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Assuming it's just a leak and not something serious (burnt piston, broken valve spring or etc) and just leaking (worn rings, bore, or valve job not sealing): Yes, it should be fine to run for several...

When you do the leak down, listen 3 places and it will tell you where it's leaking.

1. Carb = Intake valve leaking
2. Header = exhaust valve leaking
3. Breathers = Rings

Was the engine cold?...