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Switch it over to the Hydro Tec HD prop shaft and solid racing hub and say good by to thrust washer problems and bent shafts!

How many hours on the motor? Do you do alot of idiling? Long no wakes, sideimaging/graphing alot? What oil are you using?

Wsm pistons +1, stake the locating pins, bore to .001 in over on all cylinders for extra tolerance, good clean fuel without ethonal if possible, Always run the octane rating your motor has been tuned...

I had a 2014 225 pro xs we had in our shop one time doing almost the same exact thing and we chased this problem to the moon and back. We suspected injectors but had no real accurate way to test the...

Make sure the anti knock washers are installed on the driveshaft especially if you just did a water pump replacement as they need to be removed to get impeller off. + 1 on lube the drive shaft...

If the boat was equipped with a Carbon Canister vented fuel tank it does not require an FDV, these are only used in "sealed" Pressure Relief systems. I would try running the boat on a remote fuel...

+1 on fuel and air pressure ck
While running the motor with the fuel/air pressure gauge installed have your tech SLOWLY release the air pressure off the gauge while trying to keep the engine running...