To my eye, the cogs which can be seen, look to have little or no wear. The chain, however appears to be too "thick" thus I wonder if it is the correct size and is maybe meant for a 5-6 speed rear. Try a new nine speed SRAM, KMC, or Z (or other brand) chain first. I really think the bike has the wrong chain.
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Bob
Enjoying the GA coast all year long!
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