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Buellxb Forum

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  1. J

    Richer fuel map for a standard XB

    tleighbell - I've got that 'Race map for a stock XB12' from Buelltooth. Their words were "This mapping was transposed from an ECM for a 2008 model. Let me know how it works." Haven't been game to try it yet, esp not since its running so well now. Locking the AFV, from what I can gather...
  2. J

    Richer fuel map for a standard XB

    Tried the stock limits for AFV with midpoint voltage on O2 sensor at 0.5V and it had an edgy-ness to the throttle response that wasn't there with the 107% locked AFV. Went back to upper and lower limit AFV of 107%, and kept the 0.5V midpoint voltage and its sweet again. Funny thing though, the...
  3. J

    Richer fuel map for a standard XB

    An update after naff winter weather cleared. 1. Fuel mileage is the same (51mpg) with the AFV locked at 108% as when I was running with the standard settings (which allow the AFV to find its own level), so I guess that answers my question above - the ECM did drive the fueling in closed loop back...
  4. J

    Fixing Earthing Problems - Why and How

    Hi mmcn Thanks for looking but it's still confusing me a little. Can you go look at your bike and find where the ECM earth leads are bolted to the frame - they're the ones under the seat, that exit the wiring loom at the same point and both are crimped into one lug. Are these wires taken to...
  5. J

    Fixing Earthing Problems - Why and How

    Just confirmation of Kona's recollection that the SS has the ECM earthed to one side of the rear subframe and the battery to the other will be enough. If true then people can go look whether their bike is like a Uly or like an SS, and do the appropriate thing. If not we'll have to wait for...
  6. J

    Stability issue / wobbly

    Definitely agree with new tires. My bike was handling like a pig. Had to push it into a corner and then hold it so it didn't turn in too much like Cooter said. Tried servicing the suspension ($1200US) for no real improvement. Found a big part was rusty steering head bearings which meant was...
  7. J

    XB misfire at constant RPM cruising (~3500 RPM).

    I think the diode that's in the fuse box should protect the ECM from reverse current, no matter how your earth wires are arranged - jv
  8. J

    Fixing Earthing Problems - Why and How

    Hey all I'm glad people think its useful BUT... it would be much more useful if info on Lightnings and Firebolts ground locations were here too. For instance Kona said he thought the Lightning had the battery earthed on one side of the rear subframe and the ECM on the other side. If that's...
  9. J

    Ulysses rear shock - maintenance?

    $200US is CHEAP. Go for it. Its a new spring you need first and maybe seals while he's got it apart. Not sure any other 'tuning' will improve handling - it didn't on mine, but if that's all in the $200 why should you care. That amount of work on the rear shock alone cost me equiv $800US! - jv
  10. J

    Ulysses rear shock - maintenance?

    Hi Suspension setup according to the owners manual is only valid of the shock is not worn. My 07 Uly with 42k miles on didn't handle like I wanted, and I did get the shock rebuilt (details here https://www.buellxb.com/forum/showthread.php?54246-Getting-a-Ulysses-to-handle-like-an-XB*R) My...
  11. J

    Fixing Earthing Problems - Why and How

    Thanks for taking it as intended. If you know this stuff then I agree, its too much to read, but if you don't, then you could be glad for the extra detail. You never truly understand something until you know 'why', then you can evaluate someone else's 'how' and see if it makes sense - jv
  12. J

    XB misfire at constant RPM cruising (~3500 RPM).

    Hi I've just posted a whole lot on fixing earthing problems wrt chasing a midrange misfire, but there's one thing I didn't include in that 'novel'. I found that the lug that both wires from the ECM is crimped to, has a high resistance (like 7ohms when it should be nearly zero), and 0.7ohms is...
  13. J

    Fixing Earthing Problems - Why and How

    HOW The Airforce earth bonding method is as follows: • Clean all contact surfaces with Scotchbrite or ~240 grit sandpaper, back to bright metal. Edit : Don't remove the tin/solder or Nickel coatings from the brass or copper lugs as the coating serves a purpose in isolating metals of different...
  14. J

    Fixing Earthing Problems - Why and How

    This is a very general topic so I put in the most read forum even tho the subject bike is a Uly - sorry if that's not right, and can someone tell me how to get rid of the thumbnails - jv A light throttle/low speed/moderate rpm cough or hiccup or misfire or stutter or pop or whatever you want to...
  15. J

    Richer fuel map for a standard XB

    Thanks Gunter. So does this also mean that, even when both upper and lower AFV limits are the same, that the ECM will still drive the fueling in the closed loop area toward stoichiometric - jv
  16. J

    Richer fuel map for a standard XB

    No problem Cooter - when you heavyweights talk, we all learn. I wasn't endorsing the sensor mod trick devices, just illustrating that there are a lot of people who find the emission regulation compliant fuel maps unsatisfactory, as do I, if it runs nicer when richer. Even you said you'd had...
  17. J

    Richer fuel map for a standard XB

    I guess you may be lucky Ready. to have a bike that doesn't do this. The evidence from lots of other owners on this site is that they do have 'lean stumbles' or 'lean misfires', even in stock tune, and there is a whole industry built up around providing stock bikes with a way to get their fuel...
  18. J

    Richer fuel map for a standard XB

    Gunter, I believe something has been lost in translation. By '...running lean...' I did not mean the the standard fuel map in the Buell was making it run at an AFR >14.7, but that is was running leaner than would give most enjoyable riding, which most people say is about 13.6:1. My bike ran...
  19. J

    Richer fuel map for a standard XB

    Thanks Cooter, but its not quite what I was after. Buelltooth say it's Baro kit only works on 03-07's if you are not running the Active Muffler Control and have an aftermarket muffler & ECM tune: I have a stock exhaust and want to run the AMC. I'm hoping that someone out there has optimised the...
  20. J

    Richer fuel map for a standard XB

    I’m looking for a richer fuel map for my bog standard ’07 Uly, as if the factory tuned it for best running without regard to emissions. With the standard map it misfires occasionally at small throttle openings, like when I'm idling along in slow traffic. It also gives a sense of not running...
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