OzSTOC
Honda ST1100 Section => Honda ST1100 General Questions => Topic started by: Kev Murphy on July 11, 2015, 07:56:41 PM
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A new vibration. Comes in above 75k, shimmy is worst at about 90k. Unsettling, as I have to ease off before it becomes a tankslapper.
Happened after a hidden pothole impact. Forks undamaged and true.
Front wheel balance tested, and it's not that. Any other ideas? :think1
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I need a fast fix for this one, as it's only a week away from RTE in SA
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Hmmm......it does sound like tyre damage, but you have checked balance :think1
Happened to me on my 1100 a few years ago......had a wheel weight on the rim that I didn't know was there in the first place.....but I could see where it was and replaced, fixed the issue ;-*
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Front tyre is only about 50% usage... had a dynamic balance test this afternoon, where the wheel is spun up to speed as well
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Front tyre is only about 50% usage
A big hit could have damaged the cords :think1
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Will remove tyre on monday, and check it internally for damage.
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It does sound like wheel balance. :think1
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close-up visual internal inspection may tell me more, but it's odd that it passed a dynamic wheel balance, where the wheel was run up to 130 KPH and showed no problems? 20 minutes later on the road, and the wobble was still there.
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Did they check the wheel itself for any out of true or a slight flattening or the rim slightly out? Might be worth looking at the bearings as well . .
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yep, Stroppy, rim is true and no malformation. Bearings were pulled and checked as well.
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I wonder if one of the fork shocks valving may be slightly different to the other as a result of the hit?
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I would start checking the front shocks.
My old CB750 ran for years without any problems and then one day the handle bars started to wobble at low speed and gradually got worse at higher speed.
It wasn't until I took the front end apart that I noticed that one shock was softer than the other and when you compressed the shock, it didn't compress smoothly. No obvious seal leaks.
Took both forks to the doctor and the internals of the shock were inspected and new oil added. Problem fixed.
Just a thought.
Good luck
Just a thought
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Now that's logical, will have them checked on Monday... Thanks to all for the advice!
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All becomes clearer after strip down of front end today.
Stroppy and Hoffy were on the money.
Left front fork has internal injuries, very little damping effect, its more like a pogo stick.
Also bottom head stem bearing cage has collapsed, and bearings are all to one side so the steering geometry is a bit kakky skewfonkered. Unsure if parts will arrive before the weekend, but can't book it into the bike shop until next Monday. Looks like I have to reluctantly cancel run to Swan Reach RTE next Saturday.
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NOT very keen on this enforced walking caper during this lousy wet weather but on the high side, all parts required have arrived at bike shop and ready for installation Monday.
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I wonder if that is why my beast is constantly wanting to go left.
I changed the tyres the other month but when I take my hands of the bars the beasties not so slowly veers to the left.
Hmmmm ..... what to do and who to see about that I wonder.
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I wonder if that is why my beast is constantly wanting to go left.
I changed the tyres the other month but when I take my hands of the bars the beasties not so slowly veers to the left.
Hmmmm ..... what to do and who to see about that I wonder.
First thing I would check would be that the fork staunchens were located identically in the triple clamps . . If they are marginally different, it could result in veering to one side or the other . .
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The description is harmonic. Either bearings or wheel not aligned. There is a method for aligning the front wheel with the right pinch bolts I think. Will need to look at manual or STOC have an article I am sure
Cheers :grin :wht11
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If the axle bolts were tensioned following the incorrect procedure can cause this problem. Have had it happen to me after having tyres fitted to a NT700v problem was that the tyre fitter missed the step where you bounce the forks three times to settle everything into position.
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Bike is back on the road as of 6 pm tonight. Rebuilt front forks, seals, o rings etc. Visual inspection of tyre shows no abnormalities, inside or out. Head stem bearings replaced, and it now behaves on the road, no shimmy.
(all I have to do now, is budget to pay for it all, lol) :thumb :grin