The CVT belt is the classic wear item, and it fails from heat and hard use, not from the odometer.
A CVT belt does not wear out the way a tire does. It fails from heat buildup, from lugging the machine in too low a gear under load, and from water crossings that saturate a belt that was never designed to run wet for long. That is why experienced riders keep a spare in the machine rather than trusting the one that is in there — it is not paranoia, it is just how this part of the drivetrain behaves. Clutches wear alongside the belt and are worth inspecting at the same time, since a belt problem and a clutch problem often show the same symptoms.
Axles and CV boots take the brunt of rocky terrain — a torn boot lets grit into a joint that was never meant to see it, and the joint does not usually last long afterward. Water crossings add their own follow-up list: differentials, CV boots and wheel bearings all need a look afterward, since water and grit get pushed into places a dry ride never reaches. None of this is exotic work, but it is easy to skip until something is already grinding.
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