Hello Dave
Bruce is correct, you can also run the valve in the 'A' position, facing the main jet spray hole, this will reduce the idel speed a fraction and also the over all engine speed at any throttle postion, I set all mine on 'A'. Also make sure you have put the diaphram in the correct way around, flat face facing up.
Last edited by MVC; 02/04/09 05:29 AM.