yamaha 40heo 6h4 problem

hey guys just purcahsed my first boat, its awesome and it has a old 2 stroke 40hp yammi starts first go idles fine but when im in full throttle the power fluctuates every like every 4 seconds not drastically but its noticeable in noise and feel when in the boat...i noticed that one of the fuel lines on the 3rd carb had a slight fuel leak (slow drip) from the hose could this cause that problem?(replacing all fuel lines real soon)....I need help on adjusting the timing and the carbs but i have no clue on where to begin if someone could help me with some info that would be great

replaced all fuel lines... running really nice now haven't tested in water...started first turn of the key and then died after 15 seconds adjusted each carb half a turn out equally and now it idles smoothly but a tad bit smokey when revving in neautral should i go another half turn out or just leave it there? i want it to be running slightly rich