It depends on a million.
Big bores eat everything. Your little 200 probably lesser. Mud and sand eat chain and sprockets. In my 65hrs I've been through 2 (maybe 3) front sprockets, and toasted a set of countershaft seals. Rear is a superstealth and they hold up really well. Have a new chain and front sprocket on the ready.
Basically, you can measure the pins on the chain to check for stretch tolerance. You should be able to find these specs somewhere (I know Yamaha manuals have them). The fit on the rear sprocket should be snug in that when you grab tha chain and pull it away from the teeth it should stay nicely in place. Worn will almost pull off the sprocket.
Some will say replace everything at once - but the key to take note is that one worn element will increase the wear rate on everything else.
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