Well, it was built with it by Morini engineers, who had many other engine types before it came along. It kina has the look of what I've seen on cars called an `oil-slinger' ,not sayin that's its function.
I rode my first moped,a Motomarina sebring, for several thousands of miles with the M1, until BJ put me wise to bolting up an MO2 for hill-pulling gearing.