I am having a similar issue on my 2001 125hp ELPTO 2+2. No power between 2k and 3k revs. Idles ok, WOT Ok, Midrange and transition to 4 cylinders is terrible. Running options are either under 10kmh or over 30kmph. Fuel hoses replaced after they perished and blocked the carbs. Carbs re-built. My...