wrote in message
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Calif Bill wrote:
wrote in message
oups.com...
I would like to know some info about Yamaha 8hp High Thrust 4-stroke
outboard motor when it is fully tilted up.

I am planning to get that Yamaha motor as a kicker for trolling and
backup. Unfortunately, I cannot mount it directly on the transom of my
boat. The reason is that the transom only has one opening for the main
motor. The boat has a container in each side of the opening. I cannot
mount the motor over the container because the container is a flimsy
structure. I will have to somehow mount the motor at the back of the
transom.

I could have installed a manual-motor-lift (such as the one from
Garelick); but I am looking for the version of Yamaha 8hp outboard
that has a power-trim function. This means instead of having the
outboard lifting straight up and down, I will have it tilting up and
down.

Seem like the best way is to install a motor bracket behind the
transom, mount the 8hp motor on the motor bracket, and has the 8hp
motor kind of sticking out. The question is how far that I should have
it sticking up. If it is not sticking out far enough, the cowl of the
motor will hit the container that I mentioned above when the motor is
fully tilted up. If it is sticking out to far, I am afraid that it
will add too much stress on the transom. I want the motor bracket
sticking out just far enough not to hit the container when the motor is
fully tilted up.

My questions a
1. What is the distance between the far end of the cowl and
the motor mount when the motor is fully tilted up?
2. Any downside of doing this?
3. Any better idea?

Thanks in advance for any info.

Jay Chan


Great motor. Mine is mounted maybe 12" back on a solid to the boat
bracket.
You have to look at the shaft length you need. I have the extra long
25",
which allows me to mount the motor bracket higher off the water, and when
the motor is tilted the foot is out of the water. Your dealer should
have
some required measurements.

Yes, you pretty much sold that motor to me in one of my prior message
thread. The Yamaha T8 motor is good not only because its gear ratio is
supposed to be good for a kicker, but also one of their T8 model has a
power trim option that is quite reasonably priced (I don't believe
other small outboard has this option).

Your boat must be much bigger than mine. Mine is a semi-V full 18-ft
boat. I am hoping that I will only need no more than 20" shaft.

I am asking this here because I want to know how long the motor bracket
needs to stick out. If it will be sticking out too far, I will have to
forget about this (and stick with a manually operated motor lift such
as one of those from Garelick) because I really don't want to put too
much stress on the transom. Therefore, this is pre-mature for me to
figure out the shaft length yet; I need to figure out the motor
mounting method first before figuring out the shaft length, and then I
can talk to the Yamaha dealer.

Thanks for the good info.

Jay Chan



Mine is a 21' 3400# very shallow Vee aluminum boat.