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You may be right Davekfl. As I recall when my boat was new I had a problem with the tach. There was a setting on the back of the tach where you adjusted it for the number of "poles" the alternator had. To this day I haven't a clue what a pole is on a tach. I resolved the issue by adjusting the setting at the rear of the tach and then running WOT and checking the reading on the tach. As I recall I had to do this a couple of times. Once I was in the ballpark of manufactures WOT recommendation for RPMs I assumed it was on the correct setting for "poles". Each setting produced significant changes in the RPM reading( 1500 to 4000 RPMs) so I felt relatively safe to assume I had the right setting. I think I'll recommend he check his poles before he reprops. It'd definitely be cheaper.
I'd still be interested in what prop others are running on their 170 with the Yamaha F60.
As a post script, who knows how I ever broke my engine in. I'd imagine it was at slower speeds/rpms than manufacturer recommends. What a great opportunity for dealers to properly learn something about rigging.
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