Burning Oil

So long story short i managed to bend my three intake valves and took my head into a shop for some work.The three valves were replaced and installed by the shop. I recently put the bike back together (2004 yz450f) and headed to saint anthony, idaho for a week.

The bike runs great but I noticed that i was burning oil pretty badly so i figured that my piston's oil ring was bad. Feeling stupid for not replacing my piston when i just had my head off, I tore the bike back down to take a look at it and everything looks perfect.

So I am wondering if there is something the shop i took my head to could have done wrong that is allowing oil through to be burned. The oil loss is pretty significant and definitely noticable...

Thanks!

They could have failed to install, or damaged during installation, one or all of the intake valve seals.

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