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Hello,

After 1 year without being used, the engine starts very well and runs smoothly. when increasing throttle, no problem until reaching 3.500 Rpm. Then engine runs roughly, Rpm does'nt increase.Fuel line checked and changed, carburettor float bowls are clean.
Thank you for your help.
  • Re: 912 not above 3.500 Rpm

    by » 6 years ago


    Make sure the carburetor pistons slides easily, if they don't move easily they may not move equally and the carbs go out of balance and the engine runs rough. Take off the top carb cover, clean and lubricate piston shaft and top cover internally. Make sure to align diaphragm with carb when reassembling.

  • Re: 912 not above 3.500 Rpm

    by » 6 years ago


    Hi Garett,
    Thank you for your help. I disassembled top carb covers and surprise ! One throttle valve spring was missing !
    The mystery is this motor was running well one year ago with this missing spring as nobody did anything on this carbs since one year .......Don't understand !

    Thank you said by: Wayne Fowler

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