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Buell Forum » XBoard » Archive through April 05, 2019 » Buell XB9R stutter on accel « Previous Next »

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Ishampadron
Posted on Thursday, October 04, 2018 - 06:28 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I just finished putting my XB9R back together. It was originally an 03 with a race ECM. It now has a 07 motor. I have done the TPS reset and it idles great. Once I take out out it will accelerate fine and then randomly it will stutter, feels like a misfire. I only get that symptom when i'm above 3k rpm. Battery connection is tight and everything I can see looks good. I'll check the coil to see if it has 0.5 resistance tomorrow. Is there anything else I should look at?
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Midknyte
Posted on Friday, October 05, 2018 - 12:39 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Intake seals?
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Ishampadron
Posted on Friday, October 05, 2018 - 08:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I figured if it was that it would exhibited in a poor idle. However, i'll look into it.
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Midknyte
Posted on Friday, October 05, 2018 - 12:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
I don't think that it caused poor idling for me either, but I did get poor acceleration.

It is said that you can check it easily by shooting some wd40 or brake cleaner near the intake seals while it's idling and if sucks any it you will get a bit of rev off of idle. If you use brake cleaner, but sure to clean it off after.

The seals do dry up and wear out over time..
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Tleighbell
Posted on Thursday, October 11, 2018 - 11:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
did you read John Vreede's post in the knowledge vault about proper grounding? He says grounding problems are responsible for 90++% of running issues.
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Midknyte
Posted on Thursday, October 11, 2018 - 02:48 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Good voltage is needed too - an older battery might still start your bike but if the running voltage is low, you'll get misfires from that also. Bugs the hell out me me when I'm dipping into a turn and it happens...
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