WD40 is fair, but there are better lubes out threre,...ill be honest i didnt haveanything else last ttime i reassembled and engine and used wd40 to coat everything....3 in one is good too, .....youll need to heat the engine in an oven or use a heat gun(personal fave) Youll need to remove cylinder head, and back plate, remove piston liner, then piston...then take the prop hub off which will require atleast 250 degrees, same thing to pop out shaft....Im sure by the morning someone way more qualified than me will give you a better answere. Ive only changed bearing three times.