My 12.5 I/C quiet briggs motor shot fire out of the muffler then died in the middle of a yard today.So in my mind i'm looking at it with this big stupid look like what the f..k happened? I let it cool for about 3 minutes and try to start it again and i realize it has no compression.So i pull it and it spins and spins and spins.What happen? any ideas? For some reason i think one of the valves is stuck open leaving it in this state,NO compression. What do you guys think.I haven't pulled the head yet but i'm heading out side now to find out whats wrong. I have to have this running buy tomorrow!!! any input will help me alot!!!