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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » BB&D Archives » Archive through May 31, 2014 » Stalls under heavy braking « Previous Next »

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Lloydxt
Posted on Thursday, May 08, 2014 - 12:08 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

09 XT 32,000 miles

On my way to work my bike stalled twice after semi hard breaking. Bike was low on fuel but the fuel light hadn't come on yet, I filled up with gas and made it to work. On the way home I tried not to brake too hard. When I was almost home I hit the brakes real hard and it didn't stall until I came to a stop and then just died. This has never happened before and I've ran it a lot lower on fuel.

I did a search and all of the info that comes up is about starving the fuel pump which was fixed in 2005.

Anyone experience this with or have any ideas?

Thanks
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Froggy
Posted on Thursday, May 08, 2014 - 12:21 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The issue may be as simple as your clutch switch. If my theory is correct, the switch has malfunctioned and the switch thinks the lever is in the engaged position regardless if it is or not. When you are not on the throttle, the IAC is the only way the engine can breathe. The clutch switch tells the bike you are trying to move forward and it will feed more air into the motor. If your switch failed, it won't correctly transition to idle, and you get a stall.

My second theory, the IAC may need to be cleaned out - http://www.badweatherbikers.com/buell/messages/142 838/634269.html
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Marc
Posted on Thursday, May 08, 2014 - 09:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have experience this stall at track days on my 06 Uly. Hard braking for a corner with less than half a tank. Momentum of hard braking and front end dive drives gas to the front and starves your pump which is at bottom in back.

Fill your tank and try your hard braking test again. You may just be fighting the laws of physics! Physics will always win.
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Lloydxt
Posted on Wednesday, May 21, 2014 - 06:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Cleaned IAC, very dirty but didnt help.

New clutch switch, but stupid tiny screw stripped during removal so I took off switch entirely until I can drill it out, no difference.

Any other ideas?
Thanks!
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Hughlysses
Posted on Wednesday, May 21, 2014 - 06:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I think you need to have the switch installed to test Froggy's theory. Switch removed would be same as clutch engaged position.

If that's not it, check the wiring harness under the air box. It may be that as the isolators flex under heavy braking, the engine is stretching the harness and it's worn through at some point, shorting to ground when this happens.
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