I tried out my new 25hp Mercury 2stroke (tiller model) yesterday. I specifically followed the motor break in procedure- (run on all speeds but not at one consistent speed for more than two minutes, run at this procedure for the first hour.) After about an hour and a half I noticed the motor sounded louder and sounded like it was forcing itself. When this was happening I noticed a slight decrease in horsepower and the motor began kicking when I would shift gears. I don't know if this is a product of the break in procedure or it is just me being alittle precautious?