20mm Carb info?

Discussion in 'Performance Mods' started by azbill, Apr 6, 2008.

  1. azbill

    azbill Active Member

    I need some help finding out what carb I have
    I bought 2 carbs off of e-bay for 26$ (shipped)!!!
    they are supposed to be 16mm, but I measured the opening and get 20mm
    I e-mailed the guy I got them from, but still haven't got a reply
    this link is the same set,
    when they came there were 2 hoses connected...
    one was at the top beside the slide (which I assume is fuel inlet), the other is coming off the bottom of bowl, the use of, I'm not sure
    there is also a petcock on the side of the bowl, which I think is for draining
    I also am going to make up a thumb-shifter type deal for the cable actuated choke :D
    if anyone can help with any of my questions, or tell me where to find info I would be very greatful

    the markings on the side say 'Sheng Wey' with a large K in the casting
    the rest of the markings are printed:
    TBT125 1J07
    0310 0721
    there is also a large 'K' at the front of the above numbers, and the same size '11', at the end
    pics below

    Attached Files:

  2. azbill

    azbill Active Member

    thread title error

    could a mod please edit the title to show 20mm please
    ...brain fart on my end :lol:
  3. Abeagle

    Abeagle Guest

    From the pictures I can tell you the hose on top is for the throttle cable and the one on the float bowl is the fuel inlet with a built in shutoff valve.
    The small outlet on the float bowl is probably a float bowel over flow outlet, you should have a hose on that drops down below the bottom bracket to dump fuel over flows in the float bowl
    Last edited by a moderator: Apr 6, 2008
  4. wildemere

    wildemere Member

  5. wildemere

    wildemere Member

    Its measured at the narrowest part of the venturi, not an easy place to measure without an engineers inside micrometer.

    Do you understand the venturi effect? Its how carburettors function.
  6. fastboy9

    fastboy9 Member

    Nice looking carbs, ye that other pipe is definetely a fuel overflow to stop it flooding, I've seen them before on pocket bikes
  7. Where is this going to? A Happy Time?

    I would imagine even a carb bigger than 20 would still work,cause like in cars,you can get a bigger carb than what the engine needs,which is usually what gearheads do.
  8. azbill

    azbill Active Member

    LF, yes, it's going on a 70cc livefast engine
    already made a plate to be welded on a steel manifold so we can bolt it up
    hope to get it welded, mounted and tested tomorrow
    I will let everyone know if it works or not
    seemed like a cheap enough experiment
  9. fastboy9

    fastboy9 Member

    Any luck with the carbs? Look forward to hearing the results, they look really smart too
  10. alex

    alex Guest

    do you have a tuned pipe? I have to know how the combo of a performance carb and a tuned pipe is.