1986 115 hp losses power

[prolinetom]

At full throttle over 4000 rpm engine runs fine but cuts back to 2000 rpm put in nutrel then runs fine till i go over 4000 rpm never had any trouble before rebuilt carbs last year ran fine. please help thanks tom

[99yam40]

does your alarm system work?
Could be going into low oil or overheat but buzzer not sounding.

Do you have gauges that should show what alarm comes in?