Yamaha WR250R Mega Thread

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

  1. Rapid Dog

    Rapid Dog bikes, booze, broads...

    Joined:
    Oct 28, 2003
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    10,021
    Location:
    Strangel Living West of Hell, SoCal
    Sooo....any gurus out there?

    Installed an Athena 290 kit this weekend.
    Some snafus but caught everything.

    Took it out for a test ride, seemed to surge and basically run like shite.
    Stopped ad did some fiddlin' with the FMF fuel controller after it stalled then came back on.
    No biggie, that's happened before.

    Then took it up on the freeway. Bad choice.
    Went about a mile and it just died, dead...tow truck time.

    I've checked the fuel pump, pumping fuel.
    Checked for spark. Plug looked good, I have spark.
    Took the FMF controller out of the loop.
    Still it won't start or run....

    Cam timing looks spot on...

    I'm scratchin' my head here.

    [​IMG]
  2. RichardU

    RichardU Let's Ride

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    Aug 28, 2004
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    Marietta, GA
    Not a guru, but I have installed a big bore. Have you checked the connection to the throttle body?
  3. calfinm

    calfinm Adventurer

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    ENZED
    Just decided to read this thread from begining...about a quarter in..what a monster.. Learnt alot though, great so many people willing to share..Least I can offer is a couple of pics from last little bit of scratching up the coast.

    cruddy phone pics but this bike is a winner (yup we know this), I love it does everything from annoying the road bikes on the windys to bashing up the beach.

    [​IMG]
    [​IMG]
  4. DaymienRules

    DaymienRules Traffic target

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    vancouver, bc
    Posted mine in another thread. It was all of 10 bucks and about 40 minutes work. I wanted it spaced out a bit so I could easily clean behind it. No broken light thus far.

    [​IMG]
  5. jckid

    jckid Been here awhile

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    Looks like you got your answer, but just to confirm...mine is the larger size rack and it came annodized black. On ebay it sort of looks gray in the pics, but it is black. If you plan to carry a tailbag, I would recommend the larger size. It is kind of expensive, but it looks like a work of art! :D
  6. Gryphon12

    Gryphon12 Long timer

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    JC - thanks. I sort of got my answer. Neither website says anything about size, and your rack has a different pattern of slots (more) and holes (fewer) than those shown on the website.

    To be honest, it doesn't matter yet, as I haven't pulled the trigger on a WRX. I'm hoping that changes soon, however. And I like to plan ahead so that the mods don't take forever! :evil
  7. iWander

    iWander Adventure Geek

    Joined:
    May 29, 2007
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    63
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    SE Wisconsin
    Brought my WR250r home a week ago and I LOVE IT!. Thanks to everyone here for all the great info! I'm still reading but without this mega thread I don't know if I would have paid any attention to this bike because of its size. Now my Versys just sits in the garage and watches us go play. :cry

    So he's my question. I've read a lot about swapping out sprockets to get more power off road. I really like the gearing as-is for commuting, but I'm planning a trip to Colorado next August to ride some trails. If I don't change my gearing do you suppose I'll regret it? I'm 49 years old and I'm more into general trail riding than trying to scale an 89° cliff. I've swapped sprockets on other bikes so the actual task isn't an issue.
  8. iWander

    iWander Adventure Geek

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    ...and the obligatory pic.

    [​IMG]
  9. Buzzbomber

    Buzzbomber Not Dr. Who...

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    Go for it. I run 13/47 and I've done several 300+ mile road trip days. It's no fun trying to maintain 70+ mph for any length of time but it's fine at 55-60. Besides, running high speed for that long, I've been able to SEE the tire wear at the end of the day(I usually run T-63s) :eek1. The advantage to the shorter gearing for my use isn't really so much the better torque as the ability to go slower without worrying about the clutch in dicey terrain.
  10. Spank

    Spank Adventurer

    Joined:
    Aug 19, 2011
    Oddometer:
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    Location:
    North San Diego County
    There's 2 sizes of racks. JC's is the bigger version. The silver one pictured in the previous page by nice_rumble (page 2055) is the smaller version.

    The bigger one is rotopax and GIVI Monokey compatible. The smaller one rotopax compatible.

    Just mounted up my small rack and that thing is rock solid and really nice craftsmanship.
  11. HardWorkingDog

    HardWorkingDog Harvey Mushman

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    How often do you run in 6th gear? I realized even at freeway speeds I was running 5th most often...6th was just wasted for me with stock gearing. Lowering the gearing allowed me better low speed control, and now I use 6th routinely for high speed stuff. Just right for me, you'll have to see for yourself after riding a bit more.
  12. skierd

    skierd Wannabe Far-Rider

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    With R wheels and stock sized tires (120/80-18) - stock gearing is ok for most street and docile dirt road/two track use, but really could use a change on tight trails unless you love slipping the clutch. If its mostly street work with the odd trail day, get a 12T to swap on for play and run stock gearing most of the time. Or, go up from the stock 43 rear to a 45 or 46 for a lot more low speed grunt and controllability without sacrificing too much highway speed.

    With R wheels and plus sized tires (like the 120/90-18 D606 thats so popular), go with a 13/46 or /47 minimum. You'll need the extra gear to turn the taller tire, both because the taller size changing the effective gearing and because of its extra weight. If you want extra oomph on trails, some people like a 48 or even a 50 rear sprocket but its going to drop the comfortable cruising speed a bunch.

    With X wheels, I love the stock 13/42 gearing for all around street riding. Similar recommendations for gearing changes with regards to tire size changes, depending on the amount of trail/track riding you're doing. Right now I'm running a 150/70-17 (too big imo) with 13/45 gearing (perfect with the big tire).
  13. HardWorkingDog

    HardWorkingDog Harvey Mushman

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    :wave

    Hiya, Dave :D
  14. jon_l

    jon_l Long timer

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    I currently have 12/43 on (from original owner), and like it a lot. Due to the concern about the chain eating thru the seal guard and damaging the swing-arm, I plan to swap to 13/47 when my chain shows signs of wearing out. I also have a new seal guard on-hand, and the situation check regularly, no issues yet.

    I just ordered a 47 T Primary Drive steel sprocket (1022350055) from Rocky Mountain ATV (I needed something to make the free shipping minimum), and I have a like-new OEM 13T front sprocket already. Will buy a new chain when funds permit; right now my factory chain looks great (5,500 km).
  15. byron555

    byron555 Lame Duck Adventurer

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    My stock chain/sprockets did eat my seal guard and swing arm. So When I order from Rocky Mtn, I got a Primary Drive 112 link chain and 14/49 sprokets (DON'T FORGET THE TAPERED BOLT KIT, like I did). I used the stock bolts temporarily for a weekend trip up North with no ill effects, however, they were not very tight when I replaced them 350 miles later.
    I've got the stock 13t for single track trips and other low speed stuff, but the 14/49 works great as an all around gearing, and the new chain made for a much quitter ride. (48t rear would work good too)

    To reach the shipping minimum, order the motion pro mini fork bleeders? I have those and they are handy.
  16. bash3r

    bash3r I ain't no DingWeed

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    YES!!!! :freaky :clap:clap :rofl
  17. Mikef5000

    Mikef5000 Long timer

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    Columbus, OH

    Since you were ordering from Rocky Mtn, why didn't you just get the right sprocket to use your factory bolts? Not trying to be a dick, serious question. More sprocket choices or something?
  18. jon_l

    jon_l Long timer

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    Thanks for the input Byron. I monitor the situation regularly. I already have the 13/47 paid for so will probably go with it. My reading suggests it isn't sprocket size that causes it, but more likely a work-out, kinked chain. A smaller front sprocket would not cause it, but it could exacerbate the situation.

    Funny about the bolts - I asked a Rocky Mtn rep about them and was told I don't need them. That would be really irritating to need and not have. I'm glad you mentioned them.

    [​IMG]

    Is this what you used? http://www.rockymountainatvmc.com/p...rive-Sprocket-Bolt-and-Nut-Kit/sprocket+bolts
  19. Pantah

    Pantah PJ Fan from Boston

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    I like my stock gearing, but there have been a few times I wish I had lower gearing. My habit is to ride nothing tougher than two track, but they can have washouts and such that make for a lot of clutch slipping. Also, trying to extract the back wheel from a rut can be challenging because of the tall first gear. I generally get off the bike and walk along side her to get her out.

    I'll probably leave it stock for now, but I'm due for a new chainset so maybe not. :scratch That 14/49 option sounds good. It's a little taller than the 12/43 I had on it for awhile.

    I use stock size 120/80/18 Michelin T63 tire.

  20. TwilightZone

    TwilightZone Long timer

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    >"not a sprocket size that causes it, but more likely a work-out, kinked chain. A smaller front sprocket would not cause it, but it could exacerbate the situation."

    I ate my chain guard in Baja with a new chain/sprockets and a band new guard on before making the trip. Pretty sure it was from carrying luggage on the bike... and I'm f'n heavy too.

    I'm pretty sure an overly loaded bike did it... if you get the swing arm up in it's travel, you've got to watch the chain guard wear carefully. Since Baja, I went to 14x49 sprockets. I now have an extra 5,000 miles on the bike and I don't show any wear on the swingarm portion of the guard yet.

    RM offers up to 52 tooth rear sprockets... If you get the WRR sprockets (not the F model), they have 2 hole sets so you can use either the square or countersunk bolts.

    >"That 14/49 option sounds good. It's a little taller than the 12/43 I had on it for awhile."

    I'd go 50+ on the rear. 14/49 is a little tall geared.