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               Originally Posted by 
              Simon  
              I'd put money on front wheel bearings from what your saying.
              
 There is a method using a trolley jack or similar under the engine and then lifting the front that way.
 
 If your unable to check the front yourself I'd suggest taking the bike to a mechanic.
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         Is this quite a serious thing? Should I immediately stop using the bike until I can get it repaired? It has been a while since I first heard the noise...