I have a late 70's year ST1 that is made onto a LIMA 3500 generator, I love running this generator set.  This engine has done got hard to crank, the last time it was run it was making oil so i have fuel getting in the oil somehow, i put a new injector in and that did not solve the problem with it cranking.  I used to could crank it with the handle in a couple of turns, not anymore, i hooked the electric start up and it will not start with it either, maybe smoke just a little while trying to crank on it but its not getting fuel.  I don't know much about this engine but i am mechanically inclined i can do the work, does anyone know where i should start to find the problem.

thanks