Right now the trike has the Polini 75cc, 11x45 gearing, yellow GY6 springs. With my 200 lbs ass on it, a 6 yo, and a 3 yo kids next time, the thing is screaming off the line at super hi RPM's but a snail pace. Builds up speed quick though. Uphill take offs are out of the question right now. I have a 48T sprocket on the way which should help quite a bit.
Next stop is to get a seat belt, put polycarbonate folding front and back windows, rollaway vinyl sun roof, luggage trunk and whatever else I decide to do.