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Thread: Atc 200

  1. #1
    Join Date
    Dec 2019
    Location
    USA
    --
    34

    Atc 200

    How hard is it to replace a piston in a 200? I’m interested in having a “newer” built engine in he trike cause I plan on using it a lot. Also should I consider replacing valves if they are still available for sale? I don’t have a new machine and would like to make the trike really reliable.

  2. #2
    Join Date
    Sep 2019
    Location
    Syracuse, NY
    --
    4
    Before tearing into it at all I would do a simple compression test. The 200’s were usually around 150psi factory so if you’re in the ballpark I’d say the top end is good enough.


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  3. #3
    Join Date
    Apr 2012
    Location
    MI, USA
    --
    3,645
    I agree, no point in throwing money at a problem that doesn't exist. Check your valve clearances to make sure they are adjusted to spec, then do a compression test to see how the cylinder/top end health is. If it's low, then rebuild, if not, then run it till it's low.

    Assuming by ATC 200 you have an actual ATC200 from 81-83 and not something else like a 200m, 200s etc the service manual says compression spec is 156psi +/- 14psi or 142-170psi.

    If you don't already have the service manual, download it, it's chucked full of details.

    http://www.oscarmayer.net/atc/manuals/

    Here's a screen shot of the service manual page with the compression spec and also includes the valve clearance specs.


  4. #4
    Join Date
    Dec 2019
    Location
    USA
    --
    34
    That makes sense. On this topic, is there a big bore kit available for these engines? And if so would it be much difference over stock performance ?

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