Weave and Wobble and and XS110

[Rickrider]

A link to this video was posted on another forum in a discussion about weave and wobble. Any racing fans, especially F1 of an earlier era will recognize Murray Walker and what appears to be an XS 11.

http://www.youtube.com/watch?feature=player_detailpage&v=fvsDIq3WwVA

[jjz28]

Hope that never happens to me! I am not light at all so hopefully that will help. I wonder how many stones I am?

[Crusty Snippets]

Stones and things

A few thoughts.
14 pounds to the stone, John was 10 1/2 so 147, the other guy was 11 1/2 so 161.
Early motocross four strokes were BSA Victors. They handled bloody awful. Hit a bump, break your thumbs. Geoff Smith road them. I met him when he worked for CanAm.
I noticed with 50% of the video done, there was 50% to go. Murray Joke.
Murray"s dad was a good rider.
There were holes in the bottom of Murray's visor, likely to stop it fogging.
The Suzuki was a water buffalo.
I have never seen any bike wobble and weave like that. Phooie to the riders weight. Tell that to Jim Dunn, Steve Baker and Valentino Rossi.
Rossi stands on the pegs with both hands in the air.
Murray worked in an add agency that had the Dunlop contract.
The old Dunlop TT100 were good tyres.
He never said anything about the back wheel correctly following the front.
Everything I road went straight except for a CanAm that I used an 18 inch front wheel on, instead of the 21 inch. That was to get a street tyre for the track. It wandered at about 90mph.
I had one tank slapper type wobble at the Seattle track, when the back wheel slid out at around 80mph.
My Suzuki goes dead straight at speeds faster than Yami can go, Same goes for my old 68 Norton, that went as fast as any Norton ever did.
Murray's biography is a good book to read.
Unkle Crusty

[motoman]

A few thoughts.
14 pounds to the stone, John was 10 1/2 so 147, the other guy was 11 1/2 so 161.
Early motocross four strokes were BSA Victors. They handled bloody awful. Hit a bump, break your thumbs. Geoff Smith road them. I met him when he worked for CanAm.
I noticed with 50% of the video done, there was 50% to go. Murray Joke.
Murray"s dad was a good rider.
There were holes in the bottom of Murray's visor, likely to stop it fogging.
The Suzuki was a water buffalo.
I have never seen any bike wobble and weave like that. Phooie to the riders weight. Tell that to Jim Dunn, Steve Baker and Valentino Rossi.
Rossi stands on the pegs with both hands in the air.
Murray worked in an add agency that had the Dunlop contract.
The old Dunlop TT100 were good tyres.
He never said anything about the back wheel correctly following the front.
Everything I road went straight except for a CanAm that I used an 18 inch front wheel on, instead of the 21 inch. That was to get a street tyre for the track. It wandered at about 90mph.
I had one tank slapper type wobble at the Seattle track, when the back wheel slid out at around 80mph.
My Suzuki goes dead straight at speeds faster than Yami can go, Same goes for my old 68 Norton, that went as fast as any Norton ever did.
Murray's biography is a good book to read.
Unkle Crusty

Exactly right, none of those bikes shown would do that, not without rider input. That oughta' tell ya what I think of the video.........pre-staged. Any bike in decent frame/suspension condition WANTS to track straight and stay upright while rolling. Surprised he didn't try to promote/sell Dunlop tires at some point in the video. BTW, the Beeser 650 wasn't bad when hung in a Richman frame. As for moto-x, ever remember Adolf Weils or Beng Abrerg?(spelling sucks).....saw both of them and some other famous Euro mot.xer's at the first American Inter-Am held in the U.S. of all places, Cherry Creek, east of Denver,Colo. Sept. 1970. Also, all those scoots shown in the moto-x videos were 1980's vintage.

[Rasputin]

Guess I have to ask if you are ever involved in a high speed wobble would you try the method he says or would you try to ride it out? On the other hand how would laying down on the tank do you any good with a wind jammer attached?

[motoman]

Guess I have to ask if you are ever involved in a high speed wobble would you try the method he says or would you try to ride it out? On the other hand how would laying down on the tank do you any good with a wind jammer attached?

Can't say I ever had a high-speed wobble. Had ahigh-speed weave on the ST once when hit by a rouge cross-wind at a GPS'ed 134mph on the Interstate. I'm sure the large Givi tail trunk attributed to that. Just had to back out of it till it straightened out at 115mph. Even though the bike easily pushes thru that 130mph 'wall', I avoid the tripple digits cept for the occassional quick burst. No 'performance awards' for 25+yrs. and prefer to keep it that way.

[DGXSER]

Hey Ras, the windjammer attached may be enough to stop it ever happening, as it changes the weight distribution. But, even if it did occur, laying down would still help as it is more about weight distribution between the wheels than aerodynamics.

[BA80]

I have experienced that but not that violently. The only time I've had it happen was in a sweeping curve.

That was when I had the bar mounted windshield, I've only felt it very slightly and only a couple times since I've been riding with a fairing and that was at speeds above 90.

[jetmechmarty]

I have seen that happen. I saw it on the interstate at high speed on an XS1100 standard. I don't remember who's bike it was. There was a load on the luggage rack. The load was moved forward to the pillion and the problem went away.

[Rasputin]

Hey Ras, the windjammer attached may be enough to stop it ever happening, as it changes the weight distribution. But, even if it did occur, laying down would still help as it is more about weight distribution between the wheels than aerodynamics.

I have experienced it once with the Jammer on and it was only a slight wobble. I was racing two other XS11's at the time though and we were over 120 MPH. I did not know about the weight distribution, so I could not attest as to whether it works or not. It does make the back hole close up so the putty does not escape though, I will attest to that.
You bring up an excellent point, as the laying down may have changed the weight distribution enough to stop it. I did win by the way and they both asked me to set their bikes up to run that fast. I told them that as long as I was their mechanic, they would never be able to beat me.

[CaptonZap]

I don't know how many of you saw the movie The Worlds Fastest Indian, but in one of the scenes Burt figured out that the weight of the fairing behind the bikes center of gravity was causing his high speed wobble, so he loaded the front with lead. Same principle, maybe.

CZ

[motoman]

I don't know how many of you saw the movie The Worlds Fastest Indian, but in one of the scenes Burt figured out that the weight of the fairing behind the bikes center of gravity was causing his high speed wobble, so he loaded the front with lead. Same principle, maybe.

CZ

True CZ. I learned decades back when I first owned my Venturer that the bike stayed stable in heavy, gusting crosswinds by putting feet out on the road pegs creating a bit more load on front of bike, something I knew about, but definitely convinced me after trying it. Any method of putting a bit more weight on front of a scoot stabilizes the front-end at highway speeds. The LaminarLip on the shield of my ST creates a slight added downward air pressure on front of bike enough that when at the rear corner of an 18wheeler there is no bobble whatsoever and smooth as runnin' in 'clean' air. That right there tells me there's definitely an effect from the added down pressure on front of a bike. As a sidenote, don't think I'll be putting lead bars in the fairing compartments of the Venturer though.

[ViperRon]

Been there at high speed I have full farring and bags letting off throttle hard made it worse was after hitting a rise in the road. Rear tire was well worn front tire new probably the cause had to gradually slow down nearly turned to a tank slapper. Leaning forward with power on pulled it out of wobble.

[Crusty Snippets]

Rickman

BTW, the Beeser 650 wasn't bad when hung in a Richman frame. As for moto-x, ever remember Adolf Weils or Beng Abrerg?(spelling sucks).....saw both of them and some other famous Euro mot.xer's at the first American Inter-Am held in the U.S. of all places, Cherry Creek, east of Denver,Colo. Sept. 1970. Also, all those scoots shown in the moto-x videos were 1980's vintage.

Met a bunch of the early euro motocross riders in Hawaii in 68 where it was popular.
Bought a new 71 Norton Commando ( piece of junk ) should have bought a Rickman frame but they only had Royal Enfield motors in them.
Followed guy over several sets of railway tracks at an angle going to the Liverpool docks. He on a Rickman, me on the Commando.
He was nice and smooth, I was like a pregnant cow in quicksand ( Mike Hailwood quote ) Damn near lost that wobble machine right there.
Did buy a Rickman frame tho for another guy.
My worlds fastest Norton had a Reynolds frame that was very similar.
My 125 dirt bike had a Rickmans frame and it was a sweetheart.

Unkle Crusty