I am curious to see what method others use for nitro boat engine break in. I have ran offroad nitro most of my RC life, about 15 years, so i am very familiar with nitro engines. I have ran boats befor, but now im getting more involved in it than i was. I didn't do a heat cycle with my Aqua .18, i didn't see how could. So what i did was richen it up to the point where it would blubber, and blow a lot of smoke, but still run. Then i ran it at different speed intervals for the first 6 or 7 tanks, while running rich. Next i began to lean it 1/8 turn after each tank untill it ran at its max, then when it was tuned i backed it off about 1/8 turn.