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Buell Forum » Big, Bad & Dirty (Buell XB12X Ulysses Adventure Board) » BB&D Archives » Archive through July 17, 2008 » Bottoming « Previous Next »

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Joenuclear
Posted on Monday, July 07, 2008 - 05:10 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My XT bottoms out on undulating pavement 2 up.

I'm about 230 and the pillion went about 130. Preload set to max.

Is there a forum sponsor that has heavier springs?
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Slowride
Posted on Monday, July 07, 2008 - 05:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Just noticed my X doing the same thing as we were coming back from a 900+ mile round trip this weekend.
The bike has/had 22k miles, 2 up , both bags loaded, 1 tent, 2 sleeping bags, my wife's very light 170ish and my fat 268 fat @ss!

I was thinking about asking the question myself. Ya beat me to it.
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Andrejs2112
Posted on Monday, July 07, 2008 - 06:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Mine has always done that. I'm not sure if it's the shock or something else. I'd be curious to see if anyone else has felt it. I'm not really sure how to describe the feeling. I could diet, but that would be too hard.
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Ft_bstrd
Posted on Monday, July 07, 2008 - 06:17 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Our suspension isn't really designed to be operated at 100%+ of maximum gross weight.

I have my suspension set to maximum, and I'm rarely anywhere near maximum gross.

I suggest you contact Al at American Sport Bike and see what heavier springs he has available. This will allow you to run with less preload and still maintain some shock travel.

I've rarely felt the front bottom. The rear doesn't bottom, but it doesn't have much give at maximum preload.
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Barker
Posted on Monday, July 07, 2008 - 06:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My rear on my 06 uly is too soft IMHO. Max Preload.

My rear on my niner is one notch away from max and it is stiff as a board. Great for aggressive riding.

200 lbs rider, both have stock boingers.
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Nevrenuf
Posted on Monday, July 07, 2008 - 07:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i've bottomed on the xt also and between me and the wife were looking at maybe 310 and its set at max. don't do it an awful lot but when you do, you can feel it.
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Hughlysses
Posted on Monday, July 07, 2008 - 07:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I found that I could eliminate it on my bike by increasing the compression and rebound damping. It's certainly easy enough to try- go maybe 1/2 turn above the factory recommended settings and see how that does.
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Ratbuell
Posted on Monday, July 07, 2008 - 09:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

+1 on adjusting the comp/rebound settings as well as the preload. All the settings are in the manual for bodyweight, remember? ; )
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Jphish
Posted on Monday, July 07, 2008 - 09:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I experienced similar symptoms on trip to Yellowknife on my '08 Uly with 4,000 mi . Excessive oscillating & bottoming on those freeze/thaw heaved roads - only me (@ 170#) & 40# of gear - Well below GVW. Suspension set for 230# by the book. As it turns out had a leaking rear shock, All the oil was busy coating the back of the bike instead of working on bounce control. Noticed preload adjustment knob had no resistance when I tried to crank it up. At least it's a warranty covered item. Check for oil - keep in mind the transmission vent tube is zip tied to the top of the shock - but you'll know the difference when you see it.
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Ft_bstrd
Posted on Monday, July 07, 2008 - 09:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Rat,

I have the compression and rebound settings set to manual for weight.
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Danger_dave
Posted on Monday, July 07, 2008 - 09:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

On the X's it also might also be that the shock just needs rebuilding.

Once the compression dampening fluid in an emulsion shock turns to paste over time it's all over rover.

Mine is about due.

Scroll down to the damping part

http://www.calsci.com/motorcycleinfo/Suspension.ht ml

(Message edited by danger_dave on July 07, 2008)
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Cityxslicker
Posted on Tuesday, July 08, 2008 - 05:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

get the bash plate from Tourtech and make sparks when you do it next time ; )
I bottom out so damn much you would think that I was mushing a sled.
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Buelldualsport
Posted on Tuesday, July 08, 2008 - 06:52 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yes, but your bike is short !!!!!!

Ride Em
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Rwven
Posted on Tuesday, July 08, 2008 - 06:57 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Is it bottoming out or is it coming up against the rubber compression stop? I have an XT and I haven't had it bottom yet, but riding with my wife on I drive gently.

You may need to ramp up the compression damping also?

(Message edited by rwven on July 08, 2008)
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Cityxslicker
Posted on Tuesday, July 08, 2008 - 07:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Oh now, it is a combination of bottoming out and throwing rocks up, damn short ground clearance. This is why I have a Touratech BashPlate


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Rclaytonsharp
Posted on Tuesday, July 08, 2008 - 07:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Danger Dave- thanks for the great link. It explains things pretty well but the XB rear shock is not an emulsion shock, it's a reservoir type like the one on the far right in the diagram. My instructor at BMW likened an emulsion shock to a butter-churn. It literally ariates the oil into a foamy mess.
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Rotorhead
Posted on Tuesday, July 08, 2008 - 10:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

An old trick to see if it really is bottoming out or not, place a small zip tie around the piston. Run the zip tie all the way up, increase the dampening all the way and go for a ride. When you think you bottomed out stop and look if the zip tie is bottomed on the rubber stopper.
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Danger_dave
Posted on Wednesday, July 09, 2008 - 07:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

>>XB rear shock is not an emulsion shock,<<

Cool - wasn't sure - they still get tired though, and the fluid loses viscosity.

Takes a lot longer to go off and rebuilding is heaps easier - if they are rebuildable.

Are the Showas - has anyone done one yet?
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Whitj
Posted on Saturday, April 09, 2011 - 02:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Has anyone rebuilt the rear shock yet? Can it be done... from home?

My shock oil is ready. I'm sure the spring is fine.
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