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Thread: 250r engine question 85 vs 86

  1. 11-06-2005, 02:58 PM #1
    denn
    denn is offline At The Back Of The Pack Arm chair racerFirst time rider
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    250r engine question 85 vs 86

    Is there a difference between the 85 and 86 250r motors? Did they change anything? Any info will help.

    Thanks denn
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  2. 11-06-2005, 03:03 PM #2
    250r'en +TCB's Avatar
    250r'en +TCB
    250r'en +TCB is offline Power User Roostin Away
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    I know the carbs were changed.
    Go to servicehonda.com, go to genuine parts finder and look at the differences between the two.
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  3. 11-06-2005, 05:25 PM #3
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    Jason Hall
    Jason Hall is offline Power User Roostin Away
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    I believe the only difference is the weight of the flywheel & the color of the paint, 85 was black & 86 was grey.
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  4. 11-06-2005, 06:20 PM #4
    deathman53
    deathman53 is offline Power User Teaching quads a lesson
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    every year had a different weight flywheel and difference cylinder head, don't know the reason for the change, the 88/89 flywheel is advanced 2 degrees. from is visual look the 85-87 heads have a smaller dome, 88 is alittle less and 89 is the least.
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  5. 11-10-2005, 08:57 PM #5
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    BigRedRunner
    BigRedRunner is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    What are you looking to know exactly? Do you have a pile of parts you want to put together, or just swapping engines?
    "Trikes don't kill people. I kill people."


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  6. 11-11-2005, 02:36 AM #6
    denn
    denn is offline At The Back Of The Pack Arm chair racerFirst time rider
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    I'm building an 86 250R from nothing. I am going to need an engine. I was just wondering if an 86 engine was improved over an 85. I would like to try and keep the bike all 86 but if I can come across an 85 engine I could just change whatever the differences are between the 2 years. I really don't know much about the honda's. I have been strictly a TRI-Z guy for 15 years. I got one when I was 13 and never rode anything else.


    Thanks Denn
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  7. 11-11-2005, 06:32 PM #7
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    BigRedRunner
    BigRedRunner is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Yeah, I've been there. 85-86 are essentially the same thing. Its when you hit '87 that you get into different gearing, long rod engines, clutch setups, blah blah blah. However, they'll all fit in your chassis.
    "Trikes don't kill people. I kill people."


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  8. 11-11-2005, 09:18 PM #8
    Blown 331's Avatar
    Blown 331
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    Trikes don't kill people. I kill people. Now that is awesome!
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  9. 11-11-2005, 09:50 PM #9
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    firefirefire90
    firefirefire90 is offline I have more Lip than Brains Roostin Away
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    i thought the ATC 250R was already a long rod?
    Rest in peace Rex Carlson
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  10. 11-12-2005, 12:10 PM #10
    X2guy
    X2guy is offline First Time Rider Arm chair racerNew to the board
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    I think it was in 87 that they went to the long rod crank. I'm currently building an 86 with a long rod crank. I will need a piston for a 87+ to compensate for the increased rod length. The long rod is 5mm longer so the piston pin is set 5mm higher in the piston.
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  11. 11-12-2005, 12:15 PM #11
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    Blown 331
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    Quote Originally Posted by X2guy
    I think it was in 87 that they went to the long rod crank. I'm currently building an 86 with a long rod crank. I will need a piston for a 87+ to compensate for the increased rod length. The long rod is 5mm longer so the piston pin is set 5mm higher in the piston.
    You can acutally run a long rod with the 86 piston, you just have to get a 5mm spacer plate under the jug. I think spark plug to frame clearance is pretty tight if you do this on a 3-wheeler.
    08 Outlaw 525s
    07 CRF70
    04 Harley FLHRCI
    04 TRX90
    03 XR650R
    03 400EX- XR650R engine
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    00 XR50R
    00 XR70R
    99 PW50
    99 JR50
    96,95 Sportsman 400
    95 Xplorer 400
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    87 Trail Boss
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    83 ALT50
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    76,75,74 XL70
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    72 Harley FX
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  12. 11-12-2005, 05:44 PM #12
    deathman53
    deathman53 is offline Power User Teaching quads a lesson
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    Its not too bad, I use spacer plate motors, don't even try it if you are gonna use a cool head though, or any aftermarket head. the spark plug is so hard to get to,
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  13. 11-13-2005, 01:52 AM #13
    sandrooster
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    Quote Originally Posted by Blown 331
    Trikes don't kill people. I kill people.
    Blown, you're a cop?
    85 ATC250R
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  14. 03-29-2006, 11:47 PM #14
    movistargixxer
    movistargixxer is offline New to the board Arm chair racerNew to the board
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    someone told me that the early 85's were 5spd
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  15. 03-29-2006, 11:59 PM #15
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    Red Rider
    Red Rider is offline Wires, Hoses, & Digital Wizardry. Got the holeshot
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    Quote Originally Posted by movistargixxer
    someone told me that the early 85's were 5spd
    Someone didn't know what they were talking about.
    Red Rider's Sand Machine Updated 07/23/14
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