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Discussion Starter #1 (Edited)
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.
 

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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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bobbin

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
 

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Discussion Starter #4
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.
 

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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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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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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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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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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.
 

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Discussion Starter #11
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.

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Yes, it was an experiment (born a bit from the boredom of the ride and also having a great spot to play "what if") I've been watching Keith Code's videos and assorted others. For the record, the bike has new(ish) head bearings, front is dropped 12 mm, a Scott's stabilizer and Rick's fork brace.
 

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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.
Yes, but my DL1K2 (same fast color as yours :mrgreen:) wouldn't wobble even if you chopped the throttle while dragging pegs at 80K miles. I think he has other issues that are causing this. Mine had modified forks and Wilbers shock (longer than stock) but no brace or stabilizer.

Gustavo
 

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Yes, but my DL1K2 (same fast color as yours :mrgreen:) wouldn't wobble even if you chopped the throttle while dragging pegs at 80K miles. I think he has other issues that are causing this. Mine had modified forks and Wilbers shock (longer than stock) but no brace or stabilizer.

Gustavo
My K2 will definitely do it every time if I chop the gas in a corner.... the loading on the tires/suspension changes completely when you do it.... you state you have modified forks and shocks, so not comparable... only changes on mine are drop in 1.0 front springs...Ricks fork brace....huge difference, but not much wrist distance, between rolling off the throttle and it cutting off hard...more of a technique issue than anything being wrong...definitely doing steering head bearings this winter (ball bearings in a steering head...seriously??) and hope to afford a stabilizer someday...until then, it's just "hold on, giver and go" :thumbup:
 

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In keeping with "The Code" repeat after me.... "Once the throttle is cracked on, it is rolled on evenly, smoothly, and constantly throughout the remainder of the turn."
 

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In keeping with "The Code" repeat after me.... "Once the throttle is cracked on, it is rolled on evenly, smoothly, and constantly throughout the remainder of the turn."
In a perfect world I agree 100%... but when you're on a ramp that is semi-blind and there is traffic.....unless you want to be part of a semi's bumper, you're gonna end up rolling off the gas sometimes... just sayin' :yikes:
 

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hello,
I am new to biking, just got a v strom 650...have gone through classes, got my license, and i am riding as much as i can.
Question: would you mind explaining what chopping the throttle means? my impression is, it means you roll off the throttle, and in this context you guys are saying: do not roll off the throttle deep into a fast corner...did i get it right?
 

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I think what "chopping the throttle" means is letting it off completely and suddenly rather than rolling. I gently roll on and off the throttle in conjunction with using my rear brake mid corner to help control my line, but sudden changes produce sudden, often painful, results. Anything that causes a sudden shift in weight onto your front wheel while you're banked into a turn has the potential to go very badly.
 

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Discussion Starter #18
In keeping with "The Code" repeat after me.... "Once the throttle is cracked on, it is rolled on evenly, smoothly, and constantly throughout the remainder of the turn."
:thumbup:

Andrew? son?? my son said exactly that to me as I recounted my tale....and of course, it is correct!! also it is the specific reason why I decided to play the "what if" game.
 

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hello,
I am new to biking, just got a v strom 650...have gone through classes, got my license, and i am riding as much as i can.
Question: would you mind explaining what chopping the throttle means? my impression is, it means you roll off the throttle, and in this context you guys are saying: do not roll off the throttle deep into a fast corner...did i get it right?
As said, it means shutting the throttle quickly. Not recommended while in a turn.

You want to slow on the turn entry, then roll on some throttle as you exit the turn. This stabilizes the bike. Try to avoid adding throttle until you can see your turn exit. I know, the traffic ahead can do unexpected things.
 

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Code's bike/class teaches a roll on/off of the throttle, slow and steady. Not full throttle, then let go of said throttle. That usually does not end well for most riders.

After watching twist of the wrist 2, I have practiced everyday. I know know I can lean the Wee a LOT more than I once could.
 
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