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  1. #1

    Join Date
    Jan 2019
    Posts
    7
    Location
    Texas
    Mower
    cub cadet 1811

    honda vtwin requires increased choke to run

    Honda Gx620 ran normally for several cutting cycles. Engine began hunting at high speed and faltering. Opening choke about 1/4 helped maintain slightly less than full throttle.After 30 minutes,choke had to be increased to 1/2 ,just to keep running,even with throttle at idle or any slower speed.There are no fuel filters to plug.HELP!!!

  2. #2

    Join Date
    Nov 2014
    Posts
    11,784
    Location
    Australia
    Mower
    Victa slashers & Push , Rover Rancher II's, Cox ( several ) & White LT120 + GT 200

    Re: honda vtwin requires increased choke to run

    There is a fuel tank that has an outlet that gets plugged with debris.
    There is a main jet that gets plugged
    There is a float bowl where all of the crud that the fuel filter would have prevented getting into the carb will build up.
    And depending upon the exact model engine , most Hondas have a fel tap as part of the carb that can block and a sediment trap under the tap that can also clog

  3. #3

    Join Date
    Jan 2019
    Posts
    7
    Location
    Texas
    Mower
    cub cadet 1811

    Re: honda vtwin requires increased choke to run

    Thanks for your suggestions! What is fel and tap?

  4. #4

    Join Date
    Nov 2014
    Posts
    11,784
    Location
    Australia
    Mower
    Victa slashers & Push , Rover Rancher II's, Cox ( several ) & White LT120 + GT 200

    Re: honda vtwin requires increased choke to run

    The Fel is between the Y & I
    Should have been fuel tap.
    On most Honda engines it is on the right side of the carb.

  5. #5

    Join Date
    Jan 2019
    Posts
    7
    Location
    Texas
    Mower
    cub cadet 1811

    Re: honda vtwin requires increased choke to run

    Thanks, I will proceed to check/clean carb and all lines and ports! I had started to replace fuel pump ,suspecting it to be the guilty party.I will report results when completed.

  6. #6

    Join Date
    Nov 2014
    Posts
    11,784
    Location
    Australia
    Mower
    Victa slashers & Push , Rover Rancher II's, Cox ( several ) & White LT120 + GT 200

    Re: honda vtwin requires increased choke to run

    FWIW when I took over the business there were 6 fuel pumps in his inventory.
    Around 3,000 repairs latter there is still the original 6 + 1 Honda pump because the pump on a GX620 is a different size & the ones I had in stock would not fit.
    Because I like to have parts on hand I bought 2 of them.

  7. #7

    Join Date
    Jan 2019
    Posts
    7
    Location
    Texas
    Mower
    cub cadet 1811

    Re: honda vtwin requires increased choke to run

    Cleaned carb and reassembled without replacing fuel pump. Initial start seemed fine without needing choke,but started losing rpm after about 30 seconds. Advanced choke and rpm increased.Removed gas cap and closed choke ,rpm resumed normal. Removed gas cap and removed gas cap vent valve,replaced gas cap and rpm resumed normal without choke advanced. Seems to be a combination of carb needing cleaning and restricted gas cap vent valve. Thanks for your advice. I failed to identify the mower, it is a grasshopper 618 with replacement engine,Honda gx620.The gas cap is standard Grasshopper.

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