Don't want to be a scaremonger but....
If you've ever had a gearbox seize while riding a bike you don't take any chances,
I had just returned from a high speed run on a kettle when the gearbox seized doing 30mph, I managed to stop the bike without crashing and thanked whoever is looking after me,
That was due to worn bushings inside the gears, two gears jammed,
I would be stripping it
Sorry to be negative but I think I was very lucky, ten minutes earlier doing over 100mph it could have been very nasty