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Thread: ATC70 carb adjustment

  1. 07-24-2003, 04:33 PM #1
    Joel85350X
    Joel85350X is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    ATC70 carb adjustment

    How many turns out does the gas screw go for a decent running engine on a 1085 ATC70? I have it at 1.5 turns, but it will run for about 4 minutes then it runs out of gas, and if I let it sit, it will fire up and go again for another 4-5 minutes. Any takers?
    Joel Morris
    ------------------------------------------
    Purdue University Graduate Student
    Mechanical Engineering Technology
    1985 ATC70
    web.ics.purdue.edu/~jsmorris
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  2. 07-24-2003, 09:36 PM #2
    bobr
    bobr is offline First Time Rider Arm chair racerNew to the board
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    carb

    Could it be that the tank isn't venting? One and a half turns seems about right.
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  3. 07-25-2003, 12:02 AM #3
    Joel85350X
    Joel85350X is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Well, I figured it out. Bobr was right, it was not benting propperly. I did end up adjusting the screw a little more, but it was mostly the on/off switch on top of the fuel fill cap. I had no idea that the "on" and "off" meant for airflow. For those of you who didn't know, the "off" position should actually form a vapor lock in the tank, and the "on" position should allow sufficient air to enter the tank. I may have just reinvented the wheel. I was really happy to figure it out, because this thing is really running great, and the spark plug is perfect.

    I even got my wife to ride it around for a few laps around the house. Her first time on any motorized fun machine. She is hooked. However, she is not very happy at how I ride the little guy around, what with laying off the side to corner correctly, and bump-jumping it on the edge of the asphalt at the street. I'm such a kid.

    Anyone want to race? :-P
    Joel Morris
    ------------------------------------------
    Purdue University Graduate Student
    Mechanical Engineering Technology
    1985 ATC70
    web.ics.purdue.edu/~jsmorris
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  4. 07-25-2003, 12:05 AM #4
    bentwrench
    bentwrench is offline At The Back Of The Pack Arm chair racerFirst time rider
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    from a 350 custom to this??
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  5. 07-25-2003, 06:31 AM #5
    Joel85350X
    Joel85350X is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Hey dude, I plan on bouncing back. I have a dune buggy, my ATC 70, and a Honda 350Four motorcycle keeping me company now. I am moving from a low paying university job to a corporation...lets just say I plan on having a nice toy in the near future.
    Joel Morris
    ------------------------------------------
    Purdue University Graduate Student
    Mechanical Engineering Technology
    1985 ATC70
    web.ics.purdue.edu/~jsmorris
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