letting off the throttle on a sweeper - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 23 Old 07-12-2014, 08:33 PM Thread Starter
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letting off the throttle on a sweeper

I rode to Cleveland for lunch today and was getting bored after a few hundred slab-o-miles. Hit a ramp from one Interstate to another a bit hot, and thought, what the heck, what happens at x if I just let off the throttle. Wow. The front end started bobbin' an weavin' like it was in a heavyweight bout. I have never experienced that before (normal for me would be to drag the rear brake a bit) and was pretty surprised by the amount of movement. It all came out fine (just let go of the bars a bit) but it was an illuminating moment to realize that you don't have to be anywhere near traction limit to experience the wobble.

Bob
07 Wee
10 NT 700

Last edited by BobAgain; 07-12-2014 at 08:42 PM.
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post #2 of 23 Old 07-12-2014, 09:57 PM
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Your rear tire has a larger contact patch than your front, so that's why you smoothly roll on the throttle to come out of the turn. When you do that, the weight shifts to your rear tire and it carries about 30% more of the weight, which really helps considering the larger contact patch. If you roll through a corner fast and avoid the throttle, it's more nerve wracking than if you trailbrake and get on the gas after the apex.
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post #3 of 23 Old 07-12-2014, 09:59 PM
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Quote:
Originally Posted by BobAgain View Post
I rode to Cleveland for lunch today and was getting bored after a few hundred slab-o-miles. Hit a ramp from one Interstate to another a bit hot, and thought, what the heck, what happens at x if I just let off the throttle. Wow. The front end started bobbin' an weavin' like it was in a heavyweight bout. I have never experienced that before (normal for me would be to drag the rear brake a bit) and was pretty surprised by the amount of movement. It all came out fine (just let go of the bars a bit) but it was an illuminating moment to realize that you don't have to be anywhere near traction limit to experience the wobble.
have you checked the steering stem bearings for slop - on an 07 Wee they may be sloppy - it depends on mileage and type of use

e.g., both 2007 Wees that O have owned

41k mile - bearings notched (new to me, replaced brgs with tapered rollers))
20 k miles - bearings smooth, sold as-is

Current Bike: 2007 ABS Wee, rebuilt forks with Cogent DDC, Elka rear shock, tapered roller steering stem bearings, fork brace, Admore top box lights, LED side-only turn indicator lights, Powerlet outlet, frame sliders, Givi windscreen, Givi top box.

Prior Bikes: 2003 EX250, 2007 DL650 (non-ABS)
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post #4 of 23 Old 07-13-2014, 09:57 AM Thread Starter
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Originally Posted by kiwi_outdoors View Post
have you checked the steering stem bearings for slop - on an 07 Wee they may be sloppy - it depends on mileage and type of use

e.g., both 2007 Wees that O have owned

41k mile - bearings notched (new to me, replaced brgs with tapered rollers))
20 k miles - bearings smooth, sold as-is
yep, nice new steering bearing a year ago and added a scotts steering stabilizer this year.

Bob
07 Wee
10 NT 700
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post #5 of 23 Old 07-19-2014, 03:19 PM
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Now ponder the fact that, although keeping the throttle open in a turn is second nature to you and me, about 95% of riders out there have no idea you shouldn't chop the throttle in a turn.

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post #6 of 23 Old 07-19-2014, 04:39 PM
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Originally Posted by bwringer View Post
about 95% of riders out there have no idea you shouldn't chop the throttle in a turn.
Not sure why you'd make that assumption.

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post #7 of 23 Old 08-06-2014, 03:47 PM
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Even with good bearings and a stabilizer you got the wobble! That's interesting. I wouldn't have guessed it being that strong.
I'm just guessing but chopping the throttle has to be the 1st instinctive thing to do in a panic situation especially with little to no training.

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post #8 of 23 Old 08-06-2014, 10:55 PM
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Quote:
Originally Posted by bwringer View Post
Now ponder the fact that, although keeping the throttle open in a turn is second nature to you and me, about 95% of riders out there have no idea you shouldn't chop the throttle in a turn.
I have to agree with this... I commute from hwy thru the city and to hwy again going to work and see it all the time with other bikes on the ramps...going in hot and then the front end weaving when they drop the throttle instead of dragging the rear brake and/or countersteering a little more..... mind you they are usually squids ....

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post #9 of 23 Old 08-07-2014, 01:30 AM
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This is fascinating. I've always been worried at higher speeds about the front end wobbling on my Vee. I recently spent 140 minutes in 7 sessions on a local race track with speeds up to nearly 130 mph and lots of braking in corners and such, used up my chicken strips entirely and NEVER ONCE did the bike even hint of wobbling. Do you have a fork brace in addition to the steering dampener? My Vee is lowered about an inch plus front and rear. Do you have the rear lowered? Something is triggering the wobble. I'd sure like to know what it is.
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post #10 of 23 Old 08-07-2014, 01:32 PM
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The OP deliberately triggered the wobble with poor technique -- I gather it was sort of an experiment to find out exactly what would happen with this bike. He knew how to stabilize the bike and everything turned out fine. And now he knows something about where the instability limit is on that bike.

Instability is just what happens with a motorcycle when you chop the throttle midcorner -- it's not necessarily an indication of a problem, although the exact response varies tremendously with the bike, and mechanical problems can make it a lot worse. Sportbikes with steep, sensitive steering geometry will be affected most by poor technique or worn tires, shocks, bearings, etc.

Just as you shouldn't steer into a brick wall and expect happy results, you shouldn't expect a motorcycle to stay stable when you chop the throttle deep into a fast corner.

Bear in mind that there are techniques for slowing down and braking midcorner ("stomp the rear brake as hard as you can" is the most common but mistaken reaction), but we weren't discussing those -- we were talking about chopping the throttle.

2002 Suzuki DL1000 V-Strom, Dark Metallic Space Blue
1983 Suzuki GS850G, Cosmic Blue
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