Yamaha WR250R Mega Thread

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

  1. rhollamby

    rhollamby Been here awhile

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    Where is your axle adjustment block sitting, towards the end or in the middle? Reason I ask is because I know the mt43 is a fat tire and shooting to have it set farther back to the rear of the adjustment for more clearance on the mud guard. Thanks
  2. Sewerat

    Sewerat Cert. bike whore

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    I running it tight to the front with 14/50 and now with 13/50 it's about 3-4 notches in. I'm running with a wide tire and no clearance issues
  3. soupknotzee

    soupknotzee Been here awhile

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    Height of the tire is the concern. 112 is what you need with the TALL MT43 so it can be farther back on the swing arm or it WILL rub the front mudflap. Width is not an issue here as this is a narrower tire.
    I run 13/47 112 and have been on many of the steep stuff I ride my KTM300 on in CO at 13,000'+ and it can run out of steam with this gearing/elevation. Other than steep rocky climbs or technical single track 13/47 is pretty good all around. But if I had to fine tune it I would give 13/48 a go or the equivalent with a 14 tooth front.
  4. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    Measured the MT43 on my friends trials bike yesterday (400x18).
    70cm or 27.5 inches tall.
    Anyone know the height of the stock tire?
  5. rhollamby

    rhollamby Been here awhile

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    What tire are you running with this gearing in this terrain? Taller tires like the D606's or mt43s or something more stock like the T63?

    I'm shooting for overall gearing of 13/47 and believe the 13/49 with the mt's will achieve this.

    Most of my riding will be 8,000-12,000 feet, and every couple weeks above 12k feet. Although to get to these trails running with more power at ~5-6k feet in elevation.
  6. Bogus Jim

    Bogus Jim Been here awhile

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    Mine measures 25.5". That is not the stock tire but it's a 120/80-18 50/50 knobby so should be in the ballpark. Not new; about 1/2 tread left.
  7. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    ...that's what I got too, so the MT43 is gonna be a good 1"-1 1/2" taller...hmmm...I want to here reports. :ear
  8. rideonjon

    rideonjon Adventurer

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    does anyone have some wheel spacers laying around that they could measure for me.i just need the lengths from them I believe the fronts and the backs all have different lengths.it would be much appreciated.
    cheers,
    jon
  9. ramz

    ramz Professional Trail Rider

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  10. rhollamby

    rhollamby Been here awhile

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    Thanks Rick, your part of th reason I'm going with these tires because I'll be riding in your back yard.

    Seems like the 112 will work, thats what I'm going to go with.
  11. Llamaha

    Llamaha Been here awhile

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    If I put Pirelli MT21's on my X will I need to change the gearing?
  12. jon_l

    jon_l Long timer

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    Buy an extra nut or 2, if you're going to do frequent swaps; the peening will take its toll.
  13. cjbiker

    cjbiker Nobody's Robot

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    Anyone know what the thread size is? Maybe the Eagle Mike KLR countershaft nut will fit?
  14. jon_l

    jon_l Long timer

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    [​IMG]

    pn 90179-18010-00

    $5.64 at Service Honda
  15. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    ...you mean on your 17's?
  16. GSBS

    GSBS FunHog

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    Yeah, I just bought one for my third CS sprocket change. I really do not like this method of securing the sprocket nut. First it requires that you beat on the spline with a hammer/drift, etc., which can't be good for it. Secondly, the tried-and-true dog-ear, bend over spline washer used on most bikes is cheap and never fails.

    Once I removed the CS cover to find this nut just finger tight. Yamaha must've recognized this as a weak design because I noticed the plastic CS cover has a keeper that prevents it spinning off. That's the only reason I haven't gone to one of the more open, aftermarket case savers.

    BTW, at the local dealer these nuts are about $8 with sales tax.

    I wonder if there's a normal nut with dog-earred washer that will fit the WR-R spline that can replace this system??? :ear
  17. UtahFox

    UtahFox Been here awhile

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    Red Loctite doesn't work on this nut?

    Oh, I bought a breaker bar and had a friend help, and I was still unable to remove it. I have a friend here who works @ the dealer - they're going to take it off for me for $15. I was planning on the Loctite upon reinstalling.
  18. Rapid Dog

    Rapid Dog bikes, booze, broads...

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    ...what gearing you planning on running Utah?
    I'd stear away from a 12T counter, but that's just me.
    I have one if anyone needs it amongst a couple other rears.
  19. UtahFox

    UtahFox Been here awhile

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    ATM it's 13x50 - 14 is what I want to get on there.
  20. GSBS

    GSBS FunHog

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    First time to remove mine required an impact driver (be sure tranny is in neutral). It had a green thread locker, not sure of brand. I use the blue stuff now.