First, empty your fuel tank and pour a 2% fuel mix in it.
Remove the oil hoses coming to the carbs. Put the ends in 2 recipients.
Run the engine for a few minutes. Oil must come in the recipients. I couldn't find an exact quantity in the Service manuals.
The theoretical mix is 50:1 ( 50 liters fuel with 1 liter oil)
So, the best way is to have a full tank 50/1 fuel/oil mixture AND a full oil tank.
Sail a few hours, refuel ( count how many liter you've burned. Refill the oil tank to level.
Check that the fuel/oil ratio is about 50:1.
You can adjust the mixture with the cable on the oil pump.
SOURCE: fuel pump location on a 1998 yamaha wave runner xlt 760
'Fuel pump' -> Uses the diaphram within the carb. Rebuild / get new gaskets for carb.
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