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Rm250 Knock at idle

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My 2001 rm250 has a slight knock at idle.  I cant really notice it past that.  Im just running like 87 octane with a 32:1 ratio...could the octane be my issue?

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You should most definitely be running premium fuel at minimum.

The noise could be a worn out piston & possibly a worn-out cylinder too. The noise from these parts being past the service limit is most audible at idle & just above idle.

A crank will most likely be noticable at all rpms.

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Yes i would take it apart & take some measurements. If it's been awhile, there is no doubt it is time.

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