If your ped idles well after it warms up, your idle mixture is good. Mant peds run rich at idle to allow them to idle soon after starting. A quick test of whether your idle is too rich is, after a reasonably long ride when the engine is thoroughly warmed up, turn off the gas with the ped still running. It should eventually just sputter and die. Many peds will rev up a lot before quitting, the mixture leans out as the fuel level in the carb lowers and provides a more efficient mix.
You can check for too lean at idle by applying a little choke to a hot engine or covering the air intake gradually with your hand.. If you can make the idle speed increase at all, you are too lean. You may also want to idle for a while after a ride and then check the plug color to make sure it is not too lean.
The up side of a correct idle mixture is that you are less likely to foul your plug. The down side is that if you coast down a hill with the throttle closed, you will get very little lubrication. Two cycles are not good "engine brakes" for this reason. You should "blip" the throttle occasionally to give the cylinder some lube.