need help guys with my 79 xlh getting ready to go to americade and have problem. front cylinder has spark new wires new plugs new coil if not faulty. but seems to be running only on rear cylinder,idles but wont run under a load. rear cylinder exhaust hot front cylinder blowing cold air out of pipe. some people tell me just valve adjustment or rings some head gasket any ideas? My father said if head gasket pipe would still be hot?help please gotta roll tommorow.