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Engine Sound

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Hi!

All the bikes has an amount of engine sound. (I'm not talking about the sound of the muffler and I'm also not talking about piston knock or something like this.

I'm talking about the normal sound of the engine itself.)

Brand new bikes are pretty silent in the engine area. But with time somehow this sound can increase.

Is it possible the reduce the engine sound? For example a new piston makes the engine more silent? Or new bearings, or what?

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