I have posted some questions before when I was diagnosing the ignition system. Afer performing the diagnostics, I replaced the timer base, re-glued the flywheel magnets, replaced two bad coils, and finally got fire on all cylinders using a 8 gang spark tester with 7/16" gap. I have not serviced the carbs, but did clean out the bowls and flush new fuel through them until I got no debris. I have cleaned the high speed jets and the air bleed orifices on each carb, interesting, found a lathe turning behind one of the orifices! Don't know how long the previous owner dealt with that! The compression on all cylinders is in the 90psi range. The engine always starts easily but seems to "load up" with fuel and bog down until it is on about two or three cylinders. It will shut down if you try to throttle up. Curiously, once it rev'ed up and planed out at high rpm for just a minute, but then started to hesitate and eventually bogged down to a few cylinders. My question is: Does this just sound like a carb problem where I just need to refurbish them? What function of the carb would cause the engine to run too rich and bog down... needle and seat, more trash in carb, etc? Also, pushing in the primer or pumping the bulb does not alleviate the issue, so fuel is getting into the carbs, just too much at the wrong time. I have set the sync and link per the manual, but not been able to set the high speed timing yet due to the running problem. I'm ready to start carb overhaul, but just want to be sure I'm on the right track.