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Thread: 250r Engine Swaps?

  1. #1
    Join Date
    May 2023
    Location
    Watertown, SD
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    1

    250r Engine Swaps?

    I am new to doing these kinds of things and I am putting together a 1983 250r, are there any other engines that would bolt directly in or does it have to be a 250r motor? Any advice (about anything) would definitely help! TIA

  2. #2
    Join Date
    Apr 2023
    Location
    New Hampshire, USA
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    18
    Do you have the old motor for it?

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  3. #3
    Join Date
    Apr 2019
    Location
    South Dakota
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    248
    I see your from Watertown SD, me too! I assume your the guy my gf told me was asking questions 250r questions.


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    Currently : trx400fw, ct70, 250es,200x, xl80s, 350x, 350x, 225DX, trx300

  4. #4
    Join Date
    Apr 2019
    Location
    South Dakota
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    248
    As for bolt in engines, 1981-1984 atc250r will. The hard part about finding engine to swap is that the air coolers have the chain on the right side of the engine.


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    Currently : trx400fw, ct70, 250es,200x, xl80s, 350x, 350x, 225DX, trx300

  5. #5
    Join Date
    Jul 2005
    Location
    Manheim, PA
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    5,741
    flip the axle.

  6. #6
    Footy's Avatar
    Footy is offline At The Back Of The Pack Arm chair racerAt the back of the pack
    Join Date
    Feb 2015
    Location
    Charlotte, N.C.
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    294
    There is an issue with the fitment of the shifter when switch between gen 1 & 2 engine/frame. I think one of the shift shaft is longer on one than the other.
    Put your butt on the inside fender or end up on the ground!

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  7. #7
    Join Date
    Apr 2019
    Location
    South Dakota
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    248
    Quote Originally Posted by Footy View Post
    There is an issue with the fitment of the shifter when switch between gen 1 & 2 engine/frame. I think one of the shift shaft is longer on one than the other.
    This is true, I completely forgot about it. Been a while since I’ve been around the air cooled 250rs.
    I’ve also seen guys that have used the cr250 engines that are air cooled, but IIRC the exhaust port is not going to line up (maybe it was intake side?), as well as the kickstarter will go the wrong way for a trike.


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    Currently : trx400fw, ct70, 250es,200x, xl80s, 350x, 350x, 225DX, trx300

  8. #8
    Join Date
    Sep 2009
    Location
    Suring Wisconsin
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    967
    you will want to find an 81-84 R engine 81-82 same shift shaft and shifter, 83-84 same shift shaft and shifter. 81-82 red, 83-84 black. 83-84 shifters are expensive and hard to find perfect. Do you have any of the oem engine?
    Rebuilding and riding trikes everyday and lovin every minute.


    http://www.3wheelerworld.com/showthr...light=pipeline

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