(SOLVED) Dead cylinder at idle? Low temp on header collector

Take the breather off. hold the carb open and listen for air including at the exhaust at the end of the pipe. Take out the spark plug and air up the cylinder. Listen where the air is coming from . If its the intake then its the intake valve, The exhaust its the exhaust valve or the breather its the rings or a piston. Now you know what it is. I am guessing it needs the heads redone and new head gaskets