I have a 1985 FSM for my truck but can't figure out what my trucks factory settings are for the carb... My truck currently runs like crap, and I just want a baseline for tuning... There are 3 carb adjustment screws; I think: one is idle, one is mixture and the other is fast idle? How many turns are these supposed to be at? Any help is appreciated.... I know it wont run perfectly, I just want a little better than its running now, and the mixture screw that isn't supposed to be adjustable has been modified so it is now adjustable.... TIA

 

In FSM page FU 26 and 27 it describes the mixture screw setting. 31/2 turns out from al the way set i.e. tight Warning do not overtighten, can damage tip of screw. The rest of the Fuel System (FU) section details the carb. setting and adjustment.
HTH
Cheers,
Nathan

 

is there just a general spec to have it set to? i dont know about the all involved hooking up a tach and doing the 23* angle thing and all that stuff... i just want a baseline of settings

 

same boat as you bu ti have 83, just wanna know how many times to turn the screw

 

i got a 81 and i rebuilt the carb and took them out and cleaned everything and cant get it back like it was b4 i rebuilt it..........