I have big repository.
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I need create new repository after changeset 601.
How i can do it?
This is not available in Mercurial. There was a project called Shallow Clones but it seems it has been abandoned.
However this questions has been asked already on SO and you will find some good leads/workarounds here:
Can I clone just the latest changesets of a repository instead of the entire history?
Hope it'll help.
You can't clone part of history, but you can try bundle|unbundle cycle (and yes, when you'll unbundle into the empty repo, some headaches are expected)