NEW VMAX Middle Gear Damper

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harley been using that idea for years and years off the main drive off the motor in the form of a spring loaded sprocket
 
A wet sponge works well to make things damp!

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4x4 ATV's have the same thing, I think, yea think, it is to cushion low speed jolt when you accelerate or decelerate. Think of it as a cusion in the otherwise very direct drive system. The spring allows the gear's to almost slip, I suppose very rarely they could jump a tooth, but from what I have seen there is not room.

The video you found shows the vmax's cushion has a spring rate enhancer, so the more the power, the more spring tension there is, and the less almost-slip there is.
 
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