Hi everyone, so I'm trying to get my bike running right. Here's what I got. And here are my issues 73' bs38 carbs. One up pilot, two up main jet. Mix screw 1 turn out. Carbs never been synced. Carbs are original rebuilt awhile back. Good shape. 80' engine, uni pod filters, open short headers, 1mm overbore. New build less then 1000km So I've been running the bike with stock carb settings and noticed it was lean up top. Idle was a Lil lean as well and had the mix screw about 2.5 turns out lol. But left plug was always rich. Switched to my current jet setup. Idle has changed drastically. Bike runs better up top I feel I can almost go further in 5th gear now. But when I really give on the throttle it stutters. As if something up in the midrange. 4-5 gear not so bad. Anyways the bike got worse I notice a tiny bit of black smoke on left side. I pulled plugs both pretty black. Cleaned em up rode a few times pulled em left super black, and right side looks so so. Just pulled the carbs checked float height. Looks OK at 25mm. Checked fuel filter. Clean. Put new plugs. Fired it up right side shot a red flame or two and left a Lil black smoke again. How is it so rich at idle. What things should I check. I know this must be a carb issue. Timing is good bike sounds great when it's working properly. Starts so easily. I'm new to this so I'm running out of ideas I don't wanna fuck anything up. I almost wanna just throw money towards new round slide carbs. What else should I check. Why is the left always more rich. I never looked at the diaphragms... I dunno what else. The bike was running I sprayed carb cleaner everywhere found no leaks. I'm kind of all over the place as you can tell. Any suggestions would be helpful thank you.