The Nova "Ruff Rider" came out in 1970. This ad shows there first prototype in 1969 with the Honda 50cc push rod hemi engine and a 3 speed transmission. Also was made available (so the ad says LOL) with a 100cc push rod hemi honda engine and a 4 speed or 5 speed trans..
Honda stopped putting this engine in there own Honda's after 1964, but made in available in other poor countries after that. Not sure how Nova purchased these engines or how many they made like this...its a mystery.
I am currently restoring one from the ground up which came from a 85 year old Gardena resident who says this one I have was the original 100cc demo model that was never sold by the Nova Company and acquired by this man after the Nova company was first sold in 1980. I am currently restoring the engine now as of 3/20/20 Looking for the original tank decals..? Here is a pic where I am at currently.