I'm 17 and just bought my first bike, a 1979 Honda CX500 Custom. It only ran on one cylinder when I bought it and I am attempting to fix it up. The guy who sold it to me thought that it had a bad coil, but I checked it and I'm getting healthy spark. Next I thought I had better focus on the fuel system, mainly the carbs. I sprayed carb and choke cleaner through the carb and the jets, and cleaned the jets with a wire from a wire brush. Now it sometimes runs on two cylinders, but most of the time just on one. I'm thinking I will try to spray seafoam through the carb and see if that does the trick. Since the ignition system tested good I'm convinved it is a fuel delivery issue. It has custom straight pipes, and when it fires one two for the first time in a while it shoots flames out the exhuast, which leads me to believe that the carb is not in really bad shape. The throttle cable was hanging on by a thread and it finally broke, so I am awaiting a pair of new ones. I'm handy on cars, but I'm new to working on bikes, so if you have ANY advice, let me know. Thank you.