I borrowed this from my ultralight to check the speed of my sprocket change from 48 to 56 teeth.
Was way overgeared with the 48 and 3.25 ratio chainbox. top speed is still the same at a tad over 40mph. Gets there a lot quicker now and can now climb moderate hills without pedal assist.
My new 66cc slanthead /41t, is way faster at takeoff and much more low speed power, but maxes out at bone ratteling 35mph. The HS has hardley any vibration at all speeds.
See next post for more on the HS