The Carb

Discussion in 'Motorized Bicycle General Discussion' started by Jim C, Aug 30, 2010.

  1. Jim C

    Jim C Member

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    I took the bike out for it's first long ride, well about 20 miles. By the time I got home the idle was at about way too fast. I discovered that the whole top of the carb had unscrewed. I have always thought there was an air leak & it always idled too fast, the air screw did nothing. After fixing the carb I was able to set the idle. I road it for a few miles this morning & am very happy. These concentric float, cable slide carb used to be a main stay of motorcycling. Most have 3 circuts 1. the idle or float lift 2 the mid range or needle circut 3 the high speed circut or main jet. They usually have a stop or idle adjustment. This little carb has no idle adjustment except for the cable adjustment. The air screw probably is for low speed to mid range tunning. I did use it to bring down the idle and it all seems ok. It runs a little rough at 10 mph or so then smooths out over 15 feels good with a load on it. With the gas on it pulls right through the rough spot. Unfortunatly 10 to 12 is a good bike lane speed. I will get this all dialed in.

    Jim C
     
  2. Jim C

    Jim C Member

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    That should be The Carb
     
  3. Nougat

    Nougat New Member

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    The screw on the side is your idle screw. All it does is prevent the throttle slide from closing all the way, with a pointed inside end. There is no air screw. As you know, there's no pilot circuit, either. Single jet, with a tapered needle to marginally adjust fuel flow between about 20% and 80% throttle. There's really no simpler carb.
     
  4. r00t4rd3d

    r00t4rd3d New Member

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    If you want to be able to tune your carb get a Mikuni 18mm off ebay. They are the same price as the "Racing Carbs" but alot better product.

    :)
     
    #4 r00t4rd3d, Aug 31, 2010
    Last edited: Aug 31, 2010
  5. Mind_Reader7

    Mind_Reader7 New Member

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    The thread title sounds like a movie.

    One man, one dream. To create a bicycle faster than ever before....
    Jim C.......THE CARB
    Coming to a theater near you.
     

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