Kicker motor mounting?
Posted March 24 2009 - 9:37 PM
I have about an 18 foot aluminum boat with an 8 foot wide transom. It would seem I have enough room to mount it to the transom off to the side of the bid motor then connect a steering arm.
However, I'm growing confused in the size of the shaft options out there. I see 15 and 20 being the most common. However, tonight I found one that I think measured 23". I'm not sure i measured it right though as I cannot find any 5HP Mecury 2 strokes that list a 23 inch shaft listed online.
Open to any suggestions on how do do this and most importantly how long the shaft of the motor needs to be? If I get one that is longer than needed will it affect my performance being too low beneath the planing pad?
Does anyone have any pictures of a similar boat rigged with a kicker that they dismount regularly?
Are the 4 strokes worth the extra $$?
Posted April 10 2009 - 9:58 PM
Posted April 10 2009 - 11:40 PM
The vertical travels are 15 1/2" and 9 1/2" I believe.
You want the motors cavitation plate to be 1/2 to 1" below the hull surface. So you will have to do some measuring of your transom height to determine if you want a short shaft or a long shaft motor keeping in mind the 15 1/2' or 9 1/2 ' travel of the bracket.
Most motors are 20 or 25 " from the cavitation plate to the top of the mounting clamp bracket but I have never heard of 23"
If your not going to use a bracket all you have to worry about is the transom to bottom of hull measurement where you are planning to mount the motor. You optimally want the motor to be mounted with the cavitation plate height 1/2 to 1" below the hull. Not saying it can't be deeper it's just not optimal.
Confused ? I tried
Posted April 11 2009 - 5:40 PM
Posted April 11 2009 - 6:29 PM
Posted April 11 2009 - 8:54 PM
It was kind of like the 3 bears approach for me. Started with looking at a 9.9 four stroke. That sucker weighed in at 129 pounds. That was too big. Next I looked at a 7.5 4 stroke and that was not long enough to mount without a special mount. Also still was up there in weight.
Then I looked at (and bought) a 5 HP longshaft 2 stroke Mercury. Mounts easily next to the big motor and the propeller will be able to spin below the plane pad of the boat (which is what you want). It weighs only 45 pounds and has it's own tank mounted on top of it. Nice simple 2 stroke that is surprisingly not too loud. I have been going through it cleaning, painting the prop and LU, rebuilding the carb, spark plug, water pump impeller, etc. Only thing left is the auxilary steering linkage.
Good luck with this.
Posted April 12 2009 - 10:54 AM
Posted April 18 2009 - 10:29 AM
Then I added a separate throttle control now its great all I have to do is drop it - hook up the steering bar - start it and go
Its well worth the separate control â€¦and the cables disconnect very easyâ€¦.
Takes longer to unscrew and remove the motor
The next step for me it to try to use a cable to connect the 2 motors that way I can get away from the bar (it rattles)
just my $.02 worth