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Buell Forum » THUMPer Forum » Buell Blast Thumper Knowledge Vault » Diagnosing problems: » Flat spots around 20-30 Mph « Previous Next »

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Bluv21
Posted on Sunday, April 01, 2012 - 05:11 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ok so I replaced the boot and changed the jets to a 45 and a 170 as recommended and I adjusted the primary chain. I took it for a test ride and I am getting flat spots in acceleration around 20-30 Mph. The bike seems to sputter and surge and then it evens out and does it slightly again around 40-50 Mph. Any recommendations of what to do next?
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Johneblast
Posted on Sunday, April 01, 2012 - 11:32 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Change the plug. I fouled mine just before I changed my jets. That could be what is starting to happen.
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Ezblast
Posted on Monday, April 02, 2012 - 01:31 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

clogged needle - partially clogged?
EZ
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Bluv21
Posted on Monday, April 02, 2012 - 08:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The carb has been recently cleaned by HD but I am unsure about the needle. Which needle are you talking about, needle jet and needle jet holder or the jet needle in the slide? I sent you an e-mail about shimming the needle. Could this be a cause as well? Thank you.

(Message edited by bluv21 on April 02, 2012)
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Ezblast
Posted on Monday, April 02, 2012 - 11:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

oui
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Bluv21
Posted on Tuesday, April 03, 2012 - 10:40 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thank you for all of the support EZ! On a related note for anyone who is interested. Lowes has good #4s brass washer for this application. They are sold in packs of 12 and thickness is pretty consistent (although I do not know what nominal is supposed to be). I measured the thicknesses of each washer and they ranged from .0235 to .025 so I took the two good .025 in. washers and lightly sanded the burs left from manufacturing.
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