Your slowing down the torque delivery to the drivetrain with the larger gear, making it more linear, or even across the range of engine power.
With the smaller gears you blast right thru that range of power and are intantly topped out or out of the torque band for the most part (dependent on engine,needle settings,clutch,ect)
I would say that the weight of the larger gear would play a factor, but with the engines on the market today it is pretty much insignificant.
The biggest thing to realize and focus on is the ratio change.
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