Yes noise would be bad.
If possible, have the pully/belt-cover removed for inspection..
If the shaft end looks okay, worth a chance.
Check for [no] welded repair there.
Sometimes a mechanic with an air wrench will bugger it.
Most mechs are familiar with messed up shaft prob.
Happened to papa's 2011 and a friend's also.
Also, the SX is like the slowest scooter out there.
B15K would be a high price.
More like <10 if Thai owned.