Re: Riding in hilly area
Hills should be no problem as long as your gearing is appropriate.
My Tanaka 32cc on a GEBE system makes it seem like hills are not even there. On the flat it goes 30 - 32 mph. It climbs long moderate grades (about 5%) almost as fast - about 25 mph. When I pedal those hills, I have to go all out to go 6 to 8 mph.
It will take very steep 10% grades at 10 to 12 mph even after all the initial momentum is gone. Without a motor I would probably have to walk those hills.