ORIGINAL: jaka
Hi!
Sorry!
Soaking a model engine (or any engine for that matter) in Castor oil is the worst thing you can do ...It gums up with age!!!
Much better is to use ATF oil !...Or any other oil...but not Castor oil!!
Who cares if it gums up with age... just soak it again with normal fuel, run it and the engine will be fine.