A friend brought his friends CB500 to me to trouble shoot. They had rebuilt the carbs but were leaking like crazy and when they put it back on, it ran for a bit and then never started again. So i said id take a look and see what it might be. I pulled the carbs and adjusted the floats and re installed, 1 carb still leaking but should be an easy fix so i left it on for now. Started trouble shooting the no spark issue. Found that one of the points wires was loose, once I plugged it back in i started looking at the timing and power to the coils, points gap was also too big (corrected that). Hooked up the timing light, finding that only cylinder 4 was getting juice. I was using my timing light to check each wire for power. HOWEVER i didnt think to go ahead and throw new plugs in. I finally pulled the other 3 plugs out and they would not spark at all when grounded to the engine. SURELY not all 3 are bad, once i got a new plug in they all had spark.
I have not checked the caps yet, but ive never seen 3 plugs go bad all at one time.
