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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through April 15, 2009 » Lags at 4000 till 4500 « Previous Next »

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Rekrab
Posted on Wednesday, March 11, 2009 - 09:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

08 uly, Developed a stumble at 4000 rpm and takesoff again at 4500. Plugs , ECM, air cleaner, all are new or ( ECM ) updated. No codes show up. So o2 sensor and or exhaust valve? So far two dealers no fix and I need some advice on what they might look for. Thanks, Rekrab.
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Smiley1eye
Posted on Monday, March 16, 2009 - 12:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Had a very similar problem.

http://www.badweatherbikers.com/buell/messages/384 2/379371.html?1211015522

After working with a guy in Ohio that has hacked the ECM for the 1125 (we share the same ECM) we decided that it is the EPA lean built into the fuel maps.

I adjusted the AFV on mine, it went away but developed some other issues, mainly running rich which gave me some undesirable traits at low RPMs. So I hooked back up the O2 sensor and let it relearn itself back into the regular setup.

But that's what I would say your issue is. As long as nothing else is acting up anyway.
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Raiken1
Posted on Tuesday, March 17, 2009 - 04:00 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey Ive got a 2003 xb9s and just bought it 2 weeks ago. Its has the pro series race kit and it not running right. The low end is pretty pitiful and has little to no powerband. No other problems tho. If anyone has any ideas?? Thanks
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