So lately my 05 yz450 has been seeping oil outta the filter cover, haven't changed the orings yet does anybody know the size of them? This is my beater bike and runs 5w-20 penzoil take good care of it(well mechanically) but don't throw money at it. Just a practice bike. And the reason for asking is because it's caked in mud and too cold to wash it, so don't really want to rip apart. And also the nearest dealership is 300km away but john Deere has plenty of orings lol.