Yamaha question?

Discussion in 'Washington Fishing Reports' started by Sockeye71, Jul 23, 2019.

  1. Sockeye71

    Sockeye71 If it swims... we will hunt it down and club it!

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    Looking at 2006 Yamaha 115....

    It has these symptoms.

    The motor starts runs and has great RPM but intermittently under load it acts like it’s starving for fuel. About 75% of the time runs excellent and then out of the blue it gets bogged down for a while before recovering


    Fuel pump?
    Tank pickup ?
     
  2. RoundtheOutside

    RoundtheOutside Newbie

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    Injectors, just happened during hali on my 2006 250 yami
     
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  3. evilkhemist

    evilkhemist Member

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    Injectors or vst filter
     
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  4. Salmon King

    Salmon King I've posted enough I should edit this section

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    Yep, injectors or VST. Or fuel supply.

    Check fuel supply: does the bulb remain hard? Pull off the cowling and watch it run. Does the fuel filter/separator under the cowling get air ingress?

    Then go get your injectors cleaned and tested.

    Finally, go tear into your VST, clean it out and new filters. This is getting expensive.

    Finally, check the high pressure fuel pump. If that is bad then... oh boy. They are expensive.

    I bet you’ll solve if before you get past injectors.
     
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  5. TonyG

    TonyG I've posted enough I should edit this section

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    Tim nailed it. I ended up needing.to do all these on my 05 115 Yamaha this year. Also make.sure that ethanol resistant fuel lines were used. Industry was in transition at that time.
     
    Last edited: Jul 23, 2019
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  6. Sockeye71

    Sockeye71 If it swims... we will hunt it down and club it!

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    this is a used one i may buy cheap....
     
  7. Sockeye71

    Sockeye71 If it swims... we will hunt it down and club it!

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    Estimated cost? ballpark?
     
  8. SalmonSnatcher

    SalmonSnatcher Newbie

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    I had this same motor and agree it’s the injectors and/or VST. First step is to clean the injectors which if I recall was less than $100. Remove the injectors and take to Doctor Injector. YouTube how to remove and reinstall, not difficult.
    If it still runs poorly after that it’s the VST. This can be done on your own but it’s a bit of a PITA. Took me most of a day but I’m no pro mechanic. Replace your plugs, fuel filter and oil while you’re at it.

    Remove any ethanol fuel from the system and only buy ethanol free fuel.
     
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  9. robodad

    robodad BullShitoligest

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    Dave I have this same motor and had the same issue a few years ago, changed the thermostat (sounds strange I know) but that cured it !! I'd start with that !
     
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  10. Salmon King

    Salmon King I've posted enough I should edit this section

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    The 100 for the injector cleaning is spot on. I used Dr Injector. I had them run a before and after to see what flow improvements had been made.

    The VST is just a lot of work if your handy plus random filters and stuff. It doesn’t really add up until you get to the fuel pumps.
     
  11. Roll the Bones

    Roll the Bones Dr. Fong

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    Get all the filters in the VST tank and just before the tank, then clean the injectors problem solved. Do it yourself for $200 in parts and Injector Doctor.
     
  12. Captain Decent

    Captain Decent I've posted enough I should edit this section

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    If it were injectors it would be more likely to be a constant problem under a given operating envelope. This sounds more like VST symptoms.

    Cracking open the VST isn’t very hard just a little pia with some hoses and wires in the way. I’d change all the filters out while you’re at it.
     
  13. Wild Bill

    Wild Bill Drinking the Suzuki Kool-aid and liking it!

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    For injectors use the injector doc in Kirkland vs the one in Lynwood. This advice comes from a trusted outboard mechanic in Everett.
     
  14. Wild Bill

    Wild Bill Drinking the Suzuki Kool-aid and liking it!

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    And holy shit that is a lot of stuff to take of to get to vst on that motor. Yamaha engineering fail.
     
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  15. TonyG

    TonyG I've posted enough I should edit this section

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    Agree
     
  16. Kettel O' Fish

    Kettel O' Fish Well-Known "Member"

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    Agree with all above...my 07 115 Yamaha motor at low rpm would sputter...that was VST filter. My throttle sensor (TPS) went bad causing it to do exactly what your boat is doing...easy fix. Well, nothing is "easy" but nothing major. Always something!
     
  17. liltrouble

    liltrouble Well-Known "Member"

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    Big Dave at Cascade in Everett is the bomb ion VST. Fast and economical. A lot of people take their engines to him for this. i will be scheduling my 150s for this when i bring my scow back from Westport.
     
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  18. Wild Bill

    Wild Bill Drinking the Suzuki Kool-aid and liking it!

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    He is the one who advocated using injector doc in Kirkland.
     
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