8 hp is more than enough. I ran a 15 hp 2 stroke on my 21' 3400# boat and
got about 5.5 mph. I went to a Yamaha T-8 high thrust and got 6.5 mph which
is really close to hull speed. a 19' boat is only going to get a little
less than 6mph with a kicker. Go for the smaller motor with the high thrust
leg (bigger prop) Save the weight and money.
Bill

"-rick-" wrote in message
...
MikeT wrote:

Personally, I would go bigger than smaller, weight does not change on
most
between 8 and 15 hp.


On the other hand... my 15 hp kicker on a 20' boat is more than enough
to reach hull speed leaving the top third of the throttle range useless
as it tries to climb the bow wave and the prop intermittently
ventilates. I would be happier with an 8hp and the weight and dollar
savings. The older 9.9 and 15 Honda's were the same block while the 8
was smaller/lighter. Other models may be different but in my experience
8-10 hp is plenty for that size boat.

-rick-