Remember that 4 cylinder 250s cruise sitting on about 9000-10000RPM on the open road (depending on gearing and how hard you want to push your licence) so 50000km is a lot 'higher' than the same KMs on a less revvy or larger bike. Watch out for things like difficult starting, smoking when first started and when decelerating etc.
I had my '87 MC17 from 26000km to 56000km (sold for $2500 OMG!!!) and had no dramas other than blown fork seals (due to stone chipped fork legs). I was pretty fussy about warming it up, and about maintenance, which probably helped.
Curiously, it used more gas than the CBR600F I replaced it with, probably because it is always revving so fast.
Good luck, hope this helps, they are great little bikes.
A
Nobody knows what human life is, why we come, why we go,
so why then do I know, I will see you in far off places?
Stephen Patrick Morrissey
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