My friend has a new 255 Hallet with a 525. Motor only has 8 hours on it so far. He is running a 26" 4 blade prop and only getting 4800rpm out of the motor. Those motors have a 5400rpm set limit. Hallet told him that it is the right size prop for the boat. Do the mercury motors have a built in limit preventing the max rpm until the 10 hour break in period is over? It is almost like the motor is in guardian mode or something. Any thoughts on why he can't get the full rpm from a brand new motor other then a pre-existing mechanical problem from the factory?