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I'll take a stab..
if I remember right...
dispersants are used in oils to keep contaminants in solution, or to keep the contaminants suspended in the oil. If they are not suspended then they will collect in the pan and pockets and form sludge.
A non-dispersant oil for break in shouldn't be a problem if the oil is only used for a couple hundred miles and then changed.
But if he has a motorcycle why not use a motorcycle oil? Using an avaition oil in a motorcycle reminds me of some guys using a car tire on a motorcycle.
It may depend on which motorcycle he has. If he has a newer bike with a wet clutch, he may have problems with the clutch slipping. Motorcycles with wet clutches need oil with the JASO MA/MA2 rating or the older SG/SH. If he has an old BMW or Guzzi with a dry clutch and solid lifters he will need an oil designed for solid lifters (SG or SH).
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