If the 9.9s were detuned 15's, and the only major difference was the carbuetor and on some the tuned exhaust, how dangerous to the motor is it to take a unconverted 9.9 and run it at the rpm level of a 15 by switching to a lesser pitch prop? Has anyone ever intentionally done this on purpose and is it wise to do it.
I would never do this to an outboard because of the potential of blowing the engine, but is this the exception to the rule?
I would never do this to an outboard because of the potential of blowing the engine, but is this the exception to the rule?