Yep, the castor oil is not the correct refinement. It’s gumming up your engine. It may take a few runs to get the engine to clear out. Set the carburetor to described settings and slowly cycle back bod forth on the throttle. Throttle up until it threatens to die and then back off a bit. After a tank or two you should be able to get to full throttle and fine tune the high speed needle. You want to close the needle just enough to break into a nice clean 2 stroke tone.