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  1. #11

    Join Date
    May 2011
    Posts
    23
    Location
    New Jersey
    Mower
    Craftsman LT1500

    Re: Briggs 17.5 HP with Nikki Carburetor Surging only when cold . (Craftsman Lt1500

    A little more testing,

    From 4 gear up if I let my foot of the clutch, when it catches there is a power drop or surge for a second and then recovers. This causes a little buck. Does this symptom provide any other information if there is an adjustment that can be performed or if it needs to be cleaned?

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  3. #12

    2,500 Post Club

    Join Date
    May 2010
    Posts
    4,914
    Location
    Illinois
    Mower
    kioti/rhino finish mower

    Re: Briggs 17.5 HP with Nikki Carburetor Surging only when cold . (Craftsman Lt1500

    Sounds like there may be an issue with the transfer ports. When you go from no load to load there are holes or slots that allow the engine to transfer from the idle circuit of the carb to the main jet. So your carb may benefit from some cleaning. it will look like a series of small holes, or a slot behind the hole for the needle valve in the venturi of the carb
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  4. #13

    Join Date
    May 2011
    Posts
    23
    Location
    New Jersey
    Mower
    Craftsman LT1500

    Re: Briggs 17.5 HP with Nikki Carburetor Surging only when cold . (Craftsman Lt1500

    So why hasn't any external adjustments been suggested?
    On the cold start, if I push on the choke wire a little to open it more it does not surge. Does a 6 year old carb not need adjustments or is it that a 6 year old carb is probably blocked.?
    It just seems like the suggestions jumped to a carb clean and nothing else could be the issue.

  5. #14

    Join Date
    Oct 2017
    Posts
    33
    Location
    Texas
    Mower
    John Deere, Sears, Scott, Massey gc2300

    Re: Briggs 17.5 HP with Nikki Carburetor Surging only when cold . (Craftsman Lt1500

    Maybe it's just me but i have a B&S 12 hp that does that same thing i just let it warm up and use it

  6. #15

    Join Date
    Apr 2016
    Posts
    272
    Location
    Mississippi
    Mower
    Huskee 54"

    Re: Briggs 17.5 HP with Nikki Carburetor Surging only when cold . (Craftsman Lt1500

    Quote Originally Posted by mstar View Post
    So why hasn't any external adjustments been suggested?
    I am not familiar with your carb, but most other current units which I have serviced have no external carb adjustments.....

    Valve settings are a typical issue, but you seemed to focus on the carb from the onset.

  7. #16

    Join Date
    May 2011
    Posts
    23
    Location
    New Jersey
    Mower
    Craftsman LT1500

    Re: Briggs 17.5 HP with Nikki Carburetor Surging only when cold . (Craftsman Lt1500

    Quote Originally Posted by Fragger View Post
    Maybe it's just me but i have a B&S 12 hp that does that same thing i just let it warm up and use it
    Does yours also do it as you release the clutch, even after warm?

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