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    Leaking Oil Pump on 1988 Yamaha 90

    I've been having an issue with oil leaking out through the prop exhaust. I was told that the check valve inside the oil pump was leaking by and a quick fix would be to install a check-valve in each oil lines enroute to the carbs. This was done but oil continues to leak out the prop exhaust. I...
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    88 Yamaha 90 HP Oil Inj. leaking into cylinders when not running

    I'm' finding Oil that has leaked onto the ground below lower unit, that appears to have come from exhaust port around prop, which there is oil dripping from the skeg on the lower unit. I was told that the internal check valve within my oil pump is letting oil pass thru into my cylinders and then...
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