Noticed my 3rd cylinder wasn’t firing, pulled the plug and was pretty dirty. Definitely running too rich. Put in a new plug and fired instantly, drove it for about an hour, turned it off, next start up it didn’t fire again (plug was filthy again) Would adjusting the pilot screw on 3rd carb for a for lean mix be my best bet before looking into the float, etc, or ripping apart the carb itself and diving into that? I pulled the plugs on the other cylinders and all looked fine, would I need to adjust all 4 pilot screws or simply just the one currently running too rich?