CB125S runs rich

CB125S runs rich

This is a discussion on CB125S runs rich within the Technical forums, part of the Caferacer.net Forums category; I have a 1975 Honda CB 125S it is a great little bike and my 11yr old is chomping at the bit to ride it. ...

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  1. #1
    Junior Member Thickshady's Avatar
    Join Date
    Nov 2009
    bixby, Oklahoma, USA.

    CB125S runs rich

    I have a 1975 Honda CB 125S it is a great little bike and my 11yr old is chomping at the bit to ride it. it runs fine until it gets warm and then refuses to idle. I have adjusted the idle but think think it has a rich mixture. I have heard about the ethanol in gas on older motocycles, but hell were these meant to run on leaded fuel? Any how can anyone show me how to adjust the air fuel mixture right so I can get my kid to ride it with out having to mess with the throtle at a stop?

  2. #2
    FR is offline
    Senior Member FR's Avatar
    Join Date
    Nov 2004
    Essex Jct, VT, USA.
    I had one of those and I frigged around with it for quite awhile, adjusting air screw and slide stop, couldn't get it to idle reliably until I replaced the throttle cable, then it was fine.


  3. #3
    Senior Member jaguar's Avatar
    Join Date
    Dec 2005
    Albany NY
    you have the proper filter on the bike?
    points valves and the rest are all good?

    I am Derby\'s Bitch

    Some times things come around that are so singularly inept it gives you a whole new appreciation for the ept

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