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03 450 valves

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hey guys i'm rebuilding engine in 03 450 . its a supermoto i bought fev month a go.it had a bad bering on the counterbalancer shaft but i took it all a part bought all new bearings for the tranny and engine and all the seals, bike had brand new top end . i know this year on the bike had some valves issues . i did leak down test on the valves and they are sealing properly. question i have is what do i look for on the valves to know if they would be prone to breake ? where do they usualy fail?

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They dont ususally break unless theyre stainless or have heavy duty valve springs. they usually receed into the head first, then you gotta regrind the valve seats and get some new valves.

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