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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Troubleshooting (Poor Starting/Running/Handling/Ride Issues) » Archive through November 06, 2011 » 08 xb12x mild bucking and jerking « Previous Next »

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Xbclaw
Posted on Sunday, March 13, 2011 - 11:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
hello fellow bikers. new to this site and buells. my xb12x bucks and jerks in lower gears between 2500 and 3200 rpm with a steady throttle position. Any suggestions on a cure?
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Froggy
Posted on Sunday, March 13, 2011 - 11:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
What modifications have been made to the bike?
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Froggy
Posted on Monday, March 14, 2011 - 01:02 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Xbclaw, you may need to recreate your account. We had some difficulty with the forum and had to restore from a backup, it appears that your account may be deleted. I would email you but I do not have an address on record anymore.
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Xbclaw
Posted on Monday, March 14, 2011 - 08:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
thanks froggy. bike is completely stock, did a tps reset no help. bike runs great in 4th and 5th @ hiway speed, just low gears and little throttle surging is continuous. ecmspy correct the problem?
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Froggy
Posted on Monday, March 14, 2011 - 08:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
It does sound like a fueling related issue, most likely due to the way they run the bikes lean to pass EPA testing. Aftermarket exhausts make this worse. You can use ECMspy/Tunerpro to tune it out if you know what you are doing, but even that will take a good investment with time. Erik Buell Racing has a nice pre programmed ECM that will work great with your stock exhaust and fix the lean issue you are experiencing.

http://www.EBRacing.com/shop/product179.html
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Jjellyneck
Posted on Saturday, August 20, 2011 - 10:23 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Had the same situation. The dealer I bought my bike from (Wes at Pink Gorilla in Austin--great guy) hooked up the ECM Spy and slightly richened up the low RPM area. Night and day difference. It runs great now.
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Mesozoic
Posted on Tuesday, October 11, 2011 - 11:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Something I found that works really great is to modify the Front Cylinder Correction table. I added 2% to the curve and the bike runs a lot better with less or no jerking at all.
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