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Hello, here is my new to me 2018 z125. It’s the first bike I’ve had in about 10 years. Definitely the smallest bike I’ve owned.
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You may want to look at replacing that chain/sprocket. That rear sprocket is toast... and I can't tell if that is a rusty chain, or if it's just a faded gold...
 

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You may want to look at replacing that chain/sprocket. That rear sprocket is toast... and I can't tell if that is a rusty chain, or if it's just a faded gold...
The chain is gold (not my choice, but it works with the bike I guess) and is supposed to be pretty new according to the seller. How can you tell the sprocket is toast? I will try to take a closeup pic of the sprocket for further analysis.
 

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See how the teeth on the sprocket are all rounded off? If they round off the chain will eventually jump teeth on the sprocket... and possibly come off... If that happens, you might have a very bad day...
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Here is a good sprocket for reference (quick google search)
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