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Thread: '84 200x rebuild questions

  1. #1
    Join Date
    Apr 2023
    Location
    New Hampshire, USA
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    18

    '84 200x rebuild questions

    To start with, where do these o-rings go? There were 2 of them and I apparently missed them on disassembly. They were stuck to the inside of one of the case halves but that was after boxing up a bunch of parts to wash in the big tank at work.

    Sent from my SM-S908U using Tapatalk

  2. #2
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    There are only 3 o-rings that size that I can recall , 2 are under the pressed in valve guides and the other one goes between the cylinder and cylinder head on the oil galley stud .
    Part number 3

    https://www.partzilla.com/catalog/ho...00x-a/cylinder
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

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  3. #3
    Join Date
    Apr 2023
    Location
    New Hampshire, USA
    --
    18
    Quote Originally Posted by shortline10 View Post
    There are only 3 o-rings that size that I can recall , 2 are under the pressed in valve guides and the other one goes between the cylinder and cylinder head on the oil galley stud .
    Part number 3

    https://www.partzilla.com/catalog/ho...00x-a/cylinder
    Yeah I saw that when I looked at the parts fiche. You know what I think happened? Someone put two under the head. They stuck to the head when I took it apart and fell off into the case when I boxed them.
    Ok... what is the oil galley stud and does the o ring go under or on top of the head gasket?

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  4. #4
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    The bottom right cylinder stud feeds oil to the top of the head . Place an alignment dowel and one o-ring there .
    The original head gaskets are made a little larger to accept that o-ring . Now if you’re using an OEM newer style metal head gasket I believe it doesn’t use that o-ring anymore .
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

  5. #5
    Join Date
    Apr 2023
    Location
    New Hampshire, USA
    --
    18
    Quote Originally Posted by shortline10 View Post
    The bottom right cylinder stud feeds oil to the top of the head . Place an alignment dowel and one o-ring there .
    The original head gaskets are made a little larger to accept that o-ring . Now if you’re using an OEM newer style metal head gasket I believe it doesn’t use that o-ring anymore .
    Awesome. Thanks for the info!

    Sent from my SM-S908U using Tapatalk

  6. #6
    Join Date
    Nov 2022
    Location
    Crompton Park Mass
    --
    8
    That Oring might be from timing chain tensioner adjuster, or the plugs to check timing on Mag cover maybe. there are also 2 behind oil pump.

  7. #7
    Join Date
    Jul 2009
    Location
    South Florida
    --
    6,722
    Good call on the two behind the oil pump , I believe those two are much smaller than the one in his picture though .



    Quote Originally Posted by bt200X View Post
    That Oring might be from timing chain tensioner adjuster, or the plugs to check timing on Mag cover maybe. there are also 2 behind oil pump.
    78 atc 90/180cc Dickson Full Suspension
    76 ATC90/180cc Nicholson
    77 atc 90 Dickson Full Suspension
    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
    84 atc 200x Powroll My race bike from 80's
    83 atc70/108cc Powroll blue Xmas Special
    81 atc185s HP-ATC full suspension

    Performance Shop is Open PM me for Service

    My Feedback http://www.3wheelerworld.com/showthr...ck+shortline10

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