Motorized Bicycle Carburetor pictures how to install and rebuild

Discussion in '2 Stroke Bicycle Engines & Kits' started by Norman, Jan 22, 2008.

  1. BikeBerry.com

    BikeBerry.com Dealer

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    Re: Carb pictures how to

    I really like how not only are you taking pics of everything, you have them on a white board and breaking down everything! your efforts are super awesome and really helpful! Keep being great!.trlrl.
     
  2. bikenovice

    bikenovice New Member

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    Great explanation but my engine won't start. I have gas, a good spark but after trying to start and immediately removing the spark plug it seems rather dry; like the fuel is not getting to the cylinder. The carburator jet seems clear and there is fuel in the bowl (maybe not enough?). It seems like the engine tries to start when I pop the clutch and tries harder when I open the throttle, even wide opened it tries a little harder while I'm pedaling like crazy but it quits when I stop pedaling. HELP.
     
  3. tooljunkie

    tooljunkie New Member

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    firstly,bikenovice welcome to the site.
    second,please take a look at forum rules and introduce yourself as requested by the moderator(s).
    it is always helpful to mention the type of engine you are running,as well as carb type/model so we can give you useful advice.

    carb may have dirt lodged in the main jet,preventing fuel from travelling up the venturi.
    choke lever(if its the carb im thinking of) should be up for a cold start,and down as soon as it fires.
    going to need more info before we can go any further.
    new build,or old build and been sitting....
     
  4. tooljunkie

    tooljunkie New Member

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    carb cleaning:

    i just tried soda blasting a carb.i'm amazed at the speed and the results an inexpensive portable sandblaster filled with baking soda will achieve.
    here's the one i used,i bought it when it came on sale.http://www.princessauto.com/pal/pro...rs/18-oz.-Hopper-Gravity-Feed-Sandblaster-Gun

    should have taken photos,it was a honda carb,gooey and sitting for three years.
    it cleaned the jet spotless in seconds.used about 50 cents in soda to clean whole carb.
    dust mask and do it outside.
    awesome awesome.
     
  5. NorthEastRiot

    NorthEastRiot New Member

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    Thank you for this, I will be attacking it Friday!
     
    #125 NorthEastRiot, Sep 20, 2012
    Last edited: Sep 20, 2012
  6. JonnyR

    JonnyR New Member

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    Re: Carb pictures how to

    some one needs to make s spell checking white board what dosent get eaten by fuel for these sort of tutorials its a nice job though teaching the inner workings of the carb on these now you just need to post how to make the stupid CNS and cable choke NT work good
     
    #126 JonnyR, Sep 20, 2012
    Last edited: Sep 20, 2012
  7. Huffydavidson

    Huffydavidson STREETRACER/MANUFACTURER

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    The solution is throw the CNS in the recycle bin because that's all it's good for . Then go by yourself a RT from DAX.com . The CNS is a over jetted air leaking untunable mystery carburetor .CNS is what it says it is . "C"an "N"ot"S"service carb.
     
  8. MEASURE TWICE

    MEASURE TWICE Active Member

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  9. MEASURE TWICE

    MEASURE TWICE Active Member

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  10. Huffydavidson

    Huffydavidson STREETRACER/MANUFACTURER

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    good luck with that
     
  11. sputterputtBAM

    sputterputtBAM New Member

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    It works fine and idles nice even without the governor on it. I would have kept the governor on it but the elbow 90 degree bend I used on the intake manifold made it a rather difficult task if I were to try. One thought was to use electronic sensors and servo motors to make the connection as they go around corners without bending....... part of quote by measure twice

    That seemed to be a LONG ramble without relevance to the thread. All about 4 stokes, governors, ect. This is concerning the basic 2 stroke carb.

    You do seem to know what your talking about though, just misplaced maybe. I was confused.
     
    #131 sputterputtBAM, Dec 12, 2012
    Last edited: Dec 12, 2012
  12. MEASURE TWICE

    MEASURE TWICE Active Member

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    ========================================

    Question moved to new thread of mine, sorry!

    removed and moved to http://motorbicycling.com/showthread.php?p=446651#post446651

    MT
     
  13. ken murphy

    ken murphy New Member

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    yamaha pw 80 carb works best,but they blow off, my fix as always make my own out of a handle bar.xct2
     

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  14. Dogtown Burner

    Dogtown Burner New Member

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    must say I got a good giggle on your CNS description. (not the last bit) I agree, and the most ridiculous is the non adjustable needle. i mean, really?! oh wait, and the claims by vendors "racing carb"!!!
    Now, one thing i did find- I bored out a cylinder to the physical limitation of the cylinder. I added a huge pipe (KX 65) and I found that the super rich CNS actually helped reduce the ridiculously lean condition i had created. I only used it for a minute because I flat out didnt want all the cables and the lack of adjustability. I am going to try this PW 50 idea, although fyi we have been using mikuni 18mm carbs for our racers. "dream carb". makes the bike like a kx-60. although not for the carburetor theory & tuning inclined. overly adjustable, with a fair amount of balance when making a jet adjustment. it is unique in that the pilot jet is always in play, so it affects the mixture curve throughout the rpm curve. anyway, sorry for the ramble I'm not awake, but get a mikuni if you want real power and performance fellas.
     
  15. nikymor

    nikymor New Member

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    has anyone tried putting a fuel pump for ht 49cc engines? what size of carb is best used for the china 49cc engine? a 21mm or a 22mm? im from the philippines and i just recently bought a bike engine kit,havent started yet on the build because tha bike shops here are still closed, although ive been compiling stuff here so when im all set il be doing the tips ive gathered here and post some screenies.which some topics lack, so il just link them up ^^ for newbies like me,thanks in advance more power god bless
     
    #135 nikymor, Jan 4, 2013
    Last edited: Jan 4, 2013
  16. nikymor

    nikymor New Member

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