Heya, I replaced the carburetor base gasket because I had some massive vacuum issues (if I placed my hand over the carb the car actually ran better) and now I've got very high idle. When I first got the gasket on it was idling @ 4000rpm. So I backed both idle screws out (RBS carb) and was able to get it down to 2000rpm -- with the screws completely backed out. I'm completely lost at this point.
There are three adjustments for idle on a carburetor. the idle stop screw - back it out to lower the idle. the idle mixture screws - turn them in to lean the mixture and out to richen (unless you have a Holley emission carb then it is reversed) The high idle or choke compensation stop screw. It is adjusted after the others are adjusted - so back it out so it doesn't touch while you are making your initial adjustments. I suggest that you get a Haynes manual and follow the idle adjustments in it. If you are like some others who have a hard time with books let me know and I will give you a step by step adjustment procedure to adjust your idle. PaulS
The 2 idle mixture screws are not for adjusting idle speed. Your throttle is not completely closing. Back off the idle screw under the throttle and start there. As mentioned above, your choke adjustment could be affecting it as well...
Yeah.. it was much more stupid than that. My return "spring" which is a hammer that limits how far the throttle can open at idle was stuck on the throttle cable, causing it to run at 75% throttle all the time. I suck.
Yeah, I almost mentioned the return spring, but I figured that would be too obvious. 'Glad you got it working...
