I just installed a Dyna S ignition, coils and wires on my 75 CB550, and that all seems to be working great, but it didn't get rid of a problem I was hoping would go away, which is a clunky idle. I need to keep the idle at around 1800-2000 RPM, or the engine chugs and clatters a little bit. It won't usually stall, but it keeps a very inconstant speed.
For example, I dynamically timed the new ignition, but it was hard keeping the bike idling at a clean 1000RPM.
I suspect that I'm going to have to learn a lot more about carbs in order to fix this problem (my plugs seem to come out sooty no matter where I set the adjusting screws). But, before I get into pulling the carbs, cleaning, re-jetting, etc., I wanted to see if anyone thinks this might be a cam chain issue.
My cam chain adjuster seems to be bound up. I can't turn it either direction. If it was just a rough idle, I wouldn't worry about it. But the clunking below 1500 RPM worries me. This is my first bike, so I'm not familiar with what is a normal sound from these engines. Any thoughts?