I finally got around to pulling the carb to install Lancer’s jetset. I’ve seen several guys with posts about the fuel / air mixture screw stripping, so I decided to replace that also with a finger tightening screw that JLC sent since the carb was off of the bike. I was able to back out the fuel / air screw about 80% out and then it just stopped. Further attempts to loosen it just caused stripping of the screw, even after soaking in PB Blaster. There is a brass nub on the side of the fuel / air screw housing. Do I need to do something with this to get the screw the rest of the way out? Wish I never attempted to swap the screws because it was working fine before, but too late now. This is an ‘01 Savage with a stock carb. Trying to decide whether to drill out the screw since I think I boogered up the head too much to tighten it back in. Any help is appreciated!

The problem is that the threads in the carb body got corroded - the brass screw just doesn't want to go past the corroded area....and unfortunately the tiny slot and soft brass doesn't allow the use of much force.

I have had to drill the brass and use an extractor.......then clean up the corrosion on the threads with a tap before using a new screw.

If you install the new screw and find it starts to go in tight.......the threads are corroded and it would be wise to run a tap through to clean up the threads.  I have almost stripped the slot on new air mix screws trying to get them to thread past the corroded parts.....then I bought a tap!

It is a 6 x 0.5 thread.