21-09-14, 11:49 AM
There was a technical bulletin issued by yam , to replace the nut under routine servic or repair. It wasn't a recall so more a 'prevention better than cure' task. For the time it takes and the damage it can prevent, it's a no brainer really. But... It does not have to be done , some bikes have done 000's of trouble free miles, others have shattered the transmission. Up to you. Took me 4 minutes !
Three lefts make a right