hi speed weaving

[Skid06]

just got back from nw200, on the motorway my 08 gsa at about 90mph starts to go very light on the front end if you take the speed up to about 110mph it starts to weave and becomes unstable, any ideas where to start?, my brother who has the same bike and was on the trip let me ride his and it was no problem on the same settings on the esa

 

[Mr K]

Tyre type/wear/pressures, weight of rider, weight of stuff in top box, panniers fitted or not.

So many variables.

 

[Schtum]

Following on from Mr K. How much stuff did you have on the bike and how did you have the ESA set?

 

[Skid06]

same weight rider 16st and esa setup, panniers and top box, my pressures 2.2f 2.5r brothers 1.9f 2.2r

 

[Schtum]

Yes but what did you have the ESA set at? Also, if you were fully laden, I'd suggest that your tyre pressures are far too soft. 2.5 / 2.9 (if we must do bar. rather than PSI) would be more like it.

 

[Skid06]

i tried everything on the esa was better on sport 2 up but far from perfect and my brothers
on the same setting with lower pressures than mine his was rock steady to 130mph a speed i would consider unsafe on mine suicidal in fact!

 

[Kintessack GSr]

Yes but what did you have the ESA set at? Also, if you were fully laden, I'd suggest that your tyre pressures are far too soft. 2.5 / 2.9 (if we must do bar. rather than PSI) would be more like it.

+1

Do you both run the same tyres? Is the wear the same? How much weight in panniers?

 

[Schtum]

I'm just back from a week-long tour of Orkney and Shetland with my son. We both have '09 GSes with ESA; his was on Tourance EXP and mine on original Tourances. We both weighed the laden bikes + rider on the weighbridge at a ferry terminal and we came in at an identical 380 kg.

Tyre pressures were 36 / 42 = 2.5 / 2.9 front and rear and on twisty bumpy roads we ran 2 up Normal on the ESA with 2 up Sport on smooth roads, except in the rain deluge on the way home, yesterday afternoon when we both ran 2 up Normal. Neither or us experienced any weaving even up to 90 mph in pouring rain and very blustery conditions. Having said that, neither of us have topboxes....

 

[Edventure]

Top boxes never help stability. I experienced a fair bit of weaving on my 2010 GSA on tourances. Got better with Trail Attacks and pretty much cured with Wilbers ESA shocks. Expensive remedy!

I would start with tyre pressures............

 

[Skid06]

both on nearly new tourances, both bikes are exactly the same with top boxes thanks for your efforts guys, what i did noticed when i checked over the bike is that the rear wheel is a few mm out of true..but guess what, so's my bros so it cant be that..i also noticed when i rode his an he said the same that his felt smaller in ride height could it be the forks?

 

[mherkin]

Murray Walker's Take on Weaving

They played this on our Bikesafe course yesterday:

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

Interesting take on how to stop weaving along with the insights into why the Pan Europeans were ditched by the polis. The guys in the video are serious headcases. Balls of Steel.

 

[Skid06]

thats hilarious! good old murray, im so not worried after seeing that, we where well over the legal limit 100-120mph with all that weight on board so i think i was expecting a bit much from a bike with the aerodynamics of a wall brick and thats without the box and panniers, thanks rico

 

[DrFarkoff]

Not much chance of many folks here having that problem of weave

Last time any of us saw 10 and a half stone was the same year as this was made! LOL