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85 9.9 4stroke carb schematic

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  • 85 9.9 4stroke carb schematic

    hi; i've looked all over but i can't seem to find a scematic for my 85 9.9 four stroke, i'm not sure what direction the main valve(?) should be facing. also my oil is getting saturated with gas, any ideas? thanks in advance guys

  • #2
    1985 F9.9SK Yamaha Outboard VALVE Diagram and Parts

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    • #3
      Originally posted by howie597 View Post
      hi; i've looked all over but i can't seem to find a scematic for my 85 9.9 four stroke, i'm not sure what direction the main valve(?) should be facing. also my oil is getting saturated with gas, any ideas? thanks in advance guys
      what is this main valve you speak of?

      thermostat stuck open causes a cold motor and could cause gas in oil.
      so can over propped lugging the motor.

      too much idle or trolling time can also

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      • #4
        sorry, it's the "main nozzle", and we do troll for hours
        Last edited by howie597; 05-15-2016, 12:00 AM. Reason: typo

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        • #5
          Per the header of your post, I think your referring to the carb:

          1985 F9.9SK Yamaha Outboard CARBURETOR Diagram and Parts

          The jets are tightened down fully, there is no adjustment (inside the float bowl)(short of swapping jets).

          If you can post, from the link above EXACTLY what part your referring to would help..
          If its part #9, it appears the "taller part" faces the engine (per the pic).

          Re oil and gas, what exactly is the issue??
          Last edited by TownsendsFJR1300; 05-15-2016, 07:04 AM.
          Scott
          1997 Angler 204 CC, 2006 F150 TXR

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          • #6
            yes, it is part #9, i have burned less then 5 gallons of fuel since the last oil change and when i checked the oil level it was about a 1/2" high and it does burn a bit of oil so i had figured it would be low. the oil looked thin though, so i poured some on a stick and put a lighter to it and it started burning,for comparison i tried doing the same with oil from my truck and it did start up like the outboard gas did.

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            • #7
              Originally posted by howie597 View Post
              yes, it is part #9, i have burned less then 5 gallons of fuel since the last oil change and when i checked the oil level it was about a 1/2" high and it does burn a bit of oil so i had figured it would be low. the oil looked thin though, so i poured some on a stick and put a lighter to it and it started burning,for comparison i tried doing the same with oil from my truck and it did start up like the outboard gas did.
              Can you smell gasoline in the oil?

              Being a 1985 motor, 31 years old, I think I'd be looking at rebuilding the carb, checking spec's and especially checking that the float itself is not leaking, thus allowing fuel to continuously enter the carb when the engine's running (not close off when the float rises).

              Re part #9, why do you ask?
              Last edited by TownsendsFJR1300; 05-15-2016, 12:31 PM.
              Scott
              1997 Angler 204 CC, 2006 F150 TXR

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              • #8
                because in the previous post you referred to it as part #9. the fuel nozzle

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                • #9
                  Originally posted by howie597 View Post
                  i'm not sure what direction the main valve(?) should be facing.
                  I believe this is why he was asking

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                  • #10
                    Thanks ^^^
                    Scott
                    1997 Angler 204 CC, 2006 F150 TXR

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                    • #11
                      thanks guys,
                      Last edited by howie597; 05-18-2016, 11:34 PM.

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