I had my original 2002 Merc 200 opti changed on my boat last year as it felt tired with almost 800 hrs on it, it just didn't run like it did when i first got the boat 6 years ago, so I had a 2016 200 opti put on. When I first got the boat i didn't have a jackplate, just a set back but had a used cmc power lift plate installed with the new motor thinking that i could manually adjust it to get max speed out of the boat but after i finished the break in, the boat felt like it was nose diving and the RPM's would hardly pass 5000 and I barely hit 58 mph, when I first got the boat I used to get it to 66 mph and sometimes 68 so after taking it back to the marina they realised the motor was set to low and they lifted it to the max slot after water testing it was a little better but still only hitting 62 mph at 5250 RPM so i set the jackplate up to as far as it could go and am now maxed out on both the motor and jack plate and am now running at 65 mph at 5350 RPM. Why this boat with the new motor is not getting the speeds i used to is beyond me.