Lawn-Boy 5127

Hi, I recently bought a lawn-boy 5127 and cannot seem to find parts for it anywhere. I have looked at a few different parts websites and non have a parts diagram. So I was wondering parts from the F series engines are interchangeable? that way I could order parts for a different model. The reason I wanted to order parts is because I noticed there is fuel around the lower crank seal, so i wanted to re-seal it.

thanks