Motorcycle Repair: 84 FXRS OIL LEAK, stock air filter, harley manual

Question
"I JUST BOUGHT AN '84 FXRS THAT WAS NOT RIDDEN FOR APPROX 2 YEARS. IT KICKED OVER/FIRED BUT OIL GUSHED/STREAMED OUT FROM AN OPEN HOUSE AT THE BOTTOM OF BIKE. IS THIS A BREATHER HOSE OR SHOULD IT BE CONNECTED TO SOMETHING? WHAT SHOULD I DO ABOUT THIS? (THERE SURE ARE A LOT OF OIL HOSES!) THE FACTORY HARLEY MANUAL IS NO HELP.
ALSO, THE TANK WAS DRY AND THE LINING IS CRACKED INSIDE. SHOULD THE TANK, LINES, CARB BE CLEANED OUT. SHOULD THE TANK BE TREATED AND/OR SEALED? THANK YOU VERY MUCH. RAY"

Answer
Ray, the oil that gushed out is from your oil pump check valve leaking oil into the crankcase over time.  When you first start the bike it all blows out the breather hose, which was originally connected to the stock air filter housing.  Not a problem.  Always run the bike for 5 minutes before changing the oil so you get all that oil out of the crankcase and back into the oil tank for changing.  Otherwise you change the oil, start up the bike, and the dipstick blows out because of all the extra oil having no room in the oil tank.  You can leave the breather hose where it is.  Some people put little breather filters on the end.  You should replace the fuel lines from the tank to the carb and the crossover line at the bottom/front of the tanks.  Otherwise you'll get little specks of black rubber sticking in the float needle valve and your carb will leak gas.  You should drop the bowl, clean the crud out of the bottom and run an .018" needle drill through the idle jet after you remove the rubber plug (if it has one).  You can use a piece of small copper wire if you don't have a needle drill set.  Clean the main jet out too.  Good idea to take the petcock off and clean the fuel screen that sticks up into the tank too.  I wouldn't even bother with the tank lining unless the tank screen keeps clogging up.  Then you'll have to reline it with KREEM or some other tank liner.