Interesting idea Aulit.

I could envision that tray motor mount allowing the motor to shift left to right
as well as up and down a few centillimeters. If it were hinged at the rear of the tray. The conical dirve wheel your sketch shows could be modified to have a tapered step so the 2 drive surface would be on a parallel plane to the tread of the tire. The tray would have to have a spring tensioner at the front so the motor could move up or down when drive diameters are shifted and also in order to keep even pressure on drive wheel.

I think your idea could work well. I'm using a front drive Tanaka engine now that is quite similar to this but only has a single ratio friction drive wheel of 1 inch.(or 25 mm) It uses the spring tensioner feature I added to the drawing. My motor looks similar to the French Solex motor. I also understand that in some of the states in the USA, motor bikes are only allowed one drive ratio for the motor. Yet there are many parts of the world where the two ratio or infinate cone drive ratio could be used well.

Permit me to use your drawing Aulit to illustrate the spring tension & dual ratio
drive wheel.



I wish my Tanaka "Free Spirit" motor had these features, but where I live 20 Mph (32 Km/h) is the speed limit. Still it could help compensate for upward grades in the road.