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Yamaha 15hp 2 stroke stalling on throttle advance

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  • Yamaha 15hp 2 stroke stalling on throttle advance

    I have a Yamaha 15F 2 stroke, that starts and will idle OK but when throttle advanced engine stops. Spark advances OK at this stage.
    Is this just a fuel problem?

  • #2
    Have the carbs ever been removed and cleaned?...sounds like a plugged carb jet to me

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    • #3
      Yes have stripped and cleaned carb and fuel pump, but can do it again.

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      • #4
        That's probably your problem.....maybe install a fuel/water seperater /Walmart/Attwood unit is $25).....easy to install and great preventive maintenance so this won't happen again....use Stabil in your gas tank all the time...

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        • #5
          Thanks Robert

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          • #6
            This motor also backfires when advancing the throttle and spark. Cleaning all fuel lines, carb, and filter bowel have not made any difference. What would be causing this symptom ? Help.

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            • #7
              I don't know about that one but hopefully one of the gurus on here can offer some ideas for you....

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              • #8
                Start with a model # or pictures of the motor.-------Would a 15F be a 4 stroke ??

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                • #9
                  The motor is a Yamaha 15hp 2 stroke ( 15FMH 684K / S / 1035290 N

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                  • #10
                    When doing that will OB spit fuel backwards of carb ? Being a 2 stroke OB could be doing that due to a reed valve related problem ?

                    Happy Boating


                    Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

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                    • #11
                      That is hard to tell with the air intake covered. Could it be a timing problem?

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                      • #12
                        Timing on modern outboards does not go out of adjustment.-----But the flywheel key could be sheared and that does change timing.----I would check the key, it is a " no money spent " procedure.

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                        • #13
                          Does that motor have a linq and sinq procedure to set timing with carb linkeage after carb removal?....if so, it's in the manual...

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                          • #14
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                            Yes I am looking at the manual now and will check the timing settings in accordance with manual requirements. I must admit that I have had the flywheel off and assumed that it aligned with the key when I replaced it. I will check it again. This motor has been going fine for the last 14 years until it blew the charge coil and CD unit which both have been replaced.

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