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'Whirring' off idle as accelerating....

helmetbox said:
The sound is like the brakes grinding on the disc, or some like diesel vehicle having a faulty belt.

I think I know what you meant. My bike has that sound too. Will get then to check when I'm going for my 10k servicing.
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Just got mine back from service with the whir
New chain tensioner put in I am going to assume that is what is making the whirring sound
It wasnt there before servicing and my tensioner was out of spec
 
Ray said:
Just got mine back from service with the whir
New chain tensioner put in I am going to assume that is what is making the whirring sound
It wasnt there before servicing and my tensioner was out of spec
Click to expand...

Hmm... I'm going for my 10k km servicing soon. Doubt the will look into the tensioner.
 
For what it's worth, I had what I thought was the same sound right at about 10mph and only on acceleration. Rode the bike to my original dealer about an hour away and by the time I got there it had healed itself. The BMW tech at that shop told me there is a chip in the machine that tells the bike when to go back to functioning perfectly...whenever a BMW tech is trying to find the problem.
 
Easier said than done..... I had whole belt / pulley side changed but just as bad us that squeak has joined the party....CW having Scoot 2 back soon.... Stay tuned...... On the upside it didn't get any worse being spanned over the mountain 4 times!


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Well as soon as I heard the noise it has refused to return.........
Did about 25 Miles tonight and not a Wimper.
Makes me wonder if it was Clutch Squeal???
The Burgman 400 is prone to clutch noises when Dust builds up???

Andy
 
Normsthename said:
Well as soon as I heard the noise it has refused to return.........
Did about 25 Miles tonight and not a Wimper.
Makes me wonder if it was Clutch Squeal???
The Burgman 400 is prone to clutch noises when Dust builds up???
Click to expand...

Hey Andy,

Yeah, mine cannot be reproduced consistently. But it is there more often than not. I don't know what "clutch squeel" is but when I do hear the house it is down in the lower right area at the rear wheel. Described by others as a seal bark kinda sound.

I thought it might have something to do with the chain tensioner thing we are discussing on another thread.

Yellasei, what do you think?
 
SteveADV said:
Hey Andy,

Yeah, mine cannot be reproduced consistently. But it is there more often than not. I don't know what "clutch squeel" is but when I do hear the house it is down in the lower right area at the rear wheel. Described by others as a seal bark kinda sound.

I thought it might have something to do with the chain tensioner thing we are discussing on another thread.

Yellasei, what do you think?
Click to expand...
I havnt heard the noise yet, i know mine makes a noise from the drive chain on the slippers it runs on.
You guys seem pretty confident that your noises are coming from the right hand side so something variator related.
All i can think is that i once owned a piaggio 125typhoon and a mate had an aprillia sr125 and from pullaway, sometimes they screatched, a bit like a turbo dump valve kinda noise. This is the only thing i can think without hearing it. That noise we put down to the belt skidding against the variator, causing the ramps, or possibly the bell at the back to ring.
 
One thing about flying Helicopters for many years, I have found clutches can make strange sounds and vibrations.

I have noted on my 650 at about 15 mph the clutch engages but will continue to slip a clutch shoe up to 20 mph. To eliminate this I simply let off some of the pressure of the throttle like only 5 degrees of turn and the clutch will engage all of the shoes. This is something we learned to prevent glazing and per-mature clutch wear.

All the shoes are retracted by spring tension and engaged by centrifugal force. If you have any difference in tension or some glazing or dirt it could make the difference at which RPM each of the clutch shoes engage. By backing off the torque on the clutch it allows the shoe to engage and not continue to slip. You can feel the clutch fully engage.
 
Dale said:
........All the shoes are retracted by spring tension and engaged by centrifugal force. If you have any difference in tension or some glazing or dirt it could make the difference at which RPM each of the clutch shoes engage. By backing off the torque on the clutch it allows the shoe to engage and not continue to slip. You can feel the clutch fully engage.
Click to expand...

Everyone knows that :D.


I barely know where to put the gas.
 
I have also found that the clutch dust will make the clutch slip a bit and as you ride for a while it gets dispersed and the slip will disappear or be a lot less, other bikes I have had with cvt transmissions
By blowing out the clutch compartment with compressed air made a big difference until you have accumulated more dust and than you have to go through cleaning it out again.
 
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