Re: does anyone know what is the correct idle speed?
i almost agree with Nougat. my idle is set at "just a little bit higher than enough to keep it running."
sometimes if i come to a quick stop my idle will drop, probably from fuel sloshing around in the float bowl, and other times, if you misjudge your start, you'll kill the motor from dropping the clutch too fast. if the idle's a little higher, you can save it without stalling.
with a well tuned bike i can get the idle down so low you can barely tell it's running, but the rideability will suffer.
as long as it's not revving way up, or bogging too low, you're good.
as far as specs, i doubt there are any.