1957 Big Twin 35hp questions oil, engine "Bucking"

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  • June 10, 2015 at 2:07 pm #17910
    touch-of-grey
    Participant

      Even with today’s improved oils I would still run it at 24:1. Oil is cheaper than parts and synthetic or semi synthetic run cleaner than the old oil and smoke less anyway…Charlie

      June 11, 2015 at 11:41 am #17958
      vintin
      Participant

        Wonder if the bucking could be fuel starvation?

        Meaning when the motor is run at high speed it drains the float bowl.

        Are you sure the filter screen in the tank is clean?

        June 11, 2015 at 11:59 am #17959
        fleetwin
        Participant

          US Member - 2 Years

          Yes, definitely run the engine at 24:1

          June 11, 2015 at 8:09 pm #17989
          pappy
          Participant

            US Member - 2 Years

            You’re going back to a 35:1 ratio.
            Why would you intentionally run this classic engine on anything less than the recommended ratio?
            When on 24:1 and properly tuned there is very little smoke so it couldn’t be that…..

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