Ybs55-8 Nut (644)

Check all aspects of the swing-arm carefully, particularly the pivot area, the suspension linkage and the chain tensioners. The swing-arm should pivot freely (with the shock disconnected obviously) on it's fulcrum but without any sideways play and the tensioners must keep the wheel running true, perfectly perpendicular to the swing arm fulcrum.
If any of the above points are not as they should be then renew the critical parts in question.
Other swing-arm related parts listed below:

9046418002
1RC2217A00
3GB2344800
90387127W0
9010910027
9561210100
9561710100
9020113015
9020110035
9010510210
9560210200
9018510115
1RC2217M00
9010510210
46X2214100
1RC2215900
9560214200
9560114200
9038710106
9010510174
1RC2235800

Check our virtual schematic to ascertain which parts would be better being replaced.

Add as many new components to the same shopping cart as you wish, new bearings 9331531758, oil seals 9310917071 and nuts 9530108600 for example, and still only pay the same single fixed price shipping cost.

This part may have other applications in the Yamaha model lineup. So, please ensure the part-number/s you order are correct for your model.