Brtp4's XR250R Build

Discussion in 'Thumpers' started by Brtp4, Mar 7, 2011.

  1. Brtp4

    Brtp4 Powdercoat it.

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    Don't worry about Hanksmybuddy....he's a riding buddy. All good.

    BP
    #41
  2. hanksmybuddy

    hanksmybuddy Been here awhile

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    Beotch.......I've got something you can look at! Is that damn Honda ready to roll yet. Taking the KDX out Monday late.
    #42
  3. Petrolburner

    Petrolburner Noise Maker

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    Can't get this out of my head, what is it that you prefer about the XR as opposed to the CRF? My brother has the 250x, I thought it was pretty good for a for stroke trail bike. Rode it back to back against my 125, and :tb I love 2 smokers...
    #43
  4. Brtp4

    Brtp4 Powdercoat it.

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    Quick update.

    I installed the 280 kit in it, along with some porting and another minor jetting change. Starts much better, 4-5 kicks when cold, 1-3 when warm. There is still a small bog when transitioning from the idle circuit up onto the main. I need to dial this out with the AP bleed.

    New top end is broken in. The bike now has a smooth, steady power. It is like a small electric motor.

    The bike is quite competent on tight singletrack, especially direction changes. The suspension still leaves some to be desired, but I have a CRF fork swap in the works. At that point I will hopefully be where I want.

    BP
    #44
  5. hanksmybuddy

    hanksmybuddy Been here awhile

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    The question is......can it run with the KDX200? I think not my friend!
    #45
  6. cyclewizard

    cyclewizard Long timer

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    Shut the fuck up and start your own thread jackass.
    #46
  7. hanksmybuddy

    hanksmybuddy Been here awhile

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    Brian.....some of your subscribers are getting a little riled up here. I think I've offended this dweeb! Let him know that you were on the KDX just last week. I don't want him to explode. He appears to be a very unhappy person. :rofl:clap:clap
    #47
  8. Brtp4

    Brtp4 Powdercoat it.

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    CW, you're misreading things.....HMB is a very, very good friend.

    BP
    #48
  9. hanksmybuddy

    hanksmybuddy Been here awhile

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    Oh yea..... I'm feeling the love here now.:freaky Let's go have a beer and continue this love fest.
    #49
  10. cyclewizard

    cyclewizard Long timer

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    Shit fella's I'm sorry for being an asshole my meds aren't working to good..

    Boy do I feel bad now.....sorry hanksmybuddy, I fucked up..
    #50
  11. nlm101

    nlm101 n00b

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    I'm very interested in this thread as I'm in the process of sprucing up my XR. What is the seat I see in the pics?
    #51
  12. Brtp4

    Brtp4 Powdercoat it.

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    Seat is from SDG in Socal, Really firm, but well made.

    BP
    #52
  13. nlm101

    nlm101 n00b

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    Thanks for the info. I'll look into that. Looking forward to more details on your rebuild
    #53
  14. Gunslinger1

    Gunslinger1 GIVE'R

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    Big Bomber,

    This thread is really going to cost me............already has..........found an 00 XR400 close to the house with little time on it...........HAD to HAVE it after reading your logic about these bikes.

    Love the new gloves thank for the suggestions.
    #54
  15. Brtp4

    Brtp4 Powdercoat it.

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    XR280R v2.0

    After riding the modded little XR quite a bit, I swapped back to the stock carb. I was struggling with breaking cables and could not dial in the jetting. Fuel mileage also sucked. With the stock carb it had much less power, but worked well and I really liked it. However, I was started to get tired of the old-tech suspension. I finally bent up my front wheel pretty good while in some rocks:


    <iframe src="http://www.youtube.com/embed/n1xNcaXhdrY" allowfullscreen="" height="315" width="420" frameborder="0"></iframe>
    Since I now needed a new front wheel, I decided to take the opportunity to upgrade the suspension. I had a set of 2006 CRF250X forks, and gathered the parts for a swap. Stock, early CRF triples have a 24mm offset. Stock XRs are 18mm. I got a set of 20mm clamps from Scotts performance, which are made by Billet Racing Products:

    [​IMG]

    CRF forks need to be shortened to get as close to proper geometry as possible. One of the best CRF suspension shops is Precision Concepts in Riverside, CA. Precision Concepts is owned by Bob Bell, who has a long history with Honda's factory Baja team, and has assisted with suspension development for Honda. Additionally, at some point in the past he actually sponsored a team of XR250R's for the Baja 1000. PC shortened and revalved the forks, with a net increase in static height of 1".

    [​IMG]

    To balance the suspension and the height, PC revalved the rear shock, and took out a shim that added 4mm of length to the shock. The shock leverage ratio starts at 4.0:1 which means the ride height is now 16mm higher. 1" = 25mm, so I made up the difference with a taller rear tire.

    [​IMG]

    The fork swap is easy, it's chasing down the details that is the hard part. I had to get a new headlight, handlebar switch, lever / comp release combination, new fender, few other things:

    [​IMG]

    [​IMG]


    [​IMG]

    And the final result:

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    BP
    #55
  16. Tachedoutoffroad

    Tachedoutoffroad Mr. Parrish

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    250/300s rule :freaky:freaky

    [​IMG]
    #56
  17. Johnnyboxer

    Johnnyboxer Long timer

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    looks great
    #57
  18. Olas

    Olas the darkness

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    Why didn't you go with the XR400R fork swap? I did it to mine, great upgrade to the stock XR250R forks and really not much work involved in doing so.
    #58
  19. elsalvadorklr

    elsalvadorklr southern xr rider

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    as usual BRT

    awesome work man, :D:D
    #59
  20. Brtp4

    Brtp4 Powdercoat it.

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    Agreed. The 400 forks are probably just as good and half the work to install. However, the CRF Showas have more adjust-ability and rigidity, and I already had a set.

    BP
    #60