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Thread: Will an 85 ATC250R motor work in a 88/89 quad?

  1. #1
    BIGKAHUNA is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Nov 2002
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    220

    Will an 85 ATC250R motor work in a 88/89 quad?

    Was just wonderin if it will bolt in with no mods. Are the quad motors stronger? What are the differences between the 2?

  2. #2
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    3,658
    The 85 motor is identical to the 86-87 except it has a slightly higher compression ratio.
    '02 Honda 416ex - A seasoned blend of 11 herbs and spices
    '04 Honda Recon - The yard machine and snow plow
    '88 Honda CR250R - Another chapter in my torrid all terrain affair

  3. #3
    dogger is offline At The Back Of The Pack Arm chair racerFirst time rider
    Join Date
    Sep 2002
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    203
    in answer to your question, yes it will. the differnce will come when you mount your motor in you won't be able to make use of your rear engine mount. there are still three other mount's you will use just not the rear. that is all because they canged the swing and the swing arm mount in 88.

  4. #4
    Join Date
    May 2002
    Location
    Southeastern Wisconsin
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    They all have those extra holes. 88-89 had them too but didn't use them.
    '02 Honda 416ex - A seasoned blend of 11 herbs and spices
    '04 Honda Recon - The yard machine and snow plow
    '88 Honda CR250R - Another chapter in my torrid all terrain affair

  5. #5
    Join Date
    Sep 2002
    Location
    New Hampshire
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    794
    To clarify, the motors are NOT identical. Honda made subtle improvements to the engine throughout its production run. I will not go into details, but I can assure you the Atc engine (85 or newer of course) will bolt right into any Trx250r chassis.

  6. #6
    Join Date
    Sep 2002
    Location
    Clarks Summit PA
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    1,236
    yepper... they will bolt right in.. that is why you see the rolling chassis's for sale for the atc 250r.. they steal the motors from the atc's to put in the trx...
    Ride it like you stole it! And never look back! They are too far behind to see!

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