My GF currently has an aero 50 which runs like a champ. It will hustle up to 45 mph with her on it as she is only 100 pounds. She rides the crap out of the thing and as I near completion of my CH150 she is talking about wanting to be able to get out on some country roads without being a huge hazard. I would like to get her up to 55 mph, has anyone done any DIO motors or AF05E motors that with a 100 pound girl could do 55? Ideally the lightweight 2-stroke engines would be the way to go for her, I just dont know how long they can sustain near wide open throttle.