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Thread: 84 and 85 200M

  1. #1
    DDQ's Avatar
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    84 and 85 200M

    Hello. I have just acquired an 84 and 85 200M. They have sat in a conex box for many years. The owner has had them both for a very long time and gave me great details on them both. He said both smoked when he pulled the motors and I can see scars on the pistons. He said the 85 has slight play in the crank rod and that I should not run it like that. He says the 84 has a trans that is neutral at the top and the 85 is neutral at the bottom.
    I dont mind doing a case split but I'd rather not if necessary and my plan is to make one rider out of the two.
    My questions are:
    Is there any reason I should spit the cases on the 85 motor and replace the crank in addition to replacing the top end? My current plan is to simply replace the top end on the 84 and pit it in the 85 chassis. Also, other than the trans being different, are all other motor parts interchangeable between the 84 and 85? Thanks!

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  2. #2
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    Check the cranks for any up and down play , side to side play is ok . Any up and down play and the rod will need replaced .
    Parts should all interchange .
    Honda changed to the up shift in 1985 so children couldn’t jump on the machine while running and easily shift it by standing on the shifter , dangerous.
    78 atc 90/180cc Dickson Full Suspension
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    84 KLT 110/123cc Powroll Racer from 80s
    87 atc 125m stock
    84 atc 200x Curtis Sparks
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  3. #3
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Quote Originally Posted by shortline10 View Post
    Check the cranks for any up and down play , side to side play is ok . Any up and down play and the rod will need replaced .
    Parts should all interchange .
    Honda changed to the up shift in 1985 so children couldn’t jump on the machine while running and easily shift it by standing on the shifter , dangerous.
    Interesting fact!! Thanks

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  4. #4
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    Any idea what the black stenciled letters and numbers on the fuel tank are from? A motorpool? The air pressure decal seems like a motorpool thing too.
    The story of three wheels and a man...

  5. #5
    DDQ's Avatar
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    Quote Originally Posted by ATC King View Post
    Any idea what the black stenciled letters and numbers on the fuel tank are from? A motorpool? The air pressure decal seems like a motorpool thing too.
    I don't know but I can ask the seller. What is a motorpool?

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    A motorpool is where they fix vehicles in the military.

  7. #7
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I want to go ahead and order a piston so I can take it to a machine shop with a cylinder for boring. Both cylinder bores measure between 64 and 65mm. Does that mean both cylinders are on the original bore and is the first step up to a 65mm piston?

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  8. #8
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    Std bore on a 185cc motor is 63mm and a std bore on a 200cc is 65mm
    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
    DDQ's Avatar
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    .

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  10. #10
    kiser's Avatar
    kiser is offline Just Too Addicted Arm chair racerJust too addicted
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    Lol that's a brutally honest and funny sticker!

  11. #11
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    From the decal, trikes were the last hurrah for natural selection.


    That makes sense why the guberment had to intervene. Can't have the useful idiots killing themselves off.
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  12. #12
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I have started tearing down the 85 and I dropped off the cylinder at a machine shop for boring.

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  13. #13
    BarnBoy is offline Just Too Addicted Arm chair racerJust too addicted
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    I have a 84 200M build thread and pictures of the engine build etc. Go check it out, May be some useful info for you. I also have a fork rebuild writeup when that time comes.
    1984 HONDA ATC200M - OG, mid-restoration
    1981 HONDA ATC200 - future build
    1981 HONDA ATC185S - parts
    1984 ATC200X - roller, future build
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  14. #14
    DDQ's Avatar
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    Quote Originally Posted by BarnBoy View Post
    I have a 84 200M build thread and pictures of the engine build etc. Go check it out, May be some useful info for you. I also have a fork rebuild writeup when that time comes.
    I found your fork rebuild thread but can't find the 200m build thread. Can you post the link?
    Thanks!


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  15. #15
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    I've got the 85 stripped down as far as I'm going to take it. I'm going to wire brush/wire wheel on a drill the frame and paint it black. It's pretty pitted around the rear.

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