To reduce Vibrations you should concentrate on the engine and the suspension parts.
If the vibration is of only noise it must be due to tail console and other plastic covers. if you are feeling the vibration (whole vehicle vibrates at a particular speed) then check for loosened bolts that fixes engine to the frame.
A smooth engine Vibrates less, Check the engine oil, valves and tappets.
There will not be any use if you change the washers to rubber from metal ones.
Check your shock absorbers and front fork.
At times even loosened bolts of the foot rest will make us restless.
Please check and update
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 Tame the Road........
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