Had warranty problems Merc 250 XS and merc sent a factory rep to supervise..he would not ride in the boat....20' Bullet....said Merc's ins co. would not allow so my mechanic was not able to test the engine because he could not drive and read the ECU computer at the same time.No wonder they are having so much truble w/that engine...no one at Merc will ride in a boat w/that model engine