PhantMan wrote:
not only are the lower units
the same, but Honda doesn't even put lower ratio gears it's high
thrust model. The only difference is the prop diameter (9.25" vs 10")
and the decal on the cowling. Who'd a thunk it.

Charlie Morgan wrote:
Yamaha models:
F9.9 (regular thrust) gear ratio: 2.08 prop size and pitch: 9.25x10.5
T9.9 (High Thrust) gear ratio: 2.92 prop size and pitch: 11.75x11
That's a pretty substantial diofference, wouldn't you say?

I would say, uh huh.
The reason I asked about Honda is because I have the 20hp model and
wondered if I have room to swing a 10" prop. Apparently I do. Might
come in handy someday although chances are I'll never use it for
anything but scootin' my skiffs around. Standard 9.25" prop works fine
for that.

Back to Yamaha: I was thinking the 8hp model would be better for a
smallish sailboat, say a 22'-25', but now I see it's only 6lbs lighter
than a 9.9. Not enough to matter imo. I think I mentioned in some
other post that I wish somebody would produce a 2 cycle high thrust
25" shaft engine (I like "light" even more than I like "power").

I once had a 6hp 25" Evinrude on a Catalina 22 that was light (60lbs)
but not high thrust. It worked ok in most situations but a large dia,
low pitch, four wide bladed prop sure would've been nice.

Rick