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Used cylinder head is easy to find.-----Your location?----Try on E-bay.

Find it on ----Crowley marine website.

That threaded tube was an option for dual steering cables.----So yes you have to move that to grease those fittings.

The 20AHRJAS is clearly listed with the SEADRIVE line up of motors !

Time for a big $$$$ 4 stroke with a computer ????

Thermostats are found behind the cover at the top of cylinder head.----Clearly shown in parts diagram.

Forgot to mention a partially plugged carburetor.----At any rate if you rebuild it ,you do need to determine the cause.----If not it will fail again.

Broken piston ring.----Overheating.----Ignition too far advanced.-----Water pump tell tale not changed to come off top of block per service bulletin in 1994?----Wrong prop?----Poor quality oil.-----Water pump impeller not changed every 5 years.

Motors were NOT white in 1975.----Clearly is a newer ( 1988 3 cylinder ? ) motor.----No such thing as a " temperamental " motor if it is in good condition.----Picture of cowling may help identify.

No red primer valve on 1975 models.----Need pictures and model #.-----Perhaps a newer powerhead ( 1985 ) was installed on a 75 model

Model # is ?------Most have a thermostat.

Primer bulb on the hose does not stay hard when motor has started.

People start molesting outboard parts when they are guessing , in my opinion.

Depends on where you do your boating.-----Depends on how careful you are.-----Do you have a chart plotter?-----Hitting a rock with stainless can do a lot of damage to lower units these days.

This spring holds the choke butter flapper OPEN at full throttle .----Keeps them from fluttering and wearing out the shaft.----Someone else can likely post a picture for you,

Shop that I worked at many years ago did one as a " something to do " project over the winter.----Shop rates today make work like that very expensive.----Doing this work yourself is a good way to build what you want.

Sailed on a 28' wooden boat built around 1972.----Did not leak at over 30 years old.----It is still in the water today.----Hope to sail on a 30' sistership soon against the 28 footer.----Wooden boats built by a Vic Carpenter.

At 65 INCH LBS the nut should not strip.

edited

No neutral detection switch on that motor.----Might be running on 1 cylinder.----Does spark jump a gap of 1/4" or better on both leads?