Runaway Throttle S&S Super E Carb

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Apr 3, 2011 | 03:37 PM

#11

Dr.Hess

Seasoned HDF Member

Joined: Aug 2007

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From: NW AR

Were you turning the grip back to the idle position, but the carb's butterfly was still WFO? Or were you unable to turn the grip back from WFO?

Apr 3, 2011 | 03:54 PM

#12

Plow64

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Stellar HDF Member

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From: Northern VA

Quote:

Originally Posted by Dr.Hess

Were you turning the grip back to the idle position, but the carb's butterfly was still WFO? Or were you unable to turn the grip back from WFO?

Yes, I turned the grip back to idle, but the carb remained wide open.

Apr 3, 2011 | 04:44 PM

#13

NickD

Road Master

Joined: May 2007

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On almost every carburetor I've seen there's a return spring in case your throttle cable breaks. It's there to return the carb to idle in just such a case. Something is seriously wrong somewhere as there is simply no mechanical independent action that will snap a carburetor to WOT. The only thing I can think of is you have the throttle cable on the idle cable side of the carb plus you wrapped the handlebar side the wrong way. But that sounds almost impossible.

Try this: Undo the cable completely from the carburetor and start the bike. Throttle the motor using only your hand on the carburetor cable fitting. If it doesn't replicate the problem the issue is in your throttle, throttle sleeve, or the way the cable is routed. Are you sure turning the handlebars isn't the problem, I mean is the throttle cable long enough?

Apr 3, 2011 | 05:47 PM

#14

miacycles

Elite HDF Member

Joined: Sep 2007

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From: Bluffton, South Carolina

Question were the Barnett cables for an S&S or a CV . They have different free lengths and can cause problems.

Apr 3, 2011 | 05:57 PM

#15

Nate88hd

Novice

Joined: Mar 2011

Posts: 19

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From: Crystal Coast, NC

I had the same problem. Cable was binding after the 90 from the lever at the first bend in my handle bars. didn't look like enough to cause a problem but definitely the culprit.

Apr 3, 2011 | 08:16 PM

#16

Jim Kraft

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Joined: May 2009

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From: Middle of Kansas

Does that carb have a slide like the CV carb? Sounds like maybe high vacuum at the vacuum chamber pulling the slide and needle up to wide open, independent of throttle position. Just a thought. That is the only thing I can think of that would only do it while running and be independent on throttle position. Is it possible you left the spring out above the vacuum piston? I think this might cause your problem.

Last edited by Jim Kraft; Apr 3, 2011 at 08:25 PM. Reason: Added info

Apr 15, 2011 | 05:31 PM

#17

Plow64

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Joined: Jan 2007

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From: Northern VA

Just wanted to report back that the issue has been resolved. I took the bike to Skips Custom Cycle in Winchester VA for a dyno tune and told them about the stuck throttle issue. They ended up replacing the float bowl and changing out one of the needles. There were no issues with the cables. The bike is running great now. Thanks to all for offering advice.

Last edited by Plow64; Apr 15, 2011 at 05:35 PM.

Apr 15, 2011 | 09:07 PM

#18

98glider

Road Warrior

Joined: Sep 2006

Posts: 1,605

Likes: 82

From: nj

I am having a similiar problem with my s& s e. my carb would idle alittle higher when she gets warmed up at idle. When I put it in gear and play with the throttle idle drops. When I am in neutral and give a little gas the idle does not come back down only when I put it in gear and play with the throttle and drive she will come down Checked all cables for binding check the return spring.Everything looks good any help Thanks