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  1. #1

    Default 2011 Yamaha 4hp 4 stroke won't start or fire

    A friend purchased this and it is in like new condition.
    He took the carb off, cleaned it thoroughly but it does not fire. We put a spark tester on it and there is a good strong spark. We tried different positions for the emergency shutoff switch on the front but my understanding is that there would be no spark if that is not working correctly.
    We also tried disconnecting what we believe to be the disconnect switch but it still has spark but doesn't even sputter.
    I tried carb cleaner and it still did nothing.
    My guess is it has to do with the shutoff switch but is there a fuse or something I'm missing ?

  2. #2

    Default Re: 2011 Yamaha 4hp 4 stroke won't start or fire

    The kill switch/cutoff switch applies a ground to stop the motor from running. It disables the ignition. In which case there will be no spark.

    While cranking the motor mist some gasoline into the air intake system. If it fires then you will know that it is a fuel related problem.

  3. #3

    Default Re: 2011 Yamaha 4hp 4 stroke won't start or fire

    Quote Originally Posted by boscoe View Post
    The kill switch/cutoff switch applies a ground to stop the motor from running. It disables the ignition. In which case there will be no spark.

    While cranking the motor mist some gasoline into the air intake system. If it fires then you will know that it is a fuel related problem.
    We still saw spark so it likely isn't the kill switch. I mentioned carb cleaner. I was spraying it into the carb. I don't expect it to run but I do expect it to sputter with carb cleaner at least for a moment but it does nothing. We'll try a replacement spark plug and if that doesn't work, I don't know what to try next.

  4. #4
    Join Date
    Apr 2010
    Posts
    4,251

    Default Re: 2011 Yamaha 4hp 4 stroke won't start or fire

    What kind of a spark tester are you using ??

  5. #5
    Join Date
    Oct 2011
    Location
    New Zealand and Colorado
    Posts
    23

    Default Re: 2011 Yamaha 4hp 4 stroke won't start or fire

    Quote Originally Posted by boscoe View Post
    While cranking the motor mist some gasoline into the air intake system. If it fires then you will know that it is a fuel related problem.
    Just wondering what would be an easy way to "mist" gasoline into the intake? Plastic spray bottles tend to melt with gasoline, so what's the best way to do it? Thanks.

  6. #6
    Join Date
    Apr 2010
    Posts
    4,251

    Default Re: 2011 Yamaha 4hp 4 stroke won't start or fire

    A metal pump type oil can works real good.

  7. #7
    Join Date
    Oct 2011
    Location
    New Zealand and Colorado
    Posts
    23

    Default Re: 2011 Yamaha 4hp 4 stroke won't start or fire

    Quote Originally Posted by Boobie View Post
    A metal pump type oil can works real good.
    Thanks Boobie, good tip.

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