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24 Aug 2010
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Boing boing: fork springs?
The progressive fixing of long-term niggles in my XT continues ...
Next up, I get an annoying 'boing boing' feeling through the front wheel as I ride along at 100+ kph. It feels like the front wheel is oval, but its not (checked spinning both rim and tyre against a reference indicator). Head bearings are good (new'ish) and tight. I replaced the fork oil, checked fork air pressure, tyre pressure. I have a little super-moto style front mudguard, so that's not wobbling in the wind.
The only thing possible left (it seems to me) is that the fork springs have got too tired and can't control the forks properly any more. They are a *tiny* bit shorter than their service limit figure in the manual.
Anyone else had this problem and fixed it, before I splodge 100 Euros on new springs from Kedo?
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24 Aug 2010
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They're cheaper on ebay
Have never seen or heard about fork springs of the limits.
But the bike deserves it, so consider it anyway.
The handlebar, or the mounts for the handlebar, is rubbermounted. I've heard people say the bike feels weird when they are worn. Could be that.
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24 Aug 2010
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Wheel well out of balance?
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Anything can happen in the next half hour
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24 Aug 2010
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hi there i would agree the wheel sounds to be out of balance , have you fitted a new tyre resently and has the problem apeared with the tyre. zigzag
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25 Aug 2010
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It felt the same on the last set of tyres (Michelin Desert) as well as the new Siracs that are on there now. Its true there aren't any balancing weights on the wheel, though. I'll pull it off and check the balance.
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25 Aug 2010
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This is not a spring issue. An out of balance wheel would have a much higher frequency at the speeds you indicate. Firstly I would look at the teflon ring on your damper rod and the inner surface of the stanchion for wear. In fact just replace the ring regardless. Next step would be to increace the fork spring oil wt to the next level. i.e. if the bike has 10wt oil in, try 15 wt. This will increace the damping properties.
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29 Aug 2010
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Finally
The slide oil seals I spoke of
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30 Aug 2010
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Great, thanks Bruken. Now I've just gotta hunt around to find a Yamaha dealer with a microfiche for my bike, and get the parts. Watch this space ...
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