Hey guys, looking for some advice. Have 3hrs or so on a new Nissan 20hp. Last trip out at wot the engine starting making a knocking sound, as soon as I let up a bit it would stop. Only happened at wot. Checked to make sure nothing was banging around. The previous trip I had two other guys andno noise at wot. This trip I was by myself, is this noise the esg kicking in due to high rpms? Gas is fairly new, 2 weeks old. Oil level is fine. I have a 1654 grizzly, motor runs great otherwise. Trying to decide if I need to take it to the dealer or if I need a bigger prop?