I bought mine used for my 03 cr125 so I never received instructions. Well after installing it I had coolant coming up thru the studs/nuts on the head. I think Im supposed to use the metal head gasket along with the rubber orings that come with the fathead? I just used the orings figuring thats how it was supposed to be, kind of like most 2 strokes (yz,rm,kx, etc). Btw if anyone has one, I need the torque specs. I've emailed Lukesracing (they sell them) but the sooner the better, thanks.