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Your best bet is to routinely check it and when it is out or getting out of specs make the adjustment. After a few times it will give you a good indicator on what is the correct interval for you.
 

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That's gonna be conditional. How well you keep the chain cleaned and lubed, and how hard you accelerate, probably are the biggest factors in my opinion. I wouldn't be surprised if a brand-new chain needs adjustment shortly after installation, but if your chain is older and is needing frequent adjustment then it's likely needing replacement soon.

Just check it periodically. The manual likely has an explanation.

I don't accelerate too hard, I have an automatic chain oiler, I also clean the chain every few thousand miles, and most of my miles are at steady highway speeds. My chain hasn't gone out of spec between oil changes.
 

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2018 Kawasaki Ninja 400
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Clean, lube, and inspect every 500 miles, adjust as necessary. If you keep it in perfect shape and ride regularly a standard O-ring chain should last 10-12k miles (no track) typically. An X-ring chain should last 15-18k miles (no track).
 

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Clean, lube, and inspect every 500 miles, adjust as necessary. If you keep it in perfect shape and ride regularly a standard O-ring chain should last 10-12k miles (no track) typically. An X-ring chain should last 15-18k miles (no track).
Forgot about z-ring chains that supposably outlast all other chain types.
 

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Forgot about z-ring chains that supposably outlast all other chain types.
I had to look that up, but they do exist. Looks like Z-ring is an X-ring designed to withstand twisting and side loading, which is for ATV purposes. You need an X-ring, not a Z-ring for any motorcycle especially a street/roadrace bike.
 

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