I purchased two Yamaha 1100 Wave Ventures last year. Both are 1997 110 HP 3 cylinder engines. Before purchasing I performed compression test on both engines and they were at 122 psi for ea. cylinder on ea. machine well with in Yamaha specs. of plus minus 5%. These machines are supposed to run at 62-64 mph. The one does and the other one runs at 57 mph. Both impellers on the jet pump look exactly the same condition along with the same clearance around the wear ring around the impeller. Any suggestions on how to get the slower one up to speed.