2016 Mercury 400r Serial 2B237728
About 8 months ago, motor was running like a top and out of nowhere snapped the driveshaft.
Motor was removed from boat while waiting for new lower unit, new lower finally comes in and we mount motor back on. First test run boat is way down on power but runs great. Basically feels like it is down exactly one cylinder.
Swapped all coils, did cylinder drop test, nothing. Compression is great, fuel octane is proper. Motor runs perfect, but is down several mph (5-7). Also swapped it with the old lower unit (new driveshaft put in) and same story.
Really at a loss on this one.