https://1drv.ms/f/c/61fa2ece26d7300d/Ug ... eight=2268I documented the installation of my Honda BF2.3 on this forum, it's easily searchable.
After a few years with this setup, here are my observations:
With the 26X, it's very hard to get a mounting position where the foot is deep enough during use but also out of the wake of the big motor when going WOT. The way I have it, The foot is in the water well enough to push the boat at 4mph in calm conditions, but in rough conditions I feel like the prop would be out of the water way too much, so this setup requires me to make it back to protected waters under sail, then fire up the kicker. When turning using the rudder, the stern corner of the boat causes eddies that cause the prop to lose grip, so only long radius turns are really convenient...like 1/4 mile diameter turns.
With the BF2.3, the throttle is on the motor, of course, and the motor turns in its mount for additional steering. Reverse comes by spinning the motor 180 degrees so the prop is facing forward, but this causes the motor to buck in its mount and unless I can find a way to lock the mount down, I'll never use reverse. i just set the motor facing straight forward and steer with the rudders.
Docking with the kicker, with the throttle behind you, is very hard in any kind of crosswind. Now, not only do you have to steer the approach accurately, you have to reach down and control the throttle at the right time too. It's doable with the captain's seat lifted, but still requires a much higher skill level.
The fuel economy of the 2.3 is amazing. Using the new gauges on the DF90A, I saw fuel burns of 1.3 LPH at a speed of 10km/hr and a burn of 30L/hr at 27mph, but I would consider these preliminary as I wasn't concerned with wind or currents or accuracy, just based off of glances. But both of them are horrible compared to the 2.3, which I thought was almost empty but ran for a half hour anyway.
Refueling under power is complicated. A couple of days ago, I tried my system of pumping gas from the 2nd filter ouput through a primer bulb and spare fuel-drain line directly into the tank, as I was running under power. The primer bulb doesn't give a good flow, but it is possible to do because you only have to pump about a quarter gallon of gas. I wouldn't try it in any kind of sea state unless I was tethered in. Too hard to hang off the back of the X with the captain's seat up, trying not to spill the gas. The system is doable, but it's not easy. Right now I'm leaning towards storing a 1L 2-stroke mixing bottle on board, and filling the kicker motor using that bottle instead. Much easier to pump the bottle full from the filter drain line primer bulb, and then pour that into the tank, than to pump directly into the tank.
