What kind of work has to be done on a seized yahmaha blaster do to the oil line not being conected?

First off, let me say this, its not this guys fault that the engine got damaged. I have had this problem before. Those oil lines crack and break all the time and contrary to what anyone believes OIL INJECTORS DO FAIL! The minimum you will have to do is re bore the cylinder to an oversize piston. It will cost about 150 for the piston, rings, gaskets, wrist pin and upper bearing. You can probably get it bored for around $50 give or take. You will want to spin the engine over and see if the bearings are galled. move the rod back and forth and see if it moves without binding up.. Also pull the stator cover off and check if you have excessive up and down movement. If those tests don't check good, you will have to split the cases and replace the bearings. Once you get it running again, byp the oil injector and premix the fuel 32:1 or 4 oz to 1 gallon