I'm seeking advise:

My NSR has run 46,000 km. The previous (and only) owner had the barrels checked and pistons and rings replaced at 30,000 km and stated the crank "had been checked and was found to be ok" (But how can you check a crank without taking the engine apart?).

I want to revise the engine during the winter.

I have the chance to buy a crank now which the seller claims has only run 3.000 km. Theoretically like new but what abuse has it seen?

At 46,000 km I can probably not assume the crank tolerances are still "within specification", right?

Should I buy the crank even though I cannot inspect it before the purchase or should I have the existing crank overhauled?

I am very indecisive, maybe someone can give good advise?

Thanks!
gepe.