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!