XRL owners sign in.

Discussion in 'Thumpers' started by onaXR, Jan 18, 2006.

  1. Sierra Thumper

    Sierra Thumper Been here awhile

    Joined:
    Oct 3, 2012
    Oddometer:
    641
    I'm going to cut open the top of my xrl airbox for better breathing with the powerbomb header. My jetting is on the rich side, especially the pilot jet/part throttle where I do alot of my riding. I have the stock carb with Dave's mods and the stock needle shimmed. Is the cut open airbox top going to require me re-shimming the needle?
    I'm at about 5000ft up in elevation, and ride up to 8000ft sometimes, and am running a 58 pilot (a little big for my elevation) and 155 main jet (keihins).

    The bike runs awesome, very sharp throttle response and pulls strong and clean everywhere, and starts with almost no choke needed (because of the rich pilot) and idles great.
    The plug reads a little rich tho, so I think the header and cut airbox should be perfect, but not sure if I'll have to re-shim the needle or not.
    I was thinking not, but if anybody has any experience with cutting open their airbox and rejetting for it, I'd love to hear your feedback :D
  2. ONandOFF

    ONandOFF more off than on

    Joined:
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    My friend used to say it this way: anyone faster than you is a maniac, anyone slower, an idiot.
    Speaking of riding your own ride... I broke my shift lever in proving I could get past Marty. The feeling of victory was very short-lived. But the costly lesson lives on! :deal
  3. nic579

    nic579 x

    Joined:
    Dec 17, 2012
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    Western NY
    I will never know the difference as the bike was decapitated when I got it. It is exciting to have it all dry fit, now for grease and wiring the birds-nest up without the instrument cluster.
  4. sc-razor

    sc-razor Long timer

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    I did, but that was a LONG time ago!:D
  5. sc-razor

    sc-razor Long timer

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    It was a Contour Roam. Somebody posted an Amazon link awhile back and it was only 70.00!
  6. ONandOFF

    ONandOFF more off than on

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    Neither of those mods should require any further shimming of the needle. My advice is to make the changes in steps then analyze how it runs after each. That gives a better feel for what changes really occur for each step, plus as much as these changes are interactive, sometimes they balance each other out in some ways.

    A 58 pilot is rich for low altitude, much less for 5-8k. I have the mods and running 55 now after changing from a 50. 50 was a bitch starting in cold weather, 55 made a big difference, and I actually dropped (unshimmed) my needle which fixed a slight top-end richness I was experiencing. Now, it's "smooth as budda" all across the board, zippier, and starts much better, although I do use the 'choke'. So if after you make the mods you propose, you still think it runs too rich at idle / slight throttle, then consider dropping your pilot, maybe try a 55. But if it "runs awesome, very sharp throttle response and pulls strong and clean" then why bother taking a chance of disrupting that? BTW, we want our XRLs running a tad rich anyway to keep our engines cool. And I'd rather sacrifice a touch of fuel in the mountains than deal with the hassle of an oil cooler (which doesn't mitigate combustion chamber temperature as effectively as a slightly rich fuel/air mixture, anyway).
  7. sc-razor

    sc-razor Long timer

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    There were a bunch of Jeeps coming off the top of Red Cone that day. There are plenty of videos on YouTube that you can see the trail on. Lots of loose base ball sized rocks.
  8. sc-razor

    sc-razor Long timer

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    That picture puckers me for sure!
  9. sc-razor

    sc-razor Long timer

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    There are 2 settings on the camera. The better quality setting uses too much battery so I had it on the lower quality setting.
  10. Jeff Munn

    Jeff Munn Just along for the ride..

    Joined:
    Nov 12, 2003
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    Location:
    Petersburg, Virginia
    Just picked up a 2008 XR650L to do the TAT this summer. I know this probably has been posted here somewhere, but with over 3000 posts in this thread I just have to ask instead of spending days sorting thru. Please forgive me.

    Have read about Dave's carb mods for 2003 and prior carbs. What about 2004 and newer? This PO of this bike de-smogged it, but left everything else stock. Stock pipe. Stock filter. Stock jets. It fires up and runs fine, but I have no basis for comparison and know uncorking the intake and exhaust always help.

    So my question is, do the Dave's mods also apply to later models? If not, what are the recommended mods to making it a little richer? The plug shows me it is on the edge of lean. I'd rather start with the filter, removing the snorkel, and doing the pilot/main, but don't know if it needs the disc spacer on the needle. If possible I'd like to leave the stock exhaust, but am fully capable of making it breath a little better without the noise.

    Please enlighten me, or point me to a web page that addresses these issues for the later model XR's. Thanks.

    jeff
  11. ONandOFF

    ONandOFF more off than on

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    I want to try it :(
  12. sc-razor

    sc-razor Long timer

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    Do ALL of Dave's mods and then tweak from there. Drill the slide, shim the needle, all of it. It's fine with the stock exhaust. I have a 2008 model and you'll like the change it makes. You can also google advrider: dave's mods and see several comments about it and some of the tweeks guys have done. Also personal preference, but instead of grinding the tab off the needle, I ground the tab off the carb so I could use the tab on the needle as a reference for setting it.

    http://www.4strokes.com/tech/honda/xr650lcarbmods/
  13. Sierra Thumper

    Sierra Thumper Been here awhile

    Joined:
    Oct 3, 2012
    Oddometer:
    641
    It was hard to get myself to buy the powerbomb and start modding the bike more, because it DOES run so good right now.......but at 5000ft up you lose a lot of power, especially with machines that don't have that much to begin with, so in the end I realized I needed to do what I always do to my machines up here......mod them enough so they run at least as well as a stocker would at sea level :lol3
    High elevation living sucks when it comes to power sports :baldy

    Thanks for the excellent advice :thumb I agree, I suspect that the bike is just going to run better with the airbox mods and header, I'm thinking I shouldn't have to go into the carb for anything......fingers crossed. I've never jetted an xrl before tho, just wanted some experienced info to help guide me :D
  14. Sierra Thumper

    Sierra Thumper Been here awhile

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    I'd love to try a recluse for my style of riding :evil :D
  15. JWhitmore44

    JWhitmore44 pistolero

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    Location:
    NW Kansas
    plug this into google maps 39.799272,-105.587929

    It was a neat road, with awesome views.

    [​IMG]
  16. ONandOFF

    ONandOFF more off than on

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    Hey Jeff!
    I'm very pleased to see you're going to take an XRL on the TAT! I think it'd be my choice if I could have anything. Any way I can help you just let me know. If you haven't seen it already, I suggest you check out the ride report on here by our neighbor and my friend XCrider (Denis). I like how he stitches together a ride report.

    All the carbs take the same mods. But the difference in "uncorking" isn't exactly huge. It does make a difference if you really want to run full-bore, but who wants to do that on the TAT? Not me....

    I agree with your plan of keeping the stock exhaust. While I appreciate the boost in performance, weight savings, and the throaty tone of my White Bros unit, the stock unit is less bothersome to others along the way. It's a benefit to be able to sneak around without people being able to follow you by your sound. And as Dave says in his mod, his particulars apply to a bike that's been opened up, that of course including performance aftermarket exhaust.

    As for jumping into mods, I would be focusing on what particular weaknesses you have personally experienced and wish to address. These guys come a bit lean from the factory in order to pass exhaust emissions standards imposed by our illustrious Federal government. From my experience, what I'd do is exchange the stock #50 pilot jet for a #55, and see how she runs for you. Then based on your anaylsis of the effects of this change, you can refocus your efforts. I'm expecting you'd find this quite acceptable performance to run the TAT.

    What is your schedule & plan for running the TAT?
  17. ONandOFF

    ONandOFF more off than on

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    I know.... it's hard to keep your hands off the bike when conditions inhibit riding it. :deal

    Oh yeah? Well, from the pictures, it doesn't look too sucky, so I'm not the least bit sympathetic! :bluduh


    The basic prinicples are the same for any bike with a carb. You can make mods to get more air and others to get more gas, Coordination is the key, because it is the ratio of gas to air that you want to optimize for your given criteria. Once you know what affects what, and how, and are able to feel a lean, good, and rich condition, you just make a corresponding adjustment and dial it in. :thumb
  18. ONandOFF

    ONandOFF more off than on

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    Oh my gosh... near Mt. Pisgah, I see...
    I'm ready! Gonna put my gear on now... :clap
  19. chipbl

    chipbl Been here awhile

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    Oct 12, 2009
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    Shouldn't be any difference in model years. I think that may have just been the bike he had at the time to do the mods on. I did all of it exactly as it was laid out on my '08 with no problems and did the TAT through Moab that way. You could take a few extra jets for the high passes as I did have to pay a little extra attention to keep it running, but not mandatory. Who wants to crack open a carb on the trail anyway, unless absolutely necessary. Good luck and have fun!
  20. sc-razor

    sc-razor Long timer

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    I always crank my idle up in Colorado and that helps a lot.