I am running twin Yamaha 200s on my scarab and they ran perfectly since the beginning of summer. About a week ago I ran into a problem with my port engine not running enough rpms. I could usually get the engines up to about 5500rpm wot. At wot when things went bad it only ran at about 4200rpm. I changed all the spark plugs, cleaned out the carbs, new fuel pumps, new lines, new ball, new fuel/water seperator, and new fuel filter. After I had done that the engine ran fine for about 10 minutes and then I lost all power on the high end. The engine now maxes out at about 2800-3000rpm at wot. I cleaned the carbs again and put new gas in again and I still cant get over 3000rpm at wot. Any advice will be appreciated. Thanks - Mike
