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Check that the priming bulb is fitted with the arrow pointing in the directions of flow to the engine. Make sure the vent is open on the fuel tank. Check all fuel lines for kinks or blockage. If none of that fixes it, you need a marine engineer to check the fuel pump and carbs.
With a boat 44 years old, your boat engines may have been replaced or at minimum, overhauled. You might resubmit your question with some easy information you can add:
Gasoline or diesel engines?
Many were Crusader engines & you can usually see the name like this on the top portion of your engines.
You can see what color the valve covers are (blue, black, etc.).
You can see if they are V-8 engines if they have two long valve covers on top.
Most engines have a name plate on them (yours may be gone if original engines). Any mechanic you run into might find it quickly or recognize the engines.
Disconnect the block heater. There should be a 6-8AWG cable running along the top of the engine. This heater is needed only in extremely cold climates. They may smoke a bit more, but your voltage should remain steady between 12-13VDC.
They used to check oil for water by dripping a drop on a hot surface, if it sizzled it had water in it, If it smoked , it was just oil. I would do the water test and then find the leak if you have water in there, Hope this helps.
First - Never use starting fluid on a 2 stroke engine. It could wash the oil off the bearings and cause the engine to seize. Try using WD-40 to start it when it is cold. Another thing to try is getting a spray bottle and put your mix gas in it - then spray that into the carb to get it started.
Most of the primar bulbs are 'universal'. You could pick them up any boat supply house, you can also try NAPA.
Two stroke motors smoke. Here is some things to check -if it is oil injected see if you can adjust the amount of oil, if you have to premix the gas, double check your mixture ratio. I like to run most two stroke engines at 40:1 but use good quality 2 stroke oil.
Yes there is. Saw one at a boat show and I believe it was also Swedish. You may want to look for used replacements on the web. I do not know where you live, but there are boats on the Great lakes with low hours because of the short boating season. There are also victims of hurricanes with good engines down South.
I owned one diesel engine. I would say the engine siphoned the diesel after it was shut off.
The throttle controls may not be closed. The injectors were tested for their opening and spraying, but were they tested for closing and sealing when off? Diesel fuel lines maintain a vacuum or they get air bubbles. Cooling cylinders create a draw right into the crankcase. Last idea-crankcase vent clogged