The 'Death Wobble'

dextasy

Well-known member
It's from 2011 so I'm not sure if it's a repost, but I found it interesting. Thoughts?

http://www.kpho.com/story/14896060/some-harley-motorcycles-plagued-by-death-wobble-5-16-2011


The last thing a rider wants to do on a motorcycle is lose control, but that's what some Harley-Davidson riders say happened to them.

To riders such as Vince Herre, the bikes are a status symbol. "I like it just because it's Harley-Davidson," Herre said.

Other riders, such as Cliff Anderson, said there's a certain amount of homegrown pride.

"It's an iconic piece of America," he says.

Riders such as Blake Tomlinson said they think riding a Harley-Davidson is a way of life.

"To drive one is the ultimate sense of freedom," Tomlinson said.

To Jerry Costa, it was only a matter of time before he owned one.

"I had Triumphs, a Suzuki, Hondas and Yamahas. I had all of them before I ever had a Harley," said Costa.

The Peoria biker has been riding for 40 years.

"This is my fifth Harley," Costa said.

But no amount of road experience could have prepared Costa for what happened in October along a scenic highway just south of Prescott.

"I wasn't doing anything out of the ordinary. I wasn't doing anything I hadn't done a thousand times before. I had been on that road a couple hundred times," Costa said.

Costa said his speed was about 25-30 mph when, "The whole bike started shaking. I had no idea why the bike was vibrating like that, and it wasn't a little vibrating. I never felt anything like that in my life."

"I got this thought in my head I'm going over the ravine, and I don't want to go down," Costa said.

Costa did go down and was flown to a Phoenix hospital, where he coded and then slipped into a coma. Five days later, he awoke with a quadruple compound leg fracture, eight broken ribs and a punctured lung.

His massive Harley-Davidson Road King was totaled.

Costa blames faulty equipment for the accident, but Harley blames him.

"They say it's operator error," Costa said.

Costa is not alone.

A CBS 5 Investigation found similar incidents across the U.S. The possible equipment malfunction Costa describes has become known as the Harley-Davidson Wobble, or "Death Wobble."

A camera mounted on a Georgia state trooper's police-issued Harley shows Officer Richard Barber traveling 90 mph along an interstate. His 2007 Harley Electra Glide begins to shimmy and wobble. Eventually, Barber is able to stop the bike safely.

But a Raleigh, N.C., police officer was not so lucky. In 2002, 30-year-old Charles Paul was thrown from his Harley Electra Glide after it began to wobble. He died, and his family later settled a wrongful death suit with Harley-Davidson in 2008.

Harley's have been widely used by law enforcement. But the California Highway Patrol decided not to put their troopers on Harley's after testing the bike by comparing it to BMW bikes. A 2006 test track video shows the Harley side-by-side with the BMW. In the video, you can see the Harley wobbles when heading into and out of turns. The CHP report also says the bike wobbled on the straightaways.

Court cases against the company have centered on these bikes: the Road King, Ultra Classic, the Electra Glide and FLH series. The suits focus on their patented design for keeping the engine mounted to the frame of the bike. Critics argue the system is susceptible to a side-to-side motion, causing a wobble.

Harley-Davidson does acknowledge that its bikes are susceptible to a weave or wobble -- depending on the bike's speed. But they said that this does not cause accidents, and that weave or wobble happens to other bike manufacturers, regardless if it is a Harley or not. Harley also said the wobble problem is worsened when riders add on certain parts and suggests people follow the owner's manual.

Jerry Costa said wobble is what happened to his bike, and it haunts him during his long days in physical therapy, where he learns how to do the simple task of moving his ankle again.

Costa can't sue Harley-Davidson because he's already settled with insurance, but he said he doesn't want a payout.

"That's not what I'm after. I want people to know about this. I don't want more people falling off these bikes," Costa said.
 
Geez... Potentially damaging the brand there.
Even without the wobble, I can't imagine the Harley winning in a head to head competition with the Beemers for the CHiP's. Maybe time for some young whippersnappers to redesign the HD, with heritage in mind but trying to incorporate modern performance.
 
Crazy how injured Costa got from going down at 25mph.

Arizona law requires helmets only on the youngest of riders. The worst of this guy's injuries is the coma, a head injury.

The rest, while painful, wouldn't be unusual even at low speed given that he had a heavy bike fall down with and likely on him. Even a bicycle rider could see those types of injuries with a low speed fall.
 
Crazy how injured Costa got from going down at 25mph.

Exactly why you should wear gear even when just in the city. I know a guy that broke his leg in 3 places just from falling off a bicycle at a stand still.
 
I had some crashes from my downhill skateboarding days where i was going 60 km/h+ just wearing knee pads, gloves and a helmet. Ye I had some nasty road rash but never broke anything. I guess it also helps to be in shape and not weight 300 lb.
 
I don't find this surprising in the least. Styling is the most important design criteria at HD. Handling is most likely way down the list, perhaps even an afterthought. No one buys a Harley for its handling and performance. I would suspect the steering geometry on these bikes is not quite right. Add in variables such as tire condition, inflation, road conditions, steering head bearing adjustment, etc, and suddenly you have a wobble.
 
I don't find this surprising in the least. Styling is the most important design criteria at HD. Handling is most likely way down the list, perhaps even an afterthought. No one buys a Harley for its handling and performance. I would suspect the steering geometry on these bikes is not quite right. Add in variables such as tire condition, inflation, road conditions, steering head bearing adjustment, etc, and suddenly you have a wobble.

Steering damper??? :-)
 
The fellow who taught me to ride spend a half hour discussing the wobble.
His advice. if you get it, start looking for a soft place to land.
 
https://www.youtube.com/watch?v=SSDihPynsBg

Jebus. That's just creepy. Not even a "speed wobble." Guy's just tootling along and the front end is all over the place. Interesting tie in on his part to the engine passing through 2000RPM.
 
Only time I've ever had something similar on one of my bikes was when my rim had a huge dent in it and it wasn't even this bad.
 
The fellow who taught me to ride spend a half hour discussing the wobble.
His advice. if you get it, start looking for a soft place to land.

In the old times (70's and early 80's) many of the bikes that I rode developed speed wobbles. The only way out was to twist the wrist hard. Slowing down only made matters worse.
 
https://www.youtube.com/watch?v=SSDihPynsBg

Jebus. That's just creepy. Not even a "speed wobble." Guy's just tootling along and the front end is all over the place. Interesting tie in on his part to the engine passing through 2000RPM.

That video is not what they are talking about. The "wobble" in that video is easily cured with the correct tire selection.

Here is a video of the " Harley wobble".
https://www.youtube.com/watch?v=Gmw6QppXnEY

It is only the big frame bike. It might be that the wheels are staggered about 1/2 on a "F" series Harley... been like that forever, and Harley has VERY good lawyers that have defended that offset more than once.
 
That video is not what they are talking about. The "wobble" in that video is easily cured with the correct tire selection.

Here is a video of the " Harley wobble".
https://www.youtube.com/watch?v=Gmw6QppXnEY

It is only the big frame bike. It might be that the wheels are staggered about 1/2 on a "F" series Harley... been like that forever, and Harley has VERY good lawyers that have defended that offset more than once.

That's disconcerting. Is that the frame or swingarm flexing?
 
I'd only have to experience that once and the Harley would be on kijiji.
 
The sonic booms from the loud pipes are actually lifting the rear tire off the ground, causing instability, even though they save lives.

I spent a day on a road king last winter in Cozumel, with passenger, tequila in the side bag, no death wobbles or anything out of the ordinary. It's not a bike I felt like pushing into a corner, was a very stable ride.

:bs:
 
That video is not what they are talking about. The "wobble" in that video is easily cured with the correct tire selection.

:shrug: So it's a POS Harley with a different "wobble." I see.
 
https://www.youtube.com/watch?v=SSDihPynsBg

Jebus. That's just creepy. Not even a "speed wobble." Guy's just tootling along and the front end is all over the place. Interesting tie in on his part to the engine passing through 2000RPM.

That happened on my ex500 if i took my hsnfs off the bars at 90+ until I changed tires.
That's either a bad tire, misaligned tires or just the wrong tire type.

Nowadays I've got hand guards catching wind and my fat *** causing wobbles at 130+ or 110 on my klr650 with transport trucks around. The struggle is real
 
Riding the lakeshore east of Newcastle with a couple of buddies one day , the guy ahead of me had a Harley Nite Train. As we were going over some bumps I could see his frame/ swingarm flexing and the front/ rear wheel going out of alignment.
Maybe that's why Harley riders don't wave.... it's just self preservation....
Saw the same thing at Mosport vintage weekend. Standing at corner 2 the vintage bikes with beefed up frames would pick a line and carry thru the corner just like modern bikes. But on the stock frame vintage bikes as they entered the corner, you could see the frame load up, and the front/rear wheel go out of alignment and suddenly the bike would suddenly snap to the right from the frame unloading. Sometimes they would be off track in the rhubarb.
 
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