Just sorted out my wobbly handle bars the bushes in the handle bar yokes had gone weak and there was a lot of movement , apparently these are not a replacement part from Yamaha and you need to purchase a new top tree costing �180! Well blow that! Ive sorted it press out the old bushes which is fairly easy and replace the size you need 25.10.35.41
Which is 25mm od 10mm id 35mm outer sleeve and 41 length of inner tube.

Hope this helps some one cost me �12!