Yamaha WR250R Mega Thread

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

  1. MeefZah

    MeefZah Curmudgeonly

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    If it's any consolation, there are no hills in the UP either.
  2. amtz.zero

    amtz.zero Adventurer

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    Moreno Valley, CA
    I asked this earlier but I guess no one saw my post:D, but can I run the stock chain if I move up to 13/46 gearing? Thanks!
  3. thumpididump

    thumpididump MacGyver

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  4. mpatch

    mpatch Long timer

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    No pretty sure 45 is the max depending on tire with stock chain.
  5. skierd

    skierd Wannabe Far-Rider

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    No, you'll need a 110L chain for a 13/46 combo. 45 barely fits, but is much happier with a 110L (its what I'm running currently).
  6. thumpididump

    thumpididump MacGyver

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    For some reason, I was thinking stock chain was 110 links, but now I remember it's in fact 108. I can't imagine 108 will work with 13/46. Sorry.
  7. KansasBob

    KansasBob Been here awhile

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    44 is as big as you can go. I've been running one since July, and you notice the "slight" difference you might think. I'm getting ready to put on a new chain and go to 13-47, so If you want a 44 with 800 miles on it, I'll sell it for $25 shipped. It uses your stock bolts. Steel sprocket.
  8. amtz.zero

    amtz.zero Adventurer

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    Thanks, but I'm probably just going to do the same as you and get a new chain and sprocket. Thanks for all the replies.
  9. oldtrucks

    oldtrucks Been here awhile

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    While looking for an Ignition Hot to tap into I shorted and lost power to my ignition, headlight, tail light, brake lights, horn, and dash console. The blinkers still work and the fuel pump powers up fine. I checked all the fuses and they're all good which makes me think I did something to the Relay Assembly.

    Anyone know of a way to check the Relay before I spend the $
  10. Sewerat

    Sewerat Cert. bike whore

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    If memory serves me correct. There is two locations for fuses? One on the left should side or something? But I could be wrong. Been that before.
  11. oldtrucks

    oldtrucks Been here awhile

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    I've checked both spots, the 30 amp main is good and all of the individual fuses in the Block are fine as well
  12. DragonNester

    DragonNester Been here awhile

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    Oct 16, 2009
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    Greenback, TN
    Go ahead and put a 47t steel sprocket on her with a 112 link X-ring chain. It's a good dirt ratio without sacrificing the highway too much...IMO

    Remember your speedometer will be way off after any final drive ratio change.
  13. 1Down-5Up

    1Down-5Up Been here awhile

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    What's the most "mileage" anyone gotten out of a fuel pump?
  14. Joe Watson

    Joe Watson Long timer

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    Well, it's time for me to sign out all! I hope you all got a little bit of info from my build. It will be in my signature for a while, so check it out. The WR250R went to a new home today, hopefully it gets may more good miles on her as it gave me.

    Farewell.

    [​IMG]
  15. japako

    japako Been here awhile

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    I'm pretty sure the relay for the lights is the same as the other small relay.
    Try swapping the two relays.??

    You can also check the continuity of the relay.
  16. pfy50

    pfy50 Professional nOOb

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    Oldtrucks,

    Did you disconnect the battery before attempting to tap the line? If not you may have fried a diode in the Starting circuit cut-off relay. You will need a volt meter with diode test capability. It is pretty hard to fry a relay without blowing a fuse so here is the tech manual on sequence to check continuity of your relays and the final check is the diodes. The photos are numbered in sequence as found in the rear of the tech manual. Have fun:huh.
    Paul
  17. oldtrucks

    oldtrucks Been here awhile

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    None of the relays I found are alike, all different shapes, sizes, and connectors. The one in question has a 16 pin connector, all the others are much smaller
  18. pfy50

    pfy50 Professional nOOb

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    Oddometer:
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    That's should be the relay. The Start circuit cut off relay and fuel pump Page 2 and 3 above
    It is #11 on the wiring diagram, you should be able to see the diodes on the schematic.


    If it is the Start circuit cut-off relay(#11)I believe this is the part #<table id="parts_table" class="table table-striped"><tbody><tr id="p_689806"><td class="nam_cel">Relay Assy</td> <td class="num_cel">5VK-81950-40-00 [​IMG]</td> <td class="pri_cel">
    </td></tr></tbody></table>$36.34 @ Cheapcycleparts.com http://www.cheapcycleparts.com/mode...wr250r-wr25ral/assemblies/258922-electrical-2
  19. oldtrucks

    oldtrucks Been here awhile

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    Paul,

    Battery was in and the Key was on. I was using a test light trying to verify I had the taillight connector. Last thing I did was tell myself to not let the probe hit two posts at the same time, the rest is history :dog
    I'm in denial and was hoping it would be something simple. Thanks for the prod, looks like I'll be learning about the WR electrical system later today

    Larry
  20. oldtrucks

    oldtrucks Been here awhile

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    That's the part I have in my hand, less the "-00" on the end. I'll feel a lot better ordering it once I test it and know it has a problem. Thanks