Troy:
I have a number of typical 2 strokes in storage. I usually pull the muffler, plug, tie a string around the whole thing and drop it into a bucket of WD40 (2 gallons or so), and pop the lid on. This has worked well over the years for 2 strokes, what about YS 4 strokes? Will the WD effect the seals/rings etc? Perhaps it would be better to just give them a bath in castor oil and seal it up in a zip lock?