74 CB 550 woes

Joined: 01 Sep 2006 Posts: 6

Need a little help here, this bike is driving me nuts. When the bike is cold it runs/idles great. When it heats up it starts to miss, buck. I put in new points/condensors, coils, plugs ect and it still doesn't go away. I rebuilt and synched the carbs prior to this. I know it is electrical in nature because the fuel system is working flawless. Does anyone know where to go from here? I did time it using the static method not a light. Wonder if I received bad points? I'm lost and tired of replacing parts most likely not needing replacement. Any help would sure be appreciated. Thanks

Joined: 01 Sep 2006 Posts: 118 Location: south bend, In

missing on all cylenders or just one

Joined: 01 Sep 2006 Posts: 6

that's the wierd thing. When it's cold, (and running for five/ten minutes on the road), nothing misses. After that it's either number one or two because I hear it on my left pipe. Once I hear that miss it gets progressively worse, loosing power, getting hesitant, slight jerking, and generally running like crap. I can still keep it a 60mph but it's working hard and popping like crazy. Let it cool and the cycle starts all over again. I have to believe it's electrical because when it happened again today I immediately put the synch gauges to it and nothing changed...fuel wise it's running exactly where it's supposed too. I replaced the obvious electrical components that I thought would cause it but...

little update: I think I found the problem. When doing the carb sync it just dawned on me that their is most likely a problem with my petcock. When taking gas out of the tank to put in the test tank I noticed that fuel was coming from both sides of the petcock then would stop from the side feeding the last two carbs. I will take that off today and see what's up. I'm hoping this is it.