A single eyestrap and 1/4" pin has worked fine with a 3 hp motor. I'd go to a 5/16" pin before adding a second eyestrap.

:: Looks interesting. Do you need a second eyestrap below
:: the mount tube too?
::
:: Larry
::
:: :: To prevent the motor mount and motor from leaving the
:: :: boat when it's put in reverse:
:: ::

:: :: - Install a small eyestrap immediately above the stern socket.
:: :: - Drill 1/4" holes - through both top and bottom of mount tube - that are in-line with eye of eyestrap.
:: :: - Insert 3" long x 1/4" diameter quick release pin  (McMaster-Carr #95165A043) through eyestrap and then through mount tube.  
:: :: - Reverse away without worry.  

:: ::
:: :: John
:: ::

:: :: -------------------------------------------  

:: ::
:: :: :: We tried a 3.5hp, but it was really way too heavy for
:: :: :: even my beefiest crew to manage removing or installing
:: :: :: on in even flat water off the back of the boat.
:: :: ::
:: :: :: The Honda 2hp (you'll need the long shaft version) is
:: :: :: 30lbs before fuel, and moves the boat at over 4 knots in
:: :: :: flat water, more than enough for when there's no breeze.
:: :: :: We don't need the motor when it's blowing, so that's
:: :: :: really the only time we need it, if you think about it.
:: :: ::
:: :: :: When it's running, just make sure you keep your crew in
:: :: :: the back of the boat to keep the shaft and prop in the
:: :: :: water. And, whatever you do, don't turn it around to put
:: :: :: it in reverse, as the post will walk out and the motor
:: :: :: will go glug-glug-glug as it disappears below the
:: :: :: surface.
:: :: ::
:: :: :: (Only has forward, the prop stops at lowest speed; but
:: :: :: the boat is so light, don't really need a reverse.)
:: :: ::
:: :: ::
:: :: :: :: what are people recommending these days in terms of
:: :: :: :: lightweight outboards for the express? Freak's - #51,
:: :: :: :: needs a new motor.