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Hi I bought a Suzuki gs500f year 2005
When im riding and go back to n the rpm some times take a while to go down doese anyone know if the is normal thanks

If you are referring to the idle speed being slightly higher after a highway run then - yes that's normal.
It's because a highway run heats everything up including the oil. Hot oil is thinner oil an so there is less oil drag at idle for the same fixed throttle setting.

If you mean something else - please describe it.