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Thread: 250r intake boot

  1. #1
    Join Date
    Feb 2004
    Location
    Hampton, Virginia, C.S.A.
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    2,656

    250r intake boot

    need a new intake boot for my 250r. i was looking and noticed the 85 boot is not available but the 86 is. whats the difference in the two? the pictures look like its the same
    current rides
    82' ATC110
    85' ATC310R
    85' ATC250R
    85' ATC250ES
    16' brute force 750

  2. #2
    Join Date
    Apr 2012
    Location
    MI, USA
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    2,321
    Not sure what the difference is, but the 86 one will bolt on the 85 engine, they both use the same gasket part number. The 85 and 86 carb part numbers changed, so that could be a potential issue if the size changed. 250r's are not my strong point though.

  3. #3
    Join Date
    Feb 2004
    Location
    Hampton, Virginia, C.S.A.
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    2,656
    Quote Originally Posted by ps2fixer View Post
    Not sure what the difference is, but the 86 one will bolt on the 85 engine, they both use the same gasket part number. The 85 and 86 carb part numbers changed, so that could be a potential issue if the size changed. 250r's are not my strong point though.
    yeah it went from round slide to flat slide. but i believe they were both 34 mm carbs
    current rides
    82' ATC110
    85' ATC310R
    85' ATC250R
    85' ATC250ES
    16' brute force 750

  4. #4
    Join Date
    Oct 2003
    Location
    Las Vegas, NV.
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    2,047
    Which boot are you talking about here? The carburetor-to-reed valve isolator boot, or the airbox-to-carburetor boot? If it's the airbox-to-carburetor boot, it shouldn't matter which year, '85-86, that you use. If you're talking about the carburetor-to-reed valve isolator boot though, externally the 2 years are the same, but internally, I believe the '86 version was optimized (shaped differently) to flow better, with the '86 style reed valve stuffer. All of these parts will interchange between both years & carburetors, but the '86 style will flow better, when used with the '86 style reed valve stuffer.
    Red Rider's Sand Machine Updated 07/23/14

  5. #5
    Join Date
    Feb 2004
    Location
    Hampton, Virginia, C.S.A.
    --
    2,656
    Quote Originally Posted by Red Rider View Post
    Which boot are you talking about here? The carburetor-to-reed valve isolator boot, or the airbox-to-carburetor boot? If it's the airbox-to-carburetor boot, it shouldn't matter which year, '85-86, that you use. If you're talking about the carburetor-to-reed valve isolator boot though, externally the 2 years are the same, but internally, I believe the '86 version was optimized (shaped differently) to flow better, with the '86 style reed valve stuffer. All of these parts will interchange between both years & carburetors, but the '86 style will flow better, when used with the '86 style reed valve stuffer.
    carb to reed. thank you for the info. i just wanted to make sure the 86 boot would work with with the 85 reeds and carb
    current rides
    82' ATC110
    85' ATC310R
    85' ATC250R
    85' ATC250ES
    16' brute force 750

  6. #6
    Join Date
    Feb 2004
    Location
    Hampton, Virginia, C.S.A.
    --
    2,656
    it will be used on my 310 with v force 3 reed block and 38mm airstriker
    current rides
    82' ATC110
    85' ATC310R
    85' ATC250R
    85' ATC250ES
    16' brute force 750

  7. #7
    Join Date
    Jan 2012
    Location
    Carthage NY 250r rules
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    2,119
    I have used an 89 trx 250r intake boot on my 85 with both 85 and 86 carb plus a 38 mill works fine with all three carbs.
    250r rules

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