Someone Help Please!!!

[chunk690]

I bought a kfx400 and put new piston and rings in it. It fired up and ran and idled fine for around a minute or so, then shut off. Tried to fire back up , and seems like not getting any compression again!

[2muchquad]

did you torque the head properly?when it got hot the aluminum head could have warped or something if it wasnt bolt down right.was the cam chain tensioner installed properly?could have jumped time as well.