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Thread: Outboard Issue

  1. #1
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    Default Outboard Issue

    Got a 2018 Yamaha VMax 115 and it keeps cutting of at low RPMs. Cranks right back up and never cuts off when running 1/2 throttle to wide open. Any ideas?


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  2. #2
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    Usually a 2 stroke issue

    Any difference between in gear vs neutral?

    Have a small portable tank you can hook up to and see if problems persist?

  3. #3
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    Quote Originally Posted by SouthernWake View Post
    Usually a 2 stroke issue

    Any difference between in gear vs neutral?

    Have a small portable tank you can hook up to and see if problems persist?
    Seems to do the same when in gear and neutral


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  4. #4
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    When running is it giving you any issues or RPM fluctuations?

    I’d still get my hands on a portable tank with fresh fuel and bypass the fuel system for troubleshooting.

  5. #5
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    You using non ethanol fuel? My 115 would idle bad periodically before I started use non ethanol fuel. Run a can of seafoam in it when the tank was low and it would typically run better.

  6. #6
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    Have someone pump the primer bulb when its "cutting out" and see if it picks back up. If it does, check LP fuel pump for leaking behind it.
    Also change the plugs, they are cheap and easy to do. Have your son put the plug change on his channel
    Could also be Idle control valve or TPS slightly out of adjustment
    Last edited by ecu1984; 09-19-2021 at 11:27 AM.

  7. #7
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    I’d try some sea foam first.

    That’s some good stuff and helps a lot with fuel issues on all types of engines
    I am a nobody, that met somebody, that can save anybody.

  8. #8
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    Quote Originally Posted by bompa View Post
    You using non ethanol fuel? My 115 would idle bad periodically before I started use non ethanol fuel. Run a can of seafoam in it when the tank was low and it would typically run better.
    Always use ethanol free


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  9. #9
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    Quote Originally Posted by SouthernWake View Post
    When running is it giving you any issues or RPM fluctuations?

    I’d still get my hands on a portable tank with fresh fuel and bypass the fuel system for troubleshooting.
    No issues with that. Just shuts straight down


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  10. #10
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    Sea Foam - I buy it by the case

  11. #11
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    Quote Originally Posted by ecu1984 View Post
    Have someone pump the primer bulb when its "cutting out" and see if it picks back up. If it does, check LP fuel pump for leaking behind it.
    Also change the plugs, they are cheap and easy to do. Have your son put the plug change on his channel
    Could also be Idle control valve or TPS slightly out of adjustment
    I just reread your post, i thought it was cutting out, but now see it is cutting off,
    Fuel delivery is first suspect. Idle control valve will do that also. Its easy to check LP pump for bad diaphram, google it.

  12. #12
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    Could also be your shift interrupt switch out of adjustment, lots of things it could be

  13. #13
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    Do you have digital gauges and if so do they cut off when the motor shuts down? My bet is a ground/power issue. Some f115’s had a service bulletin related to a grounding issue. Had a fail to fire situation on my f150 a few years ago after it was warm, ended up being corrosion on the main ground to the block, cleaned it up and no further issues.

  14. #14
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    Quote Originally Posted by Whackumstackum View Post
    Do you have digital gauges and if so do they cut off when the motor shuts down? My bet is a ground/power issue. Some f115’s had a service bulletin related to a grounding issue. Had a fail to fire situation on my f150 a few years ago after it was warm, ended up being corrosion on the main ground to the block, cleaned it up and no further issues.
    it could very well be electrical

  15. #15
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    Quote Originally Posted by Whackumstackum View Post
    Do you have digital gauges and if so do they cut off when the motor shuts down? My bet is a ground/power issue. Some f115’s had a service bulletin related to a grounding issue. Had a fail to fire situation on my f150 a few years ago after it was warm, ended up being corrosion on the main ground to the block, cleaned it up and no further issues.
    You know now that I think about it my radio may have been cutting off


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  16. #16
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    Quote Originally Posted by ecu1984 View Post
    I just reread your post, i thought it was cutting out, but now see it is cutting off,
    Fuel delivery is first suspect. Idle control valve will do that also. Its easy to check LP pump for bad diaphram, google it.
    Fuel was my 1st thought as well


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  17. #17
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    I had a Vmax that would cut out at mid range only (3000-3500 rpm) … was a ground issue. There is much electrical going on under that cowling. Check fuel first as described, and primer bulb and check all electrical connections on the main ground
    “The price of freedom is eternal vigilance” - Thomas Jefferson

  18. #18
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    Quote Originally Posted by b35w View Post
    Fuel was my 1st thought as well


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    have someone pump the primer bulb right before the time it usually does it and have them keep pumping it.
    It is runs normal, get back to me
    I also believe a Yamaha dealer can pull codes from the ECU
    Last edited by ecu1984; 09-19-2021 at 05:38 PM.

  19. #19
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    Quote Originally Posted by ecu1984 View Post
    have someone pump the primer bulb right before the time it usually does it and have them keep pumping it.
    It is runs normal, get back to me
    I also believe a Yamaha dealer can pull codes from the ECU
    If throwing a code it should show on the gauge.

  20. #20
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    I do not have digital gauges


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