That's not recommended for points. The smoothest idle is a couple degrees more advanced than you want. Try turning the crank with a fixed end wrench (I use a monkey wrench) until you get the F and the mark lined up. Then, holding the wrench in place, adjust the points until you see them just open. You are set at that point. Depending on your points plate, you might need to adjust 2/3 points too.
Also, check to see if the plastic washer is still behind the advancer mechanism. If it is not, then you need to make one out of metal. HondaMan has the info on how to do that, or I could share it with you if you want. Just PM me for it. Without the washer behind the advancer mechanism, you'll get poor high rpm performance. This is only an issue for a few years of CB twins and fours when Honda used a plastic washer as a shim.
You can set mixture and idel rpm by ear on a twin. Warm up the engine, and then shut it off and pull one plug. Start the engine on one cylinder and adjust your idle mixture screw to get the smoothest idle. Then, adjust your idle down to 1100 rpm. Repeat on the other cylinder. Once done with that, spend some time making sure both carbs open at the same time with throttle twist. you can do this by putting one finger on the adjust screw on one side, watching the other side, and twisting the throttle.
One last thing about these twins. The carb boots are probably torn or leaking. Pull the carbs and check them. If you see any cracks when you squeeze them, then you need new carb boots. They are cheap and readily available.
Good luck.
Camelman
