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Thread: Will 86-87 TRX 250R motor also fit 85-86 ATC250R ?

  1. 09-05-2009, 03:19 PM #1
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    Will 86-87 TRX 250R motor also fit 85-86 ATC250R ?

    just wondering ? guy needs 2 motors and there are some available but they are from TRX's. Will they fit right in our 250R's ?
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  2. 09-05-2009, 03:29 PM #2
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    not positive but im pretty sure they are identical
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  3. 09-05-2009, 03:39 PM #3
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    85-89 all interchange. trx and atc
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  4. 09-05-2009, 03:56 PM #4
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    ^X2 - All the same beside colors, differences in cylinders and the longer rod in the 87 and up TRX motor........
    All our government does is distract us while they steal from us, misspend our tax $ and ruin our country
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  5. 09-05-2009, 04:16 PM #5
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    which one runs harder? long rod or short rod? stock for stock all other things equal
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  6. 09-05-2009, 04:24 PM #6
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    short stroke revs faster
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  7. 09-05-2009, 04:31 PM #7
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    but long rod has more torque?
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  8. 09-05-2009, 04:56 PM #8
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    thats the general belief. the more square the boreXstroke the quicker reving the engine is. and a long rod engine has more torque
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  9. 09-05-2009, 08:57 PM #9
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    thanks for all the sweet info guys!
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  10. 09-06-2009, 10:14 AM #10
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    85-86 does not have a bridged intake, therefore can create more power by less resistance.
    As opposed to a 87-89 motor
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  11. 09-06-2009, 10:48 AM #11
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    Quote Originally Posted by lndy650 View Post
    thats the general belief. the more square the boreXstroke the quicker reving the engine is. and a long rod engine has more torque
    THE BORE AND STROKE IS EXACTLY THE SAME ON ALL OF THE MOTORS!!!!
    SO YOU CAN THROW THAT THEORY OUT.....
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  12. 09-06-2009, 10:50 AM #12
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    the bridged exhaust port allows the port to be much wider witout being a ring snagger therefor making much more power than the older style

    the stroke is most certianly longer KASEY
    Last edited by lndy650; 09-06-2009 at 11:33 AM.
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  13. 09-06-2009, 10:50 AM #13
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    Quote Originally Posted by MagicJames View Post
    85-86 does not have a bridged intake, therefore can create more power by less resistance.
    As opposed to a 87-89 motor
    THE RINGS ARE THE ONLY PART THAT REALLY CAUSE RESISTANCE, THE PORT TIMING WOULD BE THE ONLY PART THAT WOULD CREATE MORE POWER,
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  14. 09-06-2009, 10:56 AM #14
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    Quote Originally Posted by lndy650 View Post
    the bridged exhaust port allows the port to be much wider witout being a ring snagger therefor making much more power than the older style

    the stroke is most certianly longer on the newr engine KASEY
    DUDE ,,its not!!! all atc and trx motors have a 72 x 68 mm bore and stroke,,, and if you have had both cylinders side by side you would see that the top part of the intake port is the same ,, so the ring snagger theory is out the window too!!!
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  15. 09-06-2009, 11:00 AM #15
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    you have no clue what your talking about do you? a wider exhaust port will always result in more power. and what are you talking about the intake port for?that is irrelevant to this subject

    port timing changes what rpm you make power at. why dont you do yourself a favor and buy the 2 stroke tuners handbook and read a bit
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