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Thread: 1982 atc185s, teach me something.

  1. #1
    Join Date
    Aug 2018
    Location
    Little Rock, Arkansas
    --
    13

    1982 atc185s, teach me something.

    I have a little 185, ive had it for about to years. Finally got it running right, but im curious what kind of options do i have?

    It has a .75 over bore mid 2mm over lift cam. And a hefty gear reduction(6.13 is the current gear ratio) on 25" tires.

    Do i have any head options? Larger valves, port and polish maybe? 4 valve? Any clutch options? Can you stroke it? Are high compression pistons worth it?

  2. #2
    Join Date
    Apr 2012
    Location
    MI, USA
    --
    3,093
    Building up an engine is pretty expensive, just personal opinion, but I'd start with a more sporty machine if you prefer speed, or a more utility & shaft drive machine if you prefer mud and such. A stock 350x is a torque monster, does exactly what you tell it to do, etc, my fav machine. If you like utility, check out a 250es or 250sx.

    Not saying the 185 is a waste or anything, just before you spend a buch of time/money on it, just making you aware of other options.

    Anyway, the 185 is effectively a 200/200s engine, a fair few parts interchange, and you can switch the top end & piston over to turn the 185 into a 200. The 200x cylinder has the biggest fins for the best cooling. There was a some 200 series motorcycle engines that should be similar, like the XR200 and XL200, don't know much about them but might be a place to look for performance parts. I think the cam interchanges, but the over board kind of goes to waste if you change out the cylinder.

    I don't follow the 200 series models as much as the others, I personally target 250cc+ models only for keeping, anything smaller I buy to part out or fix up to sell. I suspect you can push a 200 series engine pretty good for power, but expect to pay for it too. Easiest upgrade is displacement though for power.

  3. #3
    Join Date
    Jul 2009
    Location
    South Florida
    --
    5,874
    This is my 185s , read up , lots of options for your machine .
    http://www.3wheelerworld.com/showthr...ull-Suspension
    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

  4. #4
    Join Date
    Aug 2018
    Location
    Little Rock, Arkansas
    --
    13
    Shortline10 that machine is amazing! So engine build recap:
    - 200x jug '81-'85
    - .435 megacycle cam,
    - ported head
    - 24mm Mikuni Sudco carb w/ K&N filter
    - super trap exhaust
    - barrnet hd clutch kit

    What kind of piston are you running. Wiseco? Cr? 10.25:1 or 12:1? What bore size? BAPP Copper head gasket? Oversized valve heads?

    My bike is used for fast paced mountain/back country trails and mudding with large tires 25" now. About the go to 30s, i have an adequate gear reduction (roughly 60% at the chain).

    Do you think a build similar to your set up, would function reliably and fit my application appropriately?

  5. #5
    Join Date
    Apr 2012
    Location
    MI, USA
    --
    3,093
    FYI, the 200X was only made 83-87, guessing the 81 was just a mistype for 83 though. Just trying to help keep data accurate on the site.

  6. #6
    Join Date
    Aug 2018
    Location
    Little Rock, Arkansas
    --
    13
    Sorry i actually meant 83-85. In 86 i think they changed the head shape and design and the stroke length

  7. #7
    Join Date
    Apr 2012
    Location
    MI, USA
    --
    3,093
    Yea, 86-87 200x was basically a redesigned engine. I don't think it's the same "family" of engine as the other 200 series engines.

  8. #8
    Join Date
    Jul 2009
    Location
    South Florida
    --
    5,874
    26mm vm mikuni carburetor with mossburger intake manifold
    Wiseco 10.25 piston std bore


    Very reliable and fast .

    I could have gone a little more aggressive with a 28mm mikuni and 12.1 piston but didn’t want to have to run race fuel .




    Quote Originally Posted by Laredo View Post
    Shortline10 that machine is amazing! So engine build recap:
    - 200x jug '81-'85
    - .435 megacycle cam,
    - ported head
    - 24mm Mikuni Sudco carb w/ K&N filter
    - super trap exhaust
    - barrnet hd clutch kit

    What kind of piston are you running. Wiseco? Cr? 10.25:1 or 12:1? What bore size? BAPP Copper head gasket? Oversized valve heads?

    My bike is used for fast paced mountain/back country trails and mudding with large tires 25" now. About the go to 30s, i have an adequate gear reduction (roughly 60% at the chain).

    Do you think a build similar to your set up, would function reliably and fit my application appropriately?
    Last edited by shortline10; 06-23-2019 at 01:19 AM.
    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

  9. #9
    Join Date
    Aug 2018
    Location
    Little Rock, Arkansas
    --
    13
    On the megacycle .435 cam, is the needle bearing kit they offer worth it, or is it a waste of money? Apparently the kit comes with a new mounting plate and 2 needle bearing no machining required.

  10. #10
    Join Date
    Jul 2009
    Location
    South Florida
    --
    5,874
    The 435 roller cam is a very nice part .
    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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