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The serial numbers are on the transom bracket where your engine bolts to the back of your boat !
If no numbers then remove the gearbox and take the impellor and its housing to a dealer and they should be able to match them !
Your GS is wet sump therefore it does not have gearbox oil. You put oil into the filler hole (normally about 3 to 4 liters) this flows to the bottom of the engine (sump) and is then pumped all around the engine including the gearbox. If oil is leaking from this hole I would suggest something is missing i.e.sensor, plug etc or someone has drilled it out. You need to find someone with your model GS annd see if they have the same problem and/or a Workshop manual to work this out.
Undo gearbox bolts,take off trim tab,undo bolt in trim tab cavity,disconnect speedo tube,pull off gearbox. You will see pump housing,undo 4 bolts,pull off housing exposing impeller,there maybe a clip on top of impeller depending on model,pull off clip then impeller.yamaha didn't make outboards in 75
Suzukis are normally a mission to work on especially if it is a two stroke,so I suggest you get a workshop manual.all gearbox bolts must be undone,the gear linkage is under the bottom carb,this is the tricky part,you have to loosen a nut at bottom of gear arm where gearcable fits,then push in with screw driver,this releases gear change shaft.the biggest problem is trying to see what you are doing.good luck
if you mean the water intake on gearbox then the oil seal bellow the impellor housing has failed and needs replacing b4 the gearbox siezes due to water gettin in and not enough oil in it !
remove carbs and clean jets etc ! clean or replace fuel tank and check primer bulb and line not perished ! check compressions and sparks ! remove gearbox and replace the impellor even if it looks ok and replace the gear oil ! run in tub of water for an hour to check cooling and the thermo opening also check no fuel leaks etc !
They dont have a dip stick but do have a bolt that is removed Diff/transfer case and gearbox the bolt you take out is at the height/level that the fluid should be at and its where you fill the diff/gearbox.Its in the side of the gearbox about half way up.
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