My carb rebuild kits arrived for the CB650 Sunday, so I went through and rebuilt them. Got everything back together and bolted them back on. Ran like a champ! Anyway, Monday morning I woke up with the sudden realization I didn't remember putting the accelerator pump o-ring back in. So tonight I pulled the carbs again, dropped the #2 bowl, and sure enough, no o-ring. Put a new one from the kit in, bolted everything back together, and went for a little 10-mile ride. Ran beautifully!