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               Originally Posted by 
              Pleiades  
              Sorry, just to clarify, yes this is the correct bearing, watch out for the 'X/26' has a 26mm ID, not 25mm - you need the 25mm 'JR' or the normal 'X'. I've amended the OP.
              
 To confirm, the dimensions are:
 
 Upper: I/D 25mm x O/D 47mm x W 15mm
 
 Lower: I/D 30mm x O/D 55mm x W 17mm
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         Thanks Pl..
         
        
 I think we found the problem today - the washer that sits between the two ring nuts is missing, hence why everything wasn't tightening up nice and snug. Also neither bearing has its gasket, although I don't know if that would make much difference (never seen how thick one is). 
         
        
 I'm hopefully off to Chile in a couple of days and will raid the Yamaha dealer to get new everything for the steering head - all this Peruvian heavy-handed wrenching is taking its toll!