I wouldn't try getting a gasket, thats if they do have one, a thin smear of 518 Loctite is all it would need. I have a Ryobi whipper snipper had it for 10 years or more, only used it half a dozen times but it runs fine and crank seal is still ok
Thanks Norm, do you unscrew the crankcase halves and apply it or is it sufficient to just smear it on the join?