Handlebar wobble at speed

[b1k3rdude]

Even though I have devileyam R6 shock fitted I am getting a wobble from the handle bars while accelerating at high speed.

Is there a relatively simple way to reduce or better, cure this without going down the steering damper route..?

[b1k3rdude]

More info -

• Moving the handlebars from left to right - smooth, One finger from left to right with zero distortion.
  
• Tyres - I have a set of Pilot Road 2's on the bike since the summer, around about 2,000 miles done on them.
  
• Forks - completely rebuilt back in the summer.
  
• Weight - well I weigh about 93kg withpout gear, no topbox.
  
• I don't take my hands off the bars, but it does it hands on or off.
  

[Graham53]

Have you dropped the yokes down the forks or if so how much ? I got similar on my foxeye 600 when I fitted a jack up kit and dropped the yokes , I raised the forks back to normal and it cured it. Not sure if it is correct but I was told that dropping yokes quickens the steering but reduces high speed stability.

[b1k3rdude]

Forks have not been dropped through.

Pilot road 2's are good tyres but I wonder if they are part responsible for the wobble...

[red98]

Had the same wobble on maximum acceleration      turned out to be swing arm bearings.....hows your tyre pressures ?

[Graham53]

If yokes at normal height the only other things I could think of might be , wheel bearings , wheel balance and as previously said tyre pressures

[b1k3rdude]

Checked TP's and they were both below normal, corrected that and the wobble is mostly cured. I can still make it 'wibble' at speed or under acceleration, and I am fairly sure the swing arm bears are fine (there were last MOT and the bike hasnt done much miles since then.

[red98]

How many miles since last checking the pressures ?  Could be unusual tyre wear due to incorrect pressures....I would run it as it is for a couple of hundred miles until the tyres are wearing normally. .....strange things tyres

[ram]

are the balance weights still on? i lost one of mine once with a pressure washer

[b1k3rdude]

How many miles since last checking the pressures ?  Could be unusual tyre wear due to incorrect pressures....I would run it as it is for a couple of hundred miles until the tyres are wearing normally. .....strange things tyres

I normally check once a week, but forgot

None of the FZS1000's I have owned have never what I would call rock sold full stable at speed or under high speed acceleration, and this was confirmed when I bought a 1200 bandit. which is like a tank when it comes to high speed stability and wind protection when compared to the FZS.

[devilsyam]

try this ==under hard acceleration the rear is loaded hence the swinging arm bearing post which is a good line to follow mots look for excess play only small play is undetected till loaded

also try going up 1 click on preload this will make the rear harder and place load on the front

worth a go

[b1k3rdude]

• swinging arm bearing play is undetected till loaded
  
• also try going up 1 click on preload this will make the rear harder and place load on the front
  

• Good info, will get a new set of bearings and swap them out asap. Will 3rd party be good, or better to go genuine..?
  
• Will do, thanks for the tip fella. (@all, this info is relevant & usefull because I have one of DY's R6 shocks on the bike atm.)
  

[devilsyam]

i have used the ones from simply bearings of ebay but try the preload as its free to do before buying bearings

[b1k3rdude]

i have used the ones from simply bearings of ebay but try the preload as its free to do before buying bearings

Ta and will do.