duibhceK
Husqvarna
AA Class
I would check the amount of metal, stuck to the draining plug.
Definitely do that. If there are flakes and they have a coppery/golden colour there's damage to bearings (most likely either crank shaft or piston bearings). If the flakes are silvery it is probably piston rings or cylinder damage. If there's no flakes you're probably lucky.
When doing the work, getting the engine out and back into the bike is actually the biggest part of the job. The engine itself is relatively easy to work on (I know from experience
) When the cylinder is off the bearings can both be checked for (up&down) play. No need to split the crank unless there's play on the crank shaft bearing.

for a new TR650 engine after confirming they could not give me a lead time on a new crank shaft. They were apparently unwilling to take a crank shaft out of one of the engines they had in stock. For reference: I paid 4500EUR for the entire bike when new.