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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through April 07, 2010 » 09 CR High Speed Front End Shake « Previous Next »

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Tommy_k
Posted on Saturday, April 03, 2010 - 01:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hi guys, Here's the skinny. From new, the bike seemed to handle fine and be stable. At 250 miles bike went down, low speed lowside from truck stopping for a turtle. Anyway, spent some time at the dealer being fixed. Mostly cosmetic. Rear sprocket was replaced as it was in contact with the swingarm. They determined that the swingarm was NOT bent. Suppossedly everything else checked out. Picked it up, rode it home. Week later, riding it back for recall and flash update. On a closed course, I started winding it out a bit. First around 115, and then really badly at 120ish, the front end began wobbling. Didnt feel tank-slapperish, just like front end was loose or something. Had dealer check a few things and tire pressures were good, steering neck was in between spec...3lbs, book says from 1 to 7 I think. Also had them remove wheel/tire to check balance, which they said was good.

After riding it back, it's still there. Of course they can't duplicate because of speed. Looking for ideas. Possible bent front end or something? I don't remember it being like this prior to accident. I've seen 140ish on this particular bike and I remember it being stable. I mean, a stabilizer will always help some, but this is a night/day difference.

Help! Thanks BWB!!
Tom
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99buellx1
Posted on Saturday, April 03, 2010 - 01:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Forks aren't just simply twisted are they?
It's simple to just loosen the lower tripple and re-torque.
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Ratbuell
Posted on Sunday, April 04, 2010 - 08:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'd go tighter on the steering head. 3lb is in the bottom half of the spec; if you're running it hard on closed course, go to the tighter end of the spec.
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Boogiman1981
Posted on Sunday, April 04, 2010 - 09:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

did they futz with the rear spring settings? it maybe softer now than before
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Geforce
Posted on Sunday, April 04, 2010 - 09:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I like to look at the little things first too. This is in no way an insult to your skill or rider level but how much pressure do you have resting your hands on the grips? The reason I ask is because these bikes are easy to get a little shake with if your hands are locked on those grips.

EDIT - Revised suggested plan of action.

It's easy to try it again and make a mental note to relax on the grips from your shoulders down to your knuckles and see if it goes away.

My next step would be to re-adjust the suspension settings accordinging to the book and then make any minor adjustments as you ride it more.

Then...if all else fails, begin to look at the forks/steering head/etc.

EDIT, revised suggested plan of action.

(Message edited by GeForce on April 04, 2010)
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Jsg4dfan
Posted on Sunday, April 04, 2010 - 01:55 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I had my CR do the same thing a couple of times while at a track day (gets your attention @110+!). I concentrated on relaxing my grip on the bars and it never came back. I thought I was relaxed, but I wasn't -- for me, on that day, it was surprising how little force it took to create the shake.
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