled.

Better to be careful with prop selection.----As it is , you might have the wrong prop for this boat.----You run the risk of serious motor damage !!

What pitch propeller is on the motor?----- 23" pitch I hope.

Hard to believe that the boat goes 45 MPH with 1/3rd throttle.

If the transom is 15" high , a standard 15" ( short shaft ) motor does the trick.-----But try raising the motor 1/2" to see if spray is reduced.

A 10 second google search said they had been around for 60 years.----With up to 400 employees.----St Augustine , Florida----Easy to find.

???----A cam ?----Then you indicate 2 st -----Pictures or a serial #

Throttle valve MUST be closed at idle.

Ceased operation in 2008.-----There be lots of information on the web.----Used google ???