Weed Eater, edger Model # GE 21?

I have an older weer eater edger. The Model # is GE 21. The new version of this PPE 55. What are the high speed and idle adjustment suppose to be set at when rebuilding the carb. My edger has gotten very hard to start, and when it does start it is not running at a very high RPM. Any ideas about how to correct this without tearing down the carb.