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White smoke?!

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My friend has a yfz450r and it smokes a little on start up and when you rev it real high he thinks it's the valve seals and that he's gonna need to get his valves re done any thoughts on what it could be let me know. Thanks

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I had this same thing happen to me on my 08 KFX 450R it was the valve seals getting weak.

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White smoke, could be condensation from last ride or just the heat and moist air when put away.

Blue smoke means oil. I'd check the spark plug, if no significant issues there, let it ride!

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White smoke might be coolant leaking into the cylinder. The usual suspects are a bad head gasket or water pump seal, neither of which are a common problem for the YFZ450, but I'd check the coolant level for a while.

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