+1. From my experience this is true. It does depend on the individual engine and its operator, but in general I think big singles do better with a heavier oil. I do admit to being in favour of 15W-50/20W-50 oils for motorbikes in general for my country. 
        
 
         I realise that this way of thinking is probably bad for very cold climates, though.
         
         
         
        
 
         
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               Originally Posted by 
              UKbri  
              Mine had high oil consumption after 40,000 miles. I swapped to thicker oil (20/50) and it was much better. I think as the engine gets looser the oil just blows through. On 98,000 miles now with no engine problems.
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         Amazing. You legend. Still the same cam chain UKbri?