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Demistifying the ATC 200X Carburetor

This is a discussion on Demistifying the ATC 200X Carburetor within the Bigger Minis Forum forums, part of the General Talk category; For $29.95 you too could have owned this OEM Keihin PD 62B 1984 ATC200X carburetor. The weapon of choice for modest XR100 BBK builds, everywhere. ...

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    Demistifying the ATC 200X Carburetor

    For $29.95 you too could have owned this OEM Keihin PD 62B 1984 ATC200X carburetor. The weapon of choice for modest XR100 BBK builds, everywhere.



    The description read "Useable condition, for parts or rebuild. Slide is stuck down."

    We'll see about usable.

    The bowl screws had clearly not be disturbed, the bowl was good and locked in place - Good. I'd rather fight my own battles than repair the damage from someone else's ignorance anyday.

    A few healthy raps with the handle on my screwdriver knocked it loose to reveal:

    Death.



    Black tar and sludge in the bowl, not only is the slide stuck but so is the needle and float. The jets are unrecognizable studs, the fuel screw looks like a rivet with threads on it; every port is blocked, the only parts that move are the choke and the throttle cap.

    So, $29.95 plus $15 shipping (O, Canada.) = paperweight? Not a chance.

    Into the secret and mystical elixir to soak it goes.



    Double double toil and trouble... 45 min's in the soup and there's almost a creamy substance floating in the elixir.



    After 90 min's in the (margarine) cauldron, a little nudge with a popsicle stick on the base of the slide...



    and it pops right out.

    4 hours in: the float and needle are freed from their prison, all of the ports are flowing though the jets are plugged solid; starting to look not to shabby.



  2. #2
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    is twist the wrist too feel the
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    ndubstuntz420's Avatar

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    what are you using to soak it in just curious?

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    Quote Originally Posted by ndubstuntz420 View Post
    what are you using to soak it in just curious?
    He uses Pine Sol.....
    tmas





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    ndubstuntz420's Avatar

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    interesting

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    Quote Originally Posted by tmas View Post
    He uses Pine Sol.....
    tmas
    Spoiler.





    Bike RIPS with this carb installed (you'll need a slightly longer throttle cable (CR80R) too.).

    XR100 w TB 120BBK
    WB pipe
    Uni pod filter

    It's lean just off idle but should be tunable by relocating the clip (standard PD62B jets and needle, 108 main, 40 pilot).
    Last edited by theraymondguy; 05-21-2012 at 09:27 PM.

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    Looks pretty nice. Although, I'm still having a hard time believing an xr100 can "RIP", haha. Also, is the 200ES carb the same as a 200X carb?
    Keepin' the Cross in Motocross.
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    Amazing. I probably would have scrap piled that one after getting the float bowl off and seeing that. Did you replace the jets or did those come clean too after the soaking?

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    Quote Originally Posted by Branyers View Post
    Amazing. I probably would have scrap piled that one after getting the float bowl off and seeing that. Did you replace the jets or did those come clean too after the soaking?
    Had to give the pilot a poke, but the 'sol softened things up enough for pin to penetrate. I haven't finished jetting it yet (I have 6 bikes in the garage right now in various stages of repair), but it does run like a scalded cat (comparitively). I even reused the rubber bowl gasket and intake pipe O-ring.
    Last edited by theraymondguy; 06-06-2012 at 03:08 AM.

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    Quote Originally Posted by mxhideout View Post
    Looks pretty nice. Although, I'm still having a hard time believing an xr100 can "RIP", haha. Also, is the 200ES carb the same as a 200X carb?
    7 Hp, dry weight 165 Lb stock; 0.042 Hp : weight ratio
    14Hp, dry weight 170 Lb modded: .082 Hp : weight ratio

    The 200ES carb is not the same as the 200X, I do not know for sure but it may be a 22mm carb vs. the 24mm 200X carb. Still no accelerator pump, but a very satisfying bump in power without sacrifice to low end (also running lightened flywheel).
    Last edited by theraymondguy; 06-06-2012 at 02:59 AM.

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    lol, just messin' with ya. It's just that it's an "XR"... 14HP with just those mods? I thought they had a hard time getting over 10. Oh, and thanks for the help on the carb info.
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    the stock 108 main jet is too lean, or at least in my case it was, you will probably end up with a 118-128 main, I'm at 4200 ft elevation and had the fastest top speed with GPS with a 122 main jet.

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