Just thought I'd pass this on. The limiter cap on the High set screw of my MS460 has kept me from 4 stroking the saw during adjustment. Also, the saw had a dead spot when going from idle to full throttle and the Low set screw wouldn't take it out. After several adjustments the dead spot still showed up. I checked the impulse/fuel line and the carb for leaks, with everything checking out AOK.
Last week, I talked to a friend of mine who is a mechanic at our local Stihl dealership and he told me that he has had this type of problem before and the best thing to do is take out the limiter caps so the saw could be adjusted right. He said the best way he found to remove the caps is to remove the carb and take a coarse drywall screw and screw it down into the red limter cap (Either Low or High). He then told me to take a pair of pliers and pull the screw out and the cap would follow. He said to repeat this for the other cap.
Well tonight I tried it and it worked perfect. A small part of the plastic was left inside, but after removing the set screws and with the help of a small screwdriver, I got the rest of the caps out.
I readjusted the carb and it works like a brand new one. I searched the threads for this type of removal but couldn't find anything. Hope this helps someone with a problem like mine.