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There is no tell tale.----Folks maintained the water pumps back in the day._--You need to install a new impeller.-----Lots of u-tubers can give you tips.----
Tear motor apart.-----Inspect all parts.-----Check your budget.-----You need 4 new pistons.----4 new ( updated ) wristpin bearings------New waterpump kit..------Gaskets.----Make sure lower unit is in good condition .-----Perhaps a teardown and inspection there with a seal kit.----WISECO is one...
You can put that ultra pro gear in there.-----But is is electric shift and a TYPE-C gear for electric shift is to be used.----Now marketed as " PREMIUM BLEND " by BRP-----Time to talk to your local shop as the internet will sell you what you ordered ----Right or wrong.
They came with a 10 amp belt driven , optional generator.-----But today you might be able to fit an alternator from small car.----Depends on what tools / ambition you have.
Your location.-----evinrudeparts.ca -----Is but one excellent source for parts.-----Check gear oil for water.-----Test electric shift function before spending any beer tokens !----Can be done with 12 volt battery and motor does not need to run to at least get an idea on lower unit condition.
Welcome to the broken piston ring club.-----It is a bad design of the top piston ring that leads to this failure.------Thousands of these motors from 1973 to 1998 have had this failure.-----And almost all the rest will soon fail.
Take the lower unit off.----Inspect water pump impeller and housing.-----Post the compression test numbers.---Does spark jump a gap of 1/4" or better on both leads.-----Do a complete evaluation of this motor before spending any beer tokens.----
It is a 1968 model.------It left the factory with a 10 amp belt driven generator.------It needs that as gearshift draws about 1.5 amps when underway.-----A fine motor if you have the knowledge to do simple maintenance.-----It will need a new water pump impeller before launching.----Your...
They have had the jet in the bottom of the bowl since about 1950.-----Only time there would be an issue if folks leave fuel in the carburetors.-----Empty carburetors stay clean.
There are many folks who embrace older motors.------Parts are cheaper.----But you have to take the time to learn how to maintain these motors.-----They are sweet running motor when in good condition.
Can you take the wood out now ?-----You might be able to put new wood it without the grinding.-----Hint----I do not see any welding burn marks on the plywood that is there now
Sometimes I think I should reply with.-----" I had a motor just like that.----Did exactly the same thing as yours.---After a new powerpack and coils it ran like new again "-----Just for entertainment.
Motor needs 4 things to run. ---Fuel.---Crankcase compression.-----Cylinder compression.-----Spark at the right time.----Simple trouble shooting finds where the issue is.