Tire "in and out wobble" in 1st on Paddock Stand.

xlr8tion

Turbocharged
Joined
Jan 13, 2016
Messages
509
Location
Aiken, South Carolina
Ride
2016 BMW S1000XR
Quick question for the gang.

Just installed Flips Paddock Stand on my 2007 R3C-Great Product!

Now that the rear tire is off the ground I noticed that the new(300 miles) rear EBCs are still grabbing quite a bit....Can turn the tire but it takes some effort.

SO.....Just for kicks I started the bike and, in idle, put her in 1st gear to see how much noise the dragging would make. To my amazement the Bstone Exedra Max was oscillating "in and out" but not left and right and the drive shaft would make an intermittent clunking so I shut it down immediately.


Two questions...

1. Can I idle the bike in 1st gear without damaging the diff. driveshaft or engine or is this dangerous as the tire is "unloaded"

2. During the 10 to 15 seconds that I did this what would make the tire actually oscillate in and out(as if were out of round) but not do so left and right.

I only did this for 15 seconds as I did not want to damage the bike.

If this oscillation and intermittent shaft clunking is not due to me idling the bike on the work stand please LMK what you think it may be.

Thanks....Greg
 
Take a screw drive and pry the brake pads away from the rotor and then see how free she spins by hand and try so see if there is any slop in here then we can go from there. If its moving in and out a bunch with the pads loose I would wonder if someone had the differential off and forgot the steel bushing that goes in it. Unless it sound and feels like your turning a bucket of gravel ie. bad bearings. She is up so easy enough to yank her off and check.
 
Jeff Cameron said:
1)Is the tire fully seated on the rim?
2)Is there excessive play in the rear wheel bearings?
Click to expand...
1. Yes
2. Don't know how to ascertain that.....when the bike is in idle in first gear on flips stand with the tire rotating how ever many rpms/min it would in first gear-the tire appears to be moving in and out a 1/4 to half inch....this is a not a left to right wobble....it is an in an out wobble. This is hard to perceive when the tire is rotating several hundred rpm per minute but it is enough to slightly vibrate the bike when you rest you hand on the back rest.

More importantly...is it safe to run (for the diff and engine) the bike at idle in 1st gear with the tire spinning at several hundred rpm....I have the front fork secured down so the tire wont hit the ground and launch the bike

PS...Is there any way to attach a mp4 file or how do you load a vid file on the site?

Thanks!
 



If its moving in and out a bunch with the pads loose


Warp.....

I have little working knowledge of anomalies like this....The bike rode NORMAL for 300 miles at high speed this week I am just don't know what you mean "moving in and out a bunch."

If it were moving back and forth would not the front of the rear tire hit the inside of the fender? The clearance appears to be 1/4".

When riding her the transmission sounds smooth just the occasional slight clunking when shifting gears.

But what worries me is that when I am running her at idle on flips stand in first gear the tire precesses enough to shake the bike slightly and there is intermittent slight thumping of the shaft where it enters the rear of the engine.

I will try to post a you tube vid.

If it were that fubar'd I do not think I would be able to have run at over 100 mph multiple times without any butt feel of an issue and the shaft drive sounds smooth at speed but there is alot of wind noise wearing a full face. What happens to your rear tire if you run it in 1st on a paddock stand at idle?

Is this even safe to do with the rear tire unloaded? I have the bike strapped down so its not going to launch-just do not want to blow the diff or the bearing at the shaft/engine interface.

Bike rides fine...just noticed this on the Paddock Stand

Will post youtube vid of 10 seconds duration...Perhaps you can see it?
 



Watch this carefully...I will shoot a longer one to catch the shaft drive clanks....

 
Do you mean side to side slop. Like if you sat down on the side of the bike facing the rotor grabbed the rotor and pushed it in and out like into the differential and back out towards the brake caliper. or are we talking rotational slop? (much like backlash in a gear)

Oh and take a look to make sure there is a aluminum bushing/spacer between the frame and the wheel on the brake side.
 


Rotational slop...Warp....I know the video was short but did you see that 1/4" movement when watching the rear of the tire? Did you see anything out of the ordinary in that 10 second clip? There is one shaft clank about 3 seconds in......?

Heres that pic.....
 
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