No, not a twin engine motorized bike....
Here are two Dax 70cc engines. The clean one is a bearing engine, the used one a bushed engine.
Notice the obvious differences-
Acorn nuts (bushed)vs. double wide open nuts (bearing).
Chrome welded up intake (bushed) vs. cast aluminum (bearing).
Rubber grommet for mag wires (bushed) vs. nothing (bearing).
M8 studs (bushed) vs. M6 studs (bearing).
Carb float chamber drain (bushed) no drain (bearing).
The casting is better on the bearing engine.