I have a 2001 Starcraft SuperSport 160 with a 75HP Evinrude Ficht. The boat weighs around 850lbs. The W.O.T. should be 5250 RPMs. The most I can get out of this engine is 4200 RPM. The engine has approx 5 hours on it, just picked up the rig last month. The dealer said the boat should run...