It blows my mind that a bike can just start doing that...can't you manhandle the bars back into submission if you fell it starting? Would that be more probable on a bike with worn steering head bearings?
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Why Millions Buy Harley-Davidson Motorcycles
- Thread starter TK4
- Start date
BigEvilDoer
Well-known member
IT's an inherent design flaw. Plain and simple. The video showed the physics of why it happens.
You may think you can manhandle the bars back straight, but unless you're Hafthor Bjornsson (sp? - The Mountain, from Game of Thrones) its highly unlikely. Just like counter/push steering. You think you can turn the handlebars at speed, but the gyroscopic effect of the wheels makes it pretty much impossible.
J_F
Guest
that makes it worse, as does braking
the bike will want to stabilize itself
unfortunately that often involves chucking the human off
The only one I see butthurt is Ryan. In his last six months of video
BigEvilDoer
Well-known member
For once in a blue super moon of a millennium, I sort of agree with ToSlow... wtf is wrong with me?
If you get into a tank slapper, absolutely, roll on the gas as hard as you can, get your weight back and unload the front tire as much as possible to regain control...
Considering the inherent engineering design flaw of this particular motorcycle, I'm not convinced this technique will work.
Who's butthurt?
I thought the video was great. I was actually going to post it here myself.
Mad Mike
Well-known member
Yikes! I guess you've never had one.
1) Hold on tight, squeeze the tank with your knees, keep feet on pegs
2) Lean forward to add fork weight.
3) Roll off the throttle, no brakes or downshifting.
The weave will disappear. Rolling on could take you to tank slapper.
J_F
Guest
suppose it depends on the cause, what to do
I added a taller screen to the FJ09 which caused aero-induced speed wobble
over 170 the bike was dangerously un-ridable
only way to safely correct that was as MM suggests
gently roll off, body secured to chassis, and do not fight the bars
edit: wonder if the hit the gas suggestion is coming from towing a trailer?
in that case, a weaving trailer, def floor it to straiten out
don't think that works on a bike
I added a taller screen to the FJ09 which caused aero-induced speed wobble
over 170 the bike was dangerously un-ridable
only way to safely correct that was as MM suggests
gently roll off, body secured to chassis, and do not fight the bars
edit: wonder if the hit the gas suggestion is coming from towing a trailer?
in that case, a weaving trailer, def floor it to straiten out
don't think that works on a bike
Mad Mike
Well-known member
Yikes again! The only way to break a tank slapper by unloading the front with roll on is to wheelie the bike. Lean forward to load the front wheel and rolling off is the best choice. Even then, you're coming down through the same speed zone so unless you dump speed before ending your wheelie you're doomed.For once in a blue super moon of a millennium, I sort of agree with ToSlow... wtf is wrong with me?
If you get into a tank slapper, absolutely, roll on the gas as hard as you can, get your weight back and unload the front tire as much as possible to regain control...
Considering the inherent engineering design flaw of this particular motorcycle, I'm not convinced this technique will work.
Next time you're at a shopping mart, find a cart that has a wobbly wheel. Start the wheel wobble, then:
1) start running, see what happens.
2) Have someone lean on the front of the cart, keep speed same.
3) Slow the cart.
Tell us what happens.
Video please.
Mad Mike
Well-known member
I have a couple of bikes that will weave on queue -- so foes everyone who owns a 70-80's bike that will do the ton. Sold my H2 about 30 years ago after watching my riding buddy weave his off Kennedy Rd on the curve lust north of Stouffville Rd.
My GL1000 had a predictable weave at 130kmh. I lightened the rear by 60lbs by removing the 'beer box' and trailer hitch and it fixed the problem. I've taken her to 160 smooth as silk. My XV920R has a bit at 140 when I have the windshield mounted. I've never experienced personally a weave on anything built after 1990
My GL1000 had a predictable weave at 130kmh. I lightened the rear by 60lbs by removing the 'beer box' and trailer hitch and it fixed the problem. I've taken her to 160 smooth as silk. My XV920R has a bit at 140 when I have the windshield mounted. I've never experienced personally a weave on anything built after 1990
Harley has been sued several times, unsuccessfully, over the "death wobble".
I don't know if the still are, but for a long time the wheels on a dyna were offset by 1/2". Not a problem.
If there was ONE cause of tank slappers or wobble, then there would be ONE solution
Sorry, multiple causes, multiple solutions.
Problem being: as you're wobbling down the road at 60mph, diagnostics are shakey at best.
One cause: All springs have a "harmonic". If the front and rear springs have a sympathetic harmonic, you get an oscillation and tossed from the bike.
I don't know if the still are, but for a long time the wheels on a dyna were offset by 1/2". Not a problem.
If there was ONE cause of tank slappers or wobble, then there would be ONE solution
Sorry, multiple causes, multiple solutions.
Problem being: as you're wobbling down the road at 60mph, diagnostics are shakey at best.
One cause: All springs have a "harmonic". If the front and rear springs have a sympathetic harmonic, you get an oscillation and tossed from the bike.
J_F
Guest
rhythmic, side to side weave that increased in frequency and intensity as speed went up
never got to it, but sure felt like it would end up a tank slapper if you went faster
the bike was noted for that tendency, Yamaha put a half fairing on a naked not designed for one
the taller screen made it worse... understand the GT version improved the aeros
A lot of 1800 Wings have a bad decel wobble. People have spent tons of money on cures like traxxion susp kits.Traxxion has made a lot of money selling people stuff they don't need.
The biggest complaint is that it wobbles when they take thier hands off the bars.
The easiest fix....... Don't do that!
The biggest complaint is that it wobbles when they take thier hands off the bars.
The easiest fix....... Don't do that!
Goldwings needed a front tire with a solid rib down the center of the tire, like a Conti.
If it had a tire with alternating blocks it would "walk" or wobble... and there was nothing you could do about it but hang on.
If it had a tire with alternating blocks it would "walk" or wobble... and there was nothing you could do about it but hang on.
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