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Yamaha 15hp four stroke

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  • Yamaha 15hp four stroke

    Good evening,

    It is an 2005 and I have had it about a year. It has always ran rough at idle. It was cutting off at idle until it was rebuilt the first time. It continued to idle rough but wouldn't die. Had a shop rebuild it again and now a new carb. Still idles rough but great other than that. I have changed all fuel lines, new tank, filters, non ethanol gas. It's only a pull start check compression both cylinders are about 70psi.

    2nd question is.. at only about 3/4 throttle there is a winding sound almost like a super charger. Nothing above or below that rpm range. Any ideas?

  • #2
    Carburetor rebuild


    • #3
      Have you checked valve lash?


      • #4
        I have not checked the valve lash.


        • #5
          I checked them. They are within specs.


          • #6
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            Originally posted by countryboy996 View Post
            I checked them. They are within specs.
            Sync carbs correctly?