Safe speed in a Kz.

  • MLMG
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  • See you in the wind.
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13 Jun 2023 11:20 - 13 Jun 2023 11:30 #885952 by MLMG
Replied by MLMG on topic Safe speed in a Kz.
Doing some research I found this video.



Luckily I weigh 130 kilos. 

 

1977 Kawasaki KZ1000 A1
Last edit: 13 Jun 2023 11:30 by MLMG.

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13 Jun 2023 11:30 - 13 Jun 2023 17:02 #885953 by daveo
Replied by daveo on topic Safe speed in a Kz.
At least I would know how fast we were going...  




1982 KZ1100-A2

Last edit: 13 Jun 2023 17:02 by daveo.

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13 Jun 2023 11:51 #885954 by BCScott
Replied by BCScott on topic Safe speed in a Kz.
I've done the 100-100-100 a couple of times lately. Not this year, though, as the weather was terrible. That's on the 100th day of the year, usually April 10th, with a bike and rider combined age of 100 years, a 100 mile ride, hitting 100 mph at least once and a bonus for finishing in less than 100 minutes. The stretch I use has a nice straight with excellent visibility and no cross roads. I like to count for speedo error, so will go to 175 kph or so. The bike is reasonably stable, but nowhere near as stable as a more modern bike. Mine still has it's shocks from 1977 and likes to wallow in high speed corners if there are any bumps, so I limit them to 120 kph or so.

Back in the saddle and loving it! KZ1000A1

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  • sf4t7
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13 Jun 2023 13:11 #885955 by sf4t7
Replied by sf4t7 on topic Safe speed in a Kz.
So there's the answer when told to lose weight -- staying heavier makes my motorcycle more stable!   
Seriously though, that was an interesting video

Scotty


Scotty

1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion

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  • hardrockminer
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13 Jun 2023 15:02 #885960 by hardrockminer
Replied by hardrockminer on topic Safe speed in a Kz.
The problem with the wobble is an energy input to the bike at exactly the frequency of the wobble.  It's a natural phenomenon that can be found in other structures around the world.  Engineers are trained to check for wobble potential in whatever they build. The problem with motorcycles is that there are too many variables to control.  Weight, the location of the rider on the bike, tires, fork springs and rear shocks...and speed.  All of these are factors that can cause a wobble.

There is a great video of the Tacoma Narrows Bridge (nicknamed Galloping Gertie) self destructing when the wind energy striking the bridge at exactly the right frequency caused it to collapse.

en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1940)

I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
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13 Jun 2023 15:13 #885962 by sf4t7
Replied by sf4t7 on topic Safe speed in a Kz.
A great video, I've always enjoyed seeing it.  It's an extreme example of learning from our mistakes.  Suspension bridge design changed as a result of that collapse.  Fortunately the lessons learned didn't involve casualties.

Scotty


Scotty

1974 Z1A
1015
welded Z1 crank
Andrews 1X Cams
Delkevic 4 into 1
Superbike bars
530 conversion

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