Yamaha WR250R Mega Thread

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

  1. bhd1223

    bhd1223 Been here awhile

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    Thanks for the tip guys. I do this for the plastics on my road race EX to help keep them from cracking but didn’t even think about their uses in other applications. Do you recommend the small ones or the normal size? The small ones are the ones that are like 4 or 5 inches long and maybe 1/16 or 1/8” wide. I think the normal size are about 8” long and 1/4” wide.
  2. debaisley

    debaisley Long timer

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    i use the smallest ones i can get , i think they are about 1/16" wide , they hold real well.
  3. bhd1223

    bhd1223 Been here awhile

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    Just one per hole? Does that stand up well to highway speeds?
  4. debaisley

    debaisley Long timer

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    yep, pull em down nice and tight, will give the shroud a little flex when you fall on it , but it wont feel loose at all.
  5. bhd1223

    bhd1223 Been here awhile

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    Well I removed the bolts and installed the small zip ties. There is some play which worries me about the ties wearing down over time but they'll get a nice long high speed test shortly. I'm sure they'll do fine.
  6. Krabill

    Krabill Long timer

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    Just be sure to carry extras with you.
  7. SkizzMan

    SkizzMan There, that's it

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    Try fitting two thin ones in each hole. That way when they start cracking and shedding off you have redundancy and an easy visual check. Should still break off to save it in a hard fall.
  8. Crawdaddy

    Crawdaddy Navigate 2 Adventure

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    Shameless plug....

    We're only about a month away from the next ride at Primm/Bar 10 Ranch/Toroweap, etc......I'm about half booked right now and I need to get the numbers finalized for motels/Bar 10/T-Shirts/etc.....join us if you can......the trails/views are incredibly scenic....

    http://crawdadoffroadevents.com/core-calendar/view/15

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  9. R_Lefebvre

    R_Lefebvre Been here awhile

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    Not entirely correct.

    First of all, the 14.7 number is just pure coincidence. It's actually based on a mass ratio, atmospheric pressure has nothing to do with it, and 14.7:1 is still the number if you're on top of Everest where the air pressure is lower than 14.7psi.

    Secondly, even in a perfect world, 14.7:1 will not burn every bit of fuel, or every bit of air, completely. Due to randomness of nature, there will always be some molecules that do not combine properly. This is why even the cleanest engine will still emit CO, NOx and O2 before it gets to the catalytic converter.

    The amount of unburnt O2 in the exhaust stream is measured, and this is how we determine the AFR. When you run richer than 14.7:1, NOx and O2 falls off, and CO and unburnt hydrocarbons skyrocket. When you run leaner than 14.7:1, O2 goes up, NOx skyrockets, and CO and HC falls. 14.7:1 is the point at which NOx, CO and HC are the lowest in combination, and also provides the correct balance of chemicals to the catalytic converter to clean up all three.

    Modern fuel injection systems only shoot for 14.7:1 at light and moderate loads. At full load, they ALL go richer than that. In this regard, racers and street engines are the same. At light loads where you can run full timing advance, 14.7:1 actually makes more power than running rich. But above a certain load, you have to start either pulling timing, or richening the mixture to ward off detonation. 13.0:1 is a pretty safe target for a naturally aspirated engine. 13.5:1 will yield even more power, but at the risk of detonation. This is where racers differ, as they will push the limits to get more power and sacrifice engine life.
  10. HardWorkingDog

    HardWorkingDog Harvey Mushman

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    Alright, let's get into metaphysics! I love it :clap :clap :clap

    So, in a perfect world is coincidence possible?

    Is there such a thing as randomness, in a perfect world?

    :dunno

    Anyway, thanks for carrying on the afr search. I'd love to get a Power Commander and an afr meter. In the meantime, I just want to ride even more...
  11. jtmajors

    jtmajors OCD with motorcycles

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    I have an x and putting pirelli mt 21's on it. Sizes are 120/90x17 for the front and 130/90x17 for the rear. Having a hard time finding a tube in those exact sizes and wondering if a msr heavy duty tube that is 70x100x17 will work?
  12. bhd1223

    bhd1223 Been here awhile

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    I believe in the perfect word everything is a random pattern. :rofl So anyways, the zip ties held fine. I doubled up upon return anyways though.
  13. cug

    cug --

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    In a perfect world, randomness would be truly random and not based on physical or algorithmic pseudo randomness, or other reasons.
  14. Reposado1800

    Reposado1800 Juicy J fan!

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    It should work. I got the WRX tube sizes at SWMoto tire. Have you checked there yet?
  15. cozmo2312

    cozmo2312 Canyon Carver

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    why does my edge taillight keep blowing fuses? the first time i put it on, i just plugged it all in, bike started, everything lit up, but when i hit the front brake, it popped the fuse. did some reading, i guess i needed to unhook the battery first. ok, unplugged the taillight, unhooked the battery, new fuse in, plug taillight in, hook battery back up, turn on bike, good to go. hit brake lights, fuse pops.

    grrrr... what am i doing wrong?
  16. bigdon

    bigdon Long timer

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    Sounds like you have a direct short in your brake light circuit. Check your wires and be sure you have not pinched one.
    If the Edge uses a regular tail light bulb,pull the bulb then activate the circuit to see if the fuse blows. I have seen bulbs installed incorrectly in the socket .
    If it's not the bulb or shorted wire , make sure all the wires are connected in the right place.
  17. cozmo2312

    cozmo2312 Canyon Carver

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    yeah, dumb me figured it out. where i spliced the wires from the taillight to the bikes wiring harness i left the three wires exposed and wrapped them in electrical tape as a group. so when i hit the brake light, the wires were touching and shorted. wrapped them individually in electrical tape, then as a group. all is well.
  18. Shawnee Bill

    Shawnee Bill Long timer

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    Get some heat shrink and put over those splices, tape leaks, comes loose and just isn't real good for jobs like that. Or use some of that liquid electric tape they have these days, it seems to work pretty good.

    .
  19. cozmo2312

    cozmo2312 Canyon Carver

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    will do, project for another day. i'm tired of fiddling with it, haha
  20. R_Lefebvre

    R_Lefebvre Been here awhile

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    For sure coincidence is possible in a perfect world. Coincidence simply means two similar things happened at similar times.

    Anyway, I'm not making this shit up. It's basic thermodynamics. if you take the perfect amount of O2, and the perfect amount of fuel, mix them in a lab, and combust them, you'll still have unburnt O2, and unburnt fuel left over, due to the randomness of nature (entropy). That is what the Oxygen sensor measures, and that is why there is unburnt O2 in the exhaust stream even at 14.7:1.

    Sorry to get metaphysical on you, but this was my job in the past and I still have a passion for it. :)