"After running at high speed &
"After running at high speed (4000-5000rpm) for about 20 minutes, my starboard 250 loses about 500rpms. It will intermittently pop back up in sync with the port engine but cannot hold the rpm. All internal and external fuel filters, thermostats and oxygen sensors were replaced. Any thoughts/ideas on source of problem are greatly appreciated."
"After running at high speed (4000-5000rpm) for about 20 minutes, my starboard 250 loses about 500rpms. It will intermittently pop back up in sync with the port engine but cannot hold the rpm. All internal and external fuel filters, thermostats and oxygen sensors were replaced. Any thoughts/ideas on source of problem are greatly appreciated."