2003 yz450 oil filter bolts

[biggercb]

I have a problem with galled threads on my lower bolt out of the three. Is this a bolt I can get at fastenal ? Or do I need to buy it direct from yamaha?

Also, is there a way to shine up the airbox?

[grayracer513]

That bolt is a special shouldered bolt available only from Yamaha.

Here's why the threads are galled: https://www.thumpertalk.com/forum/showthread.php?t=575367

Here's how to prevent it from happening anymore: https://www.thumpertalk.com/forum/showthread.php?t=634724

Also, if you find that the threads in the case need repair, be sure you use a Heli-Coil or Time-Sert that is long enough to completely close off the cross hole, or plug the hole as in the second link. Failure to see to this can result in a loss of oil pressure.