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EFI Sportster Motorcycle Talk (2007 and up) For 2007 and above Sportsters

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  #11  
Old 2nd April 2020
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Toejam503 Toejam503 is offline
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Sportster/Buell Model: XL 1200 C
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Had the wobble problem with mine last year after replacing the tires. I don't remember if it was doing the 40mph wobble before I replaced the fork oil or not. I put in the required amount of fork oil and measured it, then the wobble developed. I checked everything, torque on the stem, the triple trees, tested the tire for run out. finally I leveled up the bike pulled the fork caps and found that one fork level was about 3/4" lower than the other. Evened them out and NO MORE WOBBLE! Yeeaaa!!
I figured that maybe one fork didn't get all the fluid drained like the other. Once I started riding it all the air was expelled from the orifices and the level changed causing unequal fluid levels. Live and learn. This is what fixed mine..
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  #12  
Old 6th April 2020
201648Rider 201648Rider is offline
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Had this problem start on my 2016 48 about 6 months in.
If you completely let go of the bars it used to be terrifying, but if you barely touched them it was fine.

New front bearings, brake rotor (warped), and rebalance fixed my issue and it hasn't come back since.
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  #13  
Old 6th April 2020
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Replaced the rear tire. Check the last thing.....Could the rear tire/wheel be out of alignment?
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  #14  
Old 6th April 2020
koolbreeze koolbreeze is offline
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All of the above. Balance is first and foremost as you have changed the tires. If spoked wheels check for loose spokes and rim run out. The move on to rake & trail if you have changed any suspension settings, changed front fork length or replaced rear shocks. Did you replace the tires with OEM sized tires or change the size of the tires.

Lastly check rake & trail, along with alignment.

https://www.motoshark.com/motorcycle-rake-trail-offset/
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  #15  
Old 4 Weeks Ago
CragerXLH CragerXLH is offline
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Many interesting replies! So many that I joined the site today
There's just too much great info here to get it for free.
I am thinking the resonance thing sounds about right.
I don't know how much the previous owner weighed.
I have turned the rear shocks up a couple of notches.
I'll try turning them back down and see what happens.
Thanks to all for your input!
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  #16  
Old 4 Weeks Ago
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Quote:
Originally Posted by CragerXLH View Post
Many interesting replies! So many that I joined the site today
There's just too much great info here to get it for free.
I am thinking the resonance thing sounds about right.
I don't know how much the previous owner weighed.
I have turned the rear shocks up a couple of notches.
I'll try turning them back down and see what happens.
Thanks to all for your input!
Yes. I have found that lowering the rear some while keeping the front at full height moves the resonance point, and makes the bike feel more stable. Both of my sportsters are set up that way now.
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