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Thread: Atc 125m won't idle

  1. #1
    Join Date
    Aug 2012
    Location
    johnsburg ny
    --
    61

    Atc 125m won't idle

    I have a 1983 atc 125m and it will not idle at all and I have had the carb totally cleaned
    A couple times and I have turned the idle screw all the way in and it doesn't do anything.
    Any suggestions?

  2. #2
    Join Date
    Nov 2010
    Location
    Oshawa, On, Canada
    --
    2,123
    You have a few possibilities, Pilot jet could still be clogged. Plug could be fouled, air filter could be mega dirty, bad gas, low compression...
    1985 Honda 250r x2
    1986 Honda 250r
    1986 Honda 250sx
    1985 Honda 250sx x2
    1985 Honda 350x x2
    1986 Honda 350x
    1984 Honda 125m x4
    1983 Honda atc 70 w/ Lifan 125
    1984 Honda atc 70
    Yamaha tri zinger
    Yamaha 4 zinger
    Brap braaaap

    http://www.youtube.com/user/3wheelsoffroad

  3. #3
    Join Date
    Feb 2011
    Location
    fingerlakesny
    --
    2,835
    yep, what jason said.... 1 little itty-bitty piece of dirt wwill cause a problem in a carb... good luck
    our original 85 we bought new, 2 - 86 police specials
    250r dust runner
    04 Yamaha kodiaK 450 snowbuster ! Brute Force 750 dust collector .
    Bunch of es stuff I been buying for next builds....
    Gone but lives on in my aching body the mighty 350x collection . A Beat 85 es im gonna rebuild

  4. #4
    Join Date
    Aug 2012
    Location
    johnsburg ny
    --
    61
    Ok thank you I will try all of what you said

  5. #5
    Join Date
    Aug 2008
    Location
    MN
    --
    3,260
    Sounds like you still got something plugged up, its a pain. I took a 125 carb apart three times before i finally got that sucker to work right once. The third time i said the heck with it and soaked it in carb dip for two days then blew it out and baked it under a heat lamp for an hour and blew it out again, it must have worked cause after i put it all back together it ran good.

    On the other hand, i just had another 125 that i could not get the carb to work right on no matter what i did. I ended up buying a new replacement carb off ebay, then i had a racing idle. Ended up being the gaskets between the carb and the intake and the intake and head if you also removed the intake tube to get the carb off, i know when i take apart a 125M i take the two bolts out of the head end of the intake and take the carb and intake off as one piece. Turns out it was just an air leak. I ended up making two new gaskets from a sheet of gasket material and a new o-ring for the front of the carb from the hardware store and it purrs like a kitty now.
    ---------------------------------------------------------
    1984 Honda ATC200ES "Big Red"
    1982 ATC200E "Hondie"
    1988 TRX300FW "Project Quad" Still in progress....

  6. #6
    Join Date
    Jun 2018
    Location
    Holland Mi
    --
    93
    So then is the carb screw towards the engine the idle mixture screw and the one towards the air cleaner the idle screw ?

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