Yamaha WR250R Mega Thread

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

  1. GSBS

    GSBS FunHog

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    I used a 12T CS with with stock 43T rear for about 2K miles... chewed up and spit out the rubber swing arm guard. Now running 13/47 (approximately same final drive ratio) and the swing arm guard is fine.

    And I do keep the chain adjusted.
  2. Sewerat

    Sewerat Cert. bike whore

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    You might not like the 14/50 combo, it's so close to the stock gearing, not enough bike umph to push it. I just put my 13 on and the bike is faster all around. I'm running a tall tire too. Circumference on the new soon to be used tire is just over 2100mm
  3. UtahFox

    UtahFox Been here awhile

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    Sounds good - guess I'll just button it up then and do some riding.
  4. debaisley

    debaisley Long timer

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    I always use blue thread locker on the counter-shaft nut and never had one come loose , the peening the nut with a hammer doesn't work well and its a pain anyway.

    i do place a line of paint from the nut to the sprocket so i can see if it has moved.
  5. rhollamby

    rhollamby Been here awhile

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    Thanks wouldn't have thought about that, until I needed it.

    I was looking to use blue, so thanks for confirming.

    Anyone know off hand the pounds of torque required for the CS nut?

    Thanks.
  6. UtahFox

    UtahFox Been here awhile

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    You can find that here in the WRR Data, Specs, and How-To thread.
  7. Gryphon12

    Gryphon12 Long timer

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    14/50 is 3.57:1 while factory stock 13/43 is 3.31:1 which is quite a difference. You aren't seeing it due to your tall rear tire, which takes the ratio the other way. For example, 13/50 (3.85) gearing feels more like 13/46 (3.54) when you change from a stock rear tire to a tall MT-43. Hence, your preference for a 13 tooth CS and 13/50 with a tall rear.



    I've been keeping a survey of all gearing comments on this Mega Thread:
    • For mixed riding, the overall consensus is that 14/48 (3.43) to 14/50 (3.57) are the best overall (112 link chain).
    • You can get similar results from 13/45 to 13/46 (110 link chain) [13/47 best with 112 link chain?].
    • For heavier off-road, 13/47 (3.62) to 13/50 (3.85) fits the bill (112 link chain); so just change the CS down one tooth. If you really like 14 up front, 14/52 works (3.71) [not sure about chain length for 52 tooth rear sprocket].
  8. Sewerat

    Sewerat Cert. bike whore

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    Exactly. And with my 14/50 combo with a fresh Mitas stone eater, it lacks in power, maxes out at approx 122 kms/hr get Ono a good head wind, good luck maintaining 100kms. Uphill about the same. Now changed to 13 front and bike will easily pull 125 constant hit 134 last night with this combo on gravel. I am thinking I want 52 rear to match the 14 but not sure if a 52 will fit with the lower chain guide in place?

    I have been playing with my gearing for the last year finding what I like and don't like and was just recently introduced to gearing commander and that is making my life much easier. I already know what gears I have I like with certain tire so now I try to get as close to that with a 14 front to try and save my swing arm this summer. So far 14/50 doesn't work for me, still too high geared.

    I've got and tried just about every combo with the following gears 12,13,14. & 43,47,48,50. Just got the 50 so haven't tried 12/50 but that would just be stupid low gearing.
  9. UtahFox

    UtahFox Been here awhile

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    Please keep posting your thoughts as you go through your changes :ear
  10. GSBS

    GSBS FunHog

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    My 13/47 gearing with FMF, airbox opened, etc. and running the larger MT43 tire feels just about right for me as a true dual sport bike. It fades just a bit on long uphills on the road (but I can gear down to fifth and always maintain 70 mph if I want). Off road low gear is already very low and second has plenty of power to wheelie over mud puddles and small obstacles. Any lower gearing, for me, would be a real nuisance on the street as maintaining a decent speed would be pretty buzzy.

    My 2¢
  11. Rainshadow

    Rainshadow Been here awhile

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    Yeah! My new to me 08 has 13/47 and a new MT43 waiting for the deathwings to either wear out or for me to lose my patience with it. Seems OK for street and light gravel, but I'm starting to fondle the MT43/IRC combo waiting in the shadows...
  12. jon_l

    jon_l Long timer

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    Inquiring minds want to know...

    which IRC? TR-8? GP-1?
  13. BluePill

    BluePill AARP Slacker

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    FWIW, standing lightly on a horizontal breaker bar and then shifting all your weight to it quickly (just like kick starting) often works well. Do watch out for your shins, because the bar may slip.
  14. what broke now

    what broke now Petroleum Brother

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    Heating the assembly helps removal with loctite, too.
  15. andy mac

    andy mac Adventurer

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    I also had to get the bike shop with impact gun to loosen the factory installed cs nut. Since then I used a breaker bar and a padlock thru the rear sprocket and chain to stop the cs turning.

    49 or 50 rear sprockets with 13 for off road or 14 for dual purpose rides.

    Tried a MT43 trials tyre earlier this year, had great traction but it raised the bike seat too high and the gearing was equivalent to +1 on cs. 114 link chain to clear mudflap with 13/50 sprockets for a dual purpose ride.

    Have just sold my WRR and am questioning that decision :huh
  16. andy mac

    andy mac Adventurer

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    Slideshow of my last adventure ride - 4 days through the high country of Central Otago, New Zealand. The WRR and KTM 640E are a good match.

    http://youtu.be/3Y9CAUwfzX4
  17. dnsjo

    dnsjo Adventurer

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    Anyone have any experience with the MRA windshields? I saw where one poster on a different site recommended the RoadShield style, but I guess it depends on the type of riding one does. They have four styles that will fit the WR's. I ride mostly highway, forest road, and gravel with very little woods or singletrack. Thanks.

    Link:
    http://www.twistedthrottle.com/shop-by-bike/yamaha/wr250x-wr250r
  18. keiji

    keiji Long timer

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  19. jgormley

    jgormley Been here awhile

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    I have the VNB on my wrr and it went on easy...
    can be raised or lowered some to vary the amount of protection...
    some vibration at higher speeds but stays in place...
    not bad for two mounting points...
    and comes off easy if you don't want to use it...
    so I am happy with it....
  20. jwdub

    jwdub Been here awhile

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    I have the MRA on a DR650. It's very effective in taking the wind blast off of my chest at highway speeds with smooth air at my helmet and it doesn't interfere with off road riding. FWIW I'm 6'3" 32" inseam.