Just some updates on the Carburetor
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Thread: Just some updates on the Carburetor

  1. #1
    Senior Member jannaruto's Avatar
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    Just some updates on the Carburetor

    Hey guys,

    I was playing a bit with the carb in the last days, new gaskets etc
    When I put it back I inserted first the boot to the airbox and then the engine side, I wanted to make sure that the airbox to carburetor part was completely sealed and well connected right? Keep also in mind that my carburetor had the pilot screw set to 3,25 turns out to run perfectly

    So as said I wanted to make sure the seal was good so I inserted as best as possible and then tighten the screw of the clamp

    The bike started to run, but not in a very good way, I tought, oh well, I spent a lot of time on the bike it must be cold, infact after a while it started to run good until next day, I was not able to keep the bike turned on without a huge amount of choke and sometime when coming to a stop the bike will die

    Rush to the box, remove the sparkplug and what I discover? A completely black sparkplug, I mean Batman suit is probably white compared to that spark haha
    So I had my assumption that I had a proper and very very good seal with the airbox boot (which as you may know is somewhat short) so I lowered the pilot screw to about 2,25-2,50 turns out, bike runs awesome again

    This is probably just a suggestion thread then, when you deal with carburetor, like moving, twisting etc, make always sure that you maybe check the sparkplug after, a small leak of air could make the mixture lean or maybe you manage to close even better the seal and the mixture could be very rich suddenly



    EDIT: Keep in mind that the last time I tocuhed the carburetor was like 1 month ago and the bike has been running great since then, after messing with it I managed a better seal and had to readjust the mixture
    Howsbentley and admiral like this.

  2. #2
    Senior Member RockyTFS's Avatar
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    A very good point, and for any repair/tune/R&R, it's a good idea to just stand there for a moment or two and think about what might have gotten moved, twisted, cut, punctured, forgotten, or whatever during the operation that you may not have noticed. And another hint: The very most likely time that this may happen is when you allow someone or somehing to interrupt your work! I lock the barn door and don't answer the telephone!
    Rocky
    2018 TW200
    2014 BMW R1200GS LC

  3. #3
    Senior Member SportsterDoc's Avatar
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    Intake leaks are much more common than generally realized.
    When inserting a carb into a rubber boot, it is a very good idea to lubricate the contact surface(s) with a little water, diluted soap or even spit.
    When the pilot jet orifice is clear, the pilot jet is a "normal" size for altitude, then having to go to 3 turns plus is generally an indication of an intake leak.
    2014 Honda CB1100
    2018 Yamaha XT250
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    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

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