Suspected blown head gasket/and or warped head after rebuilding this beast. She ran beautifully for a few hours and then died out. Not seized, just died at idle. Plug soaking wet in coolant. Did see a little weepage on head gasket near the head bolts on right side. My bad, rebuilt tranny and didnt tighten head to spec. The bolts on the right side of head could be tightened about 1/2 a turn? Suspect head bolts under cam area loose too? No coolant in oil. Any advice on rebuilding the head again? Have a used yz426 head as back up if mine is warped. I learned my lesson and appreciate any procedure to follow.