loose header after ride

I have an 09 yz 450, and after every ride, I clean my bike and notice the header pipe is loose at the flange, I have torqued the nut and Allen bolt to spec everytime, but it always comes loose? Any ideas, rhank

yep your going to have to use loctite, you wont need the red stuff, just the blue

my 450 and 426 seem fine with out it, but i had my snowmobile that the whole Y pipe fell off,! rattled all 8 bolts out, but some loctite and it was good after that and still is

Okay, I just put it back together using the blue loctite, thanks guys

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