another problem that is in the 72"300s instructions is the way you get your 2degrees down thrust on a sideway's mounted motor. using supplied 2 piece mount.If you put washer's behind the top mount that will space that mount out from the firewall but will not change down thrust. You just get slightly staggered mounts. Better way is to sand the back of both mounts at a 2 degree angle and mount them. that keeps the mount beam's parallel to each other and at 2 degree's down. incident meter works well in this situation