Yamaha WR250R Mega Thread

Discussion in 'Thumpers' started by Sock Monkey, Apr 7, 2008.

  1. freetors

    freetors Long timer

    Joined:
    Feb 20, 2011
    Oddometer:
    1,042
    Location:
    Collinsville, OK
    Are there any companies that sell springs for our suspension? Specifically for the forks. I only weigh about 145 with gear and I'm only getting about 1.5-2 inches of sag on the front. The forks seem pretty harsh on almost all bumps and they are not very supple or plush. The rear spring is a little too stiff but I was able to get the proper amount of sag on the rear, albeit it s near the limit of preload adjustment.

    I'm more of a DIYer so dont tell me to just send my stuff off to some suspension tuner. I dont feel like a complete shock rebuild or anything like that are necessary for me now.
  2. HardWorkingDog

    HardWorkingDog Harvey Mushman

    Joined:
    Aug 20, 2009
    Oddometer:
    1,970
    Location:
    Walnut Crick, Cal.
    I don't know if that's just a weird coincidence, or maybe if I took the time to figure out all the unit conversions it would turn out that we're really saying the same thing. Or not.

    Anyway, the stoichiometric ratio of 14.7 parts air to 1 part fuel is what would be needed to just exactly burn every bit of fuel, completely. In a perfect world.

    Modern fuel management systems try to get the air-fuel ratio as close to that as possible to minimize exhaust pollution, while still providing enough power to satisfy the need for speed. And sacrifice performance in the process. Racers, as an example, don't aim for 14.7 to 1.
  3. bhd1223

    bhd1223 Been here awhile

    Joined:
    Jun 2, 2009
    Oddometer:
    294
    Location:
    CT
    How did you get the proper sag in the rear? I'm about 180+ with gear and can't get close to static sag but have good free sag at the maximum spring length/minimum preload adjustment. Preload is the 8.5" max spring length as specified in the service manual. I'm about 1" (25mm) or a little less in free sag and 2.25-2.5" static sag. I'd like to be more around 3.25-3.5" static sag. We do have 10.6" of travel so 1/3 is around 3.5"
  4. freetors

    freetors Long timer

    Joined:
    Feb 20, 2011
    Oddometer:
    1,042
    Location:
    Collinsville, OK
    I only take two measurements when I set my sag: with the suspension completely unloaded and with my weight on it. I measured from the top of the swingarm directly above the axle up to the top of the helmet lock simply because its easy to measure from those points while sitting on the bike.

    I've never measured "free sag". Would somebody like to explain the significance to me?

    I have between .25 and .5 in of threads left at the top of the shock but am getting 3.5" sag at the wheel. With the shock in the stock preload setting I had about 2.5" of sag. At first I thought I would have to take the preload to the minimum but that gave me roughly 4" of static sag and felt really wonky just sitting on it.
  5. Machtig

    Machtig Been here awhile

    Joined:
    Aug 19, 2008
    Oddometer:
    369
    Location:
    Monterey, CA
    Hi all. I'm in Vegas and just checked in for the Vegas to Reno race. I'll be on the trusty WRR, #O31, Ironman Expert. The expert part, thats funny :lol3 My goal is to not get run over by trophy trucks and to finish in 15hrs or less. Its 550 somthing miles long fyi. Bike is stripped to the bare necessities. I'm running Michelin Deserts with a HD Michelin tube in the rear and a Michelin BIB Mousse up front. I've got two spare air filters, a spare chain slider, and a spare fuel pump.

    You can track my progress HERE enter password: wr250r and if it asks you to open page securely, click NO I should leave the start line around 0630 pacific time, maybe later as my lucky self drew next to last starting position in my class. :puke1

    I'll post more pics later, I've never been to a race this big. This is going to be a riot.
    [​IMG]
  6. bhd1223

    bhd1223 Been here awhile

    Joined:
    Jun 2, 2009
    Oddometer:
    294
    Location:
    CT
    If you are getting the proper static sag then I think you are beyond the allowable maximum spring length/minimum preload as stated in the service manual. I did this myself when setting my sag but then checked the spring length and it was longer than the maximum so I shortened up to the max length/min preload and am where I sit now.
  7. bhd1223

    bhd1223 Been here awhile

    Joined:
    Jun 2, 2009
    Oddometer:
    294
    Location:
    CT
    Good luck bud. Sadly I didn't get my R² until a couple years after leaving Vegas. The only thing I rode around there was my mini KLX110. The desert is a riot. Have fun and stay safe.
  8. cinco

    cinco bageldog

    Joined:
    Mar 31, 2010
    Oddometer:
    162
    Location:
    dogtown
    You need to do a Ride Report on this one! Good luck! :lurk
  9. freetors

    freetors Long timer

    Joined:
    Feb 20, 2011
    Oddometer:
    1,042
    Location:
    Collinsville, OK
    Well I checked my "free sag" with my current 3.5" static sag and I get a whopping 1.75"- I think I'll go and check my spring length. Its looking like I need softer springs with more preload. But my front suspension bothers me more.

    EDIT: I'm right at the soft preload limit of 8.5" of spring length.
  10. emerson.biguns

    emerson.biguns All idiot, no savant

    Joined:
    Apr 17, 2007
    Oddometer:
    10,920
    Location:
    The Old Pueblo
    :clap

    I'll be watching. Good luck.



    .
  11. GotMojo?

    GotMojo? Long timer

    Joined:
    Oct 22, 2004
    Oddometer:
    4,117
    Location:
    Ohio
    Agreed!
  12. Reposado1800

    Reposado1800 Juicy J fan!

    Joined:
    Dec 8, 2006
    Oddometer:
    5,814
    Location:
    5th and Main
    I followed the instructions you posted and they worked like a charm. My bike was at -1 from the factory and I bumped it up to +2. No more lean surging.
  13. GSBS

    GSBS FunHog

    Joined:
    Nov 22, 2005
    Oddometer:
    3,976
    Location:
    Blount Springs, AL
    Glad it worked for you. Were I you, I'd still pull the plug and have a look for peace of mind. Mine was perfect. YRMV.

    Mind you, I'm not saying this is the "only" or "right" way. But it's worked for me for almost 8K miles without issue.
  14. onetravdown

    onetravdown I can't ride where?

    Joined:
    Jul 27, 2007
    Oddometer:
    924
    Location:
    .
    Thanks to Simmons1 for trading his Safari for my IMS. For the type of riding I do the IMS was just to much tank. I think the Safari will be perfect for me. He lives down in TX so the IMS will give him the much needed fuel capacity for his area. It was the perfect trade! :thumb

    I went from this 2 weeks ago
    [​IMG]

    To this last weekend
    [​IMG]

    And finally to this tonight. I think I'm done changing its 'clothes' for a while. It's tiring enough changing it's shoes twice a week.
    [​IMG]
  15. onetravdown

    onetravdown I can't ride where?

    Joined:
    Jul 27, 2007
    Oddometer:
    924
    Location:
    .
    Good luck and ride safe!! I'll look forward to the ride report!
  16. Krabill

    Krabill Long timer

    Joined:
    Oct 25, 2005
    Oddometer:
    4,942
    Location:
    Tulsa, OK
    Good luck!!



    :lurk
  17. Shawnee Bill

    Shawnee Bill Long timer

    Joined:
    Feb 25, 2006
    Oddometer:
    2,324
    Location:
    Oklahoma
    Hey Joe, (That would make a great title for a country song :lol3), I thinned my herd, replaced my CRF250X with a WR250R.
    Well, I guess I didn't really thin anything but it's a great bike, slightly heavier and not as snappy as the CRFx, but for the kind of riding we(?) do I think it's a better choice. I hope, the deal's done.

    I'm planning on taking it to Silverton, Colorado in a couple of weeks, I'll find out if I did the right thing then.

    Good luck finding a WRR around here.


    .
  18. bhd1223

    bhd1223 Been here awhile

    Joined:
    Jun 2, 2009
    Oddometer:
    294
    Location:
    CT
    Well I got my new bars and stuff this evening. I haven't installed anything yet but did cut down each end by 9/16" to get back to ~30.5" length on the bars. I didn't measure that yet though. I'll do that tomorrow afternoon when I get the install on. Based off my rough measurements and some calculations the new pullback should be ~2.23" on the YZ bend Tusk Chub. Hopefully by tomorrow night R² will be back up and ready to ride.

    I'd like to take it on the longest trip of it's life Sat. About 105 miles round trip with 90 of 2 lane routes and 15 of interstate. The previous longest was my commute of about 95 miles round trip, 70 4+ lane highway and 25 2 lane routes. That's sad, right? Once I'm healed a little more I'll be looking to improve my off-road ability some and then get going on some short to mid distance "adventure" rides encompassing pavement and dirt. I want to wear out the trailwings on the pavement commuting though. I need to get this bike over 500 miles already. I should be close but really need to bust 1000 soon too. At least I've used it more than the previous owner.
  19. AZ TOM

    AZ TOM Long timer

    Joined:
    Oct 21, 2008
    Oddometer:
    4,493
    Location:
    Prescott AZ
    Did a little 420 mile ride last Sun with my WR. RR in Southwest Sec. under Grand Canyon Again & Again.

    [​IMG]
  20. HighFive

    HighFive Never Tap-Out

    Joined:
    Nov 8, 2006
    Oddometer:
    2,874
    Location:
    Okiehoma
    Go get em.....Machtig! :lurk:lurk

    HF :thumb