This is to set the fast idle cam posistion so it is on the right step when started and running. There is also a procedure for the fast idle cam rpm in the book. Of course to do it all right you need to set everything on the choke including the choke pull-off , choke unloader and the choke lockout specs. I would set and check all of the settings when rebuilding a carb which you can check and set to make sure all aspects of the choke system are working right. You can just follow the manual but from the question I assumed he just wanted to know the specs and how to set the fast idle speed. Course its always best to check and set all of the choke/carb settings. Ron