After spending weeks rewiring, I am on to the next 'to do' on my list. I never wired a motorcycle, created a electronics box and taken apart switches before so it was nice to get that under my belt. Next are the carbs. The previous owner had straight throug long pipes wrapped from end to end. I cut them and installed HD Sportster mufflers. Much better look and sound for me. First thing I noticed was kick back, sputtering and rough idle. I took the spark plugs out (see pic) and they are both black. So through some reading it seems it's rich. 5he spark plugs are 7s and not 8s so I can get that out of the way. I plan on searching, downloading and reading a ton (like I did with the wiring) but first off questions -how do I identify what carb I have and what year it is. The bike is an 81, would the carb be 81? -do I try adjusting air/fuel mix before jumping in too deep? -what's the difference between rebuild and rejet. If I have to take it out, I could essentially do it all, couldn't I?