Do you just assume your motor on your inflatable boat is properly propped?
I have a 1989 tohatsu 40hp 2-stroke on a 13' bombard C3 with the factory 11" pitch prop.
I'm by no means a "Guru", but was a helicopter mech for 8 years in the great US Coast Guard and just 'felt' that my engine was over revving at wot.
I bought an inductive tach/hour meter of ebay for $21 and installed it. I'm running 6400 rpms at wot! The engine specs are 5200-5800 at wot. I'm glad I checked it.
I'm wondering how many engines out there on inflatable boats are over revving as they are usually propped for the general boat population and inflatables are so much lighter.
Just food for thought...