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Thread: Need some help on the 200x top end on a 200 auto.

  1. #1
    Join Date
    Jan 2010
    Location
    here
    --
    1,336

    Need some help on the 200x top end on a 200 auto.

    I have an 85' 200x motor for parts. And currently in my daughters 85' x is an 81' 200 seized up I think (can't pull the cord even). Want to get the top end of x put on the semi-auto bottem end at my old school shop. That way they can check for thing that may be worn etc.. I don't quite have the confidence to do this for my daughters bike. My question is this: Does the whole piston clear down go on? Will the wrist pin and everything hook right up? Just was asking what all needs to be done here. I'm sure the old mechanic will not have a problem, but I'd like to be able to expain what was done by the other members here. I can't find a link on it with pictures. Thanks fellas. I'll run it in tomarrow after I get all the info from you guys.
    83' 200x (son's). 85' 200 auto-x & 85' 125m (daughters). 84' Tecate(?). 85' KXT Tecate (mine!, mine!, mine!.)+ some others but don't feel like typing them in.

  2. #2
    Join Date
    Jan 2010
    Location
    Beaver Falls, PA
    --
    2,666
    Funny you should post this now... I was just thinking the same thing (200x top end on an S bottom). Looking forward to seeing some expert's replies!

  3. #3
    Join Date
    Dec 2007
    Location
    Quebec,Canada
    --
    1,014
    All parts are direct fit....the difference between 200x head/cylinder and other 200 is the dimension on the cooling fines...
    The angle and the duration of the cam is slightly differents,you can mix all part with other,no problem

    1986 ATC500X
    1985 ATC250SX
    1985 ATC200X
    1985 ATC250R
    1986 ATC250R
    1984 ATC250R
    1981 ATC70
    1984 ATC70
    1985 ATC70
    Custom built ATC70 / 250R laydwon swap
    1986 ATC250SX FATCAT

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