problems starting 81 xj550

So first of all, this is my first bike and my knowledge is pretty lacking of motorcycles and engines all together. That being said, i have replaced many different parts on my cars throughout the years and im not afraid of getting dirty. So my bike does not start for me. I can occasionally get it to start when warm but 1 in 20 times. I am getting good spark, and good fuel levels. When running, it runs perfectly. I can pop start it, however when i try that it is weird. If i get going down a hill, no matter what gear i pop it into, it doesnt fire right away. it slows down and then when almost stopped it fires but weakly. more like sputters and with the proper amount of throttle it starts. The only problems when running is starting from a dead stop, going into first is almost impossible because it dies every time. Even when it is completely warm, if i turn it off, it will only start once in a blue moon. The other problem is there is an oil leak. The hose coming off of the case leading into the air box seems to create a vacuum and sucks the oil into the air box and then into the air filter. Any advice?

 

Your carbs are letting fuel overflow into the crankcase. DO NOT attempt to start the bike again until you remedy the problem.

First step; homework.

Your reading list:

TECH TOPIC: The Real Costs of Maintenance

The Information Overload Hour

IN THE CHURCH OF CLEAN (carbs)

THE SECRET LIFE OF CARBURETORS