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rock44

70 hp johnson outboard wont go full speed

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How did your mechanic determine you had internal damage from overheating ? As posted if the compression is good the engine is potentially salvagable !Do you known that the engine was overheated ? Commonest causes are a blocked intake , usually from a plastic bag blocking the intake or an impeller that was not changed at a regular interval which would disintegrate and pieces would block the water passages ! The wrist pins on the pistons would go or the needle bearings on the crankshaft would go ! Turning the motor by hand may give an audible sound , then it is probably " game over " ! If not it should start then there would be no doubt with the knocking sound !

Again how id your mechanic decide that you had internal damage  ?

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He said he sprayed  ether on block while it was running and it sucked it in and motor stopped. So a vacuum leak is apparent there. That would mean its a gasket or seal where the blocks come together  i believe 

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Why would you spray either on the block ? Spraying either on the spark plugs , into the combustion chambers and throats of the carbs may give some indication that the problem is fuel if the engine does start momentarily and  not electrical !

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