Spring-loaded Float needles, why?

Discussion in 'The Garage' started by Quickv4, Feb 19, 2013.

  1. Quickv4

    Quickv4 Pro Turd Polisher

    Joined:
    Jul 5, 2009
    Oddometer:
    550
    Location:
    Dickinson, Nort' Dakohtah- Orig. from Wiscowsin
    Some bikes have them, some dont. What is the purpose of the little spring loaded tangs, pins, and balls on the end of some float needle valves? Why do some carbs feature them, and some don't? What do the exactly do?
    #1
  2. CycleDoc59

    CycleDoc59 Wrench Rider

    Joined:
    May 24, 2006
    Oddometer:
    984
    Location:
    East Virginia
    Bumpy roads or terrain cause the float to bounce. The spring-needles keep the
    bowl from overfilling due to the float bounce....
    #2
  3. bwringer

    bwringer Gimpy, Yet Alacritous

    Joined:
    Jan 22, 2008
    Oddometer:
    2,279
    Location:
    Indianapolis
    The springs also keep the needle tip from pounding itself senseless against the seat.
    #3