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Post by summerking on Jul 7, 2008 19:30:49 GMT
hi
my d6 has quite bad vibration through the bars when rolling off the throttle, it smooths out under aceleration,its not coming from the head as i held a hand on it when it was vibrating,I,d read about fairing vibration but this is a real grinding rough vibe,and then sometimes when i ride off i don,t notice it at all?
many thanks
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Post by bobh on Jul 9, 2008 22:44:14 GMT
What sort of vibration is it? High frequency, engine speed type (tingling) or low frequency (juddering)?
If it's the latter it could be related to front forks or wheel, or possibly brakes, as it happens when the front end is being loaded. When was the fork oil last changed? Also check the steering head bearings and wheel bearings for play. Is the front tyre running true and does it have any lumps or bumps on the tread?
Bob
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Post by summerking on Jul 12, 2008 15:58:38 GMT
hi bobh
the front wheel is true and the tyres new,would a bearing problem be constant rough vibration ? as my problem is there maybe 50% of the time,when at other times it runs so smooth its almost like an electric bike,I,ve tried to replicate the conditions that instill the vibration but it comes and goes as it chooses,the fairing has a alot of vibration but the engine doesn,t and theres almost none from the forks
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Post by bobh on Jul 12, 2008 20:00:23 GMT
Don't you love intermittent problems?
It's pretty much impossible to do an accurate diagnosis of this sort of thing without actually seeing (or feeling or hearing) it happen.
Wheel bearings can fail in several different ways, and depending on that the symptoms will be different. It is not always possible to detect a failed bearing by checking for play. So, yes, it is possible that it would be a rough vibration. My theory was that a dodgy wheel bearing would show up more when the front end is loaded up, i.e. when decelerating, which is when you say it occurs.
If you suspect a bearing, the first thing to do would be to jack up the front end and spin the wheel - you will probably have to take off the calipers to get it to spin freely. Any roughness or tightness should be apparent by feel (e.g. on the spindle or forks) and / or noise as the wheel spins. Anyway, it's fairly easy and quick to do this check, so worth doing if only to eliminate it. Also a good opportunity to make sure everything around that area is torqued up properly.
Good luck - Bob
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