lots of smoke

I just got a '01 YZ429. After riding about 2hr Sat, and 2.5hr Sun, engine started making lots of smoke. After looking at it I found the oil breather hose broken at the engine end and the clamps on the end of the hose were both very loose, and also found the coolant way bellow the proper level.

What's the oil breather hose for and would the bike smoke if this was broken before the ride?

How long can the engine run if the coolant wasn't circulating, and at what point does it get damaged, and what kind of damage happens?

What's the best way to find radiator leaks, and best way to fix?

Thanks

Not because of the breather.

Sounds like a head gasket at the least. Time to pull the head and inspect.

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