Hi everyone, I've been slowly restoring a 1982 Custom with a G54B engine with its original Mikuni carb. It runs and drives great, only issue I havent been able to figure out is that it refuses to idle. It misfires horribly, produces a puffs of fuel rich whiteish smoke, and I have to put just a slight bit of throttle input to make sure it stays running. I've been trying to figure out how to adjust the carburetor but I can't for the life of me find the mixture screw. I've looked through the manuals on the forum and I see it labeled, but when I look on mine, it's just a flat piece of the carburetor. There appears to be a plug or something in its place but I'm not quite sure. I've adjusted the idle speed screw and it helps a little, but the mixture is still all out of whack.
Thank you for any help!