OK I am revisiting this post instead of starting a new one.
Its been almost a year since I worked on these, I put them back on today after looking at them in the basement all winter.
I installed two NOS low speed jets, flushed them out before storage, and now have them on the truck again.
I swapped carbs front to back to be sure its not a manifold problem.
I have one that will not react to the mixture screw. I can take it clear out or seat it, no difference. The carb is clearly running lean, just a slight choke will bring it on line. Full throttle or cruise is OK as far as I can tell, haven't driven to far. So today I pulled a dirty core carb out and pulled the idle circuit parts out to compare and look at. I just don't see a problem. I even pulled the small copper plugs out and ran a pipe cleaner down the holes.
I am going to pull it clear apart and give it another cleaning, All I can figure is theres a plug from the main jet, over to the idle jet.
This just can be this hard, I have rebuilt tons of carburetors and nothing has gave me more trouble then this one.
Joe
