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               Originally Posted by 
               Pleiades 
                
               
             
              Bad luck - that really is a bit of pain in the ar5e Phil. 
                
               
               It has happened before and seems to be attributed to riding for any significant length of time with the swing-arm past horizontal (the rear axle above the output shaft and front sprocket). More often than not it is due to either one, or a combination of: saggy OE Sachs shock, 
               fitting lowering links or being heavily loaded for extended periods.
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         Standard links are 126mm. Fitting lowering links will do exactly what you suggest.
         
        
 I've fitted adjustable raising links to mine and run them at a mediocre +15mm. I didn't do this to raise the rear as such, but to keep everything in line better when loaded up.
         
         
        
http://www.projection-components.co.uk/quad-length-jack-up-links-select-model-18-p.asp