Whiney noise

[Gnasher]

[quote author=Dudeofrude link=topic=26561.msg320732#msg320732 date=1603212246]B. Spend the money replacing to 2 seemly fine bearings just for the sake of it to see if that fixes things

This is a f*** load cheaper than trying to repair/replace and engine if the bearings let go.
@Gnasher does Dude have to buy genuine or will these bearings (like most bearings) have a bearing code of them so he can get a set from a reputable bearing supplier?
[/quote]


All quality bearings will have a code on them, usually on the thrust face of the inner or outer race.  Yamaha don't make bearings they'll buy in normally SKF, in fact there's not that many quality bearing manufacturers.