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Old 07-24-2009, 07:42 AM   #1
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Question Front end wobble??

After completely rebuilding my 06 gsxr600, due to my crash, the front end dosnt feel right. It's almost like if I had an adjustable steering damper it would be cranked all the way stiff, yet the bike leans side to side if I remove my hands from the clip ons- even in N. It's almost like riding on a set of horrible street tyres when I turn, but when I pull throttle it completely goes away and feels normal. BUT I do not want to be coming into a turn and roll off the throttle to find myself violently wobbling.

Now the forks have been off the bike and checked and seemed straight, as does the front wheel.


Yeah I sound like a noob but maybe somebody can help me out.


Looks like I'll be bringing the back up bike tomorrow just in case.




Thanks for the help
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Old 07-24-2009, 07:47 AM   #2
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Could be a bent fork, misaligned/bent triples, or something wrong (loose, trashed) with the steering head bearings.

The reason it feels ok on the gas is because you've transferred the weight to the rear wheel.
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Old 07-24-2009, 08:01 AM   #3
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Triples could be bent, to the naked eye they look good but who knows
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Old 07-24-2009, 08:11 AM   #4
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I have an extra triple Adam...if that is the case.
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Old 07-24-2009, 08:12 AM   #5
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Sounds like a mis-alignment or something is bent.

When you installed the forks back in the triple clamps, did you make sure they were exactly the right height? Did you have any issue putting the front axle through the front wheel's bearings?

What about the tires? Are they old take-offs that are over-worn on one side? Are they balanced?

Check, check, and triple check everything. Put the triple clamps on a straight edge or flat surface to see if they're tweaked. Use a run-out gauge to check the wheel, etc, etc, etc.

Oh yeah, don't forget the rear wheel- make sure everything there is straight and tight too!

How bad was the crash? Any chance of something worse being wrong like a frame issue?
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Old 07-24-2009, 08:28 AM   #6
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String exercise... tape the middle of a string to the back tire, run it forward and tape to the wall infront of the bike just as the string touches the front of the back tire lip. Set steering straight and measure the distance on all four corners of the front tire to see if its to the side, twisted etc. Depending on what you find, if both string track to the side, the rear tire is dogtracking the bike and needs to be adjusted straight; or the front forks are off a bit.

You can loosen the steering nut, and all the pinch bolts and tweak the triples/forks to straighten them out(by geometric design it can swivel.) Also check the castelated nuts on the upper tree to make sure there isn't any movement in the head bearing.
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Old 07-24-2009, 09:29 AM   #7
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or something wrong (loose, trashed) with the steering head bearings.
I was gonna say this!!
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Old 07-24-2009, 09:37 AM   #8
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Quote:
Originally Posted by tomLSTD View Post
Sounds like a mis-alignment or something is bent.

When you installed the forks back in the triple clamps, did you make sure they were exactly the right height? Did you have any issue putting the front axle through the front wheel's bearings?

What about the tires? Are they old take-offs that are over-worn on one side? Are they balanced?

Check, check, and triple check everything. Put the triple clamps on a straight edge or flat surface to see if they're tweaked. Use a run-out gauge to check the wheel, etc, etc, etc.

Oh yeah, don't forget the rear wheel- make sure everything there is straight and tight too!

How bad was the crash? Any chance of something worse being wrong like a frame issue?
It was a very bad fast crash. The tyres are in decent shape and worn even. I'm gunna mess with the forks tonight to recheck


Thanks alot
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Old 07-24-2009, 10:32 AM   #9
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Quote:
Originally Posted by Hooligan View Post
It was a very bad fast crash. The tyres are in decent shape and worn even. I'm gunna mess with the forks tonight to recheck


Thanks alot
Hmmm, may want to get in touch with someone who can measure the bike out for you. The other thing is that there could be loose bolts/ nuts/ etc from reassembly which could cause your issues (not sure what all you built/ rebuilt on it).

I'd take it to a pro before taking it to the track if it was that bad of a crash.
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Old 07-24-2009, 07:16 PM   #10
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how are you supporting the bike while you remove the forks? If possible, pull back and forth on the forks legs to check the forks and steering head for issues. Did you remove the triple tree? Did you repack the bearings? Did you torque the bottom nut to spec and then back it off and re-torque? This is key when putting the triple back in. If you get a chance, you should pick up some tapered head bearings. I put some new ones in my r1 the other day. They feel much better and are much more resistant to hard landings.

http://www.goallballs.com/SHOP/shope...rom=Ret&id=574
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Old 07-24-2009, 09:04 PM   #11
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other thing is check for vertical alignment; make sure front and rear wheels are parallel in the vertical plane.
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Old 07-24-2009, 11:17 PM   #12
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Old 07-25-2009, 12:18 AM   #13
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check your wheel weights on my zzr the front weight flew off and gave me terrible wobble when i decelled never hurts to check
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Old 07-25-2009, 12:31 AM   #14
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Old 07-25-2009, 12:46 AM   #15
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Old 07-25-2009, 12:51 AM   #16
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gsxr's are known to do this after front end impacts, the neck of you frame could be bent a little and cannot be noticed. Also check your neck bearings.
My 600RR was doing the same thing but it was because i needed new fork seals.
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Old 07-27-2009, 08:17 AM   #17
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OK so I might need new triples. I'm going to loosen my screws and "hit the front tire on a tree" (lol thanks T) and see if I can straighten it out.


Oh and anybody got a gsxr600 ratiator for sale cheap??
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Old 07-27-2009, 08:49 AM   #18
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OK so I might need new triples. I'm going to loosen my screws and "hit the front tire on a tree" (lol thanks T) and see if I can straighten it out.


Oh and anybody got a gsxr600 ratiator for sale cheap??
Did you ride it at the track Saturday?

Personally I think you're on target with the bent pieces.
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Old 07-27-2009, 10:00 AM   #19
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Ah yes, a man with a sense of history. They dont make music like that anymore. sad.
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Old 07-27-2009, 10:07 AM   #20
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Did you ride it at the track Saturday?

Personally I think you're on target with the bent pieces.
I did instruct with it Level 2 for a few sessions before the bike caught fire.... LOL nah, just overheated

My triceps are sore from trying to hold that bucking bronco upright, at speed it felt stable- but if I was not on the throttle or the brake it was a bit wobbly and def needs to be fixed asap.


Conclusion of thread: New triples.
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