2006 yz450f

What would cause 2 intake valves to be like .4mm. They were in spec 2weeks ago. Was running at idle and it jumped time which turned out to be a stretched chain because I twisted the tensioner a little more than what it let itself retract. Other than a few kicks I didn't hear noises etc etc. Finally got the new chain and install ed it today and just smelt gas so I check the valves and 2 intakes are .4mm. They were .14 and it ran fine.

Took it apart. Bent valves, when it jumped time I guess. O joy

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