I have a Yugo SKS, which currently is inoperable. It has about a 50% fire rate; that is it'll fire every other round when I pull the trigger. I have cleaned and cleaned and cleaned the bolt until the damn thing squeaks when I move it around. I have boiled it to get any crap out of it. I have blasted it with brake cleaner. I have worked oil into it to lubricate it, and when that didn't work I cleaned the everloving piss out of it until there was no oil left.
As of right now, I'm thinking that it's not the bolt that's the problem.
I'm about to pull the trigger group apart and replace all the springs in it and see if that'll fix the problem. Does anyone out there have any suggestions?