Hey Wellsie,
Only the 250cc , it uses a chain that is off a suzuki , it shouldn’t need replacing unless the bike has had a hard life or its around 50k old ish…
However , the “tensioner” on the bike is automatic, that deals with the tension /& chain stretch as motor spins, the tensioner is usually the “first item” to replace as they do wear out more than a cam chain does.
One way of checking the chain is to listen to it as it spins on the motor.
another way is to remove the top valve cover
- inspect cam sprockets for wear (the teeth eventually wear down)
- touch the chain, if it feels saggy , it could be sign the tensioner is worn or the chain may need replacing
the service manual only has this information about timing chains.

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Hope this info helps!
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