motor mount question

[el_pescador]

whats the rule of thumb on the distance from bottom of keel to bottom of your anti-ventilation plate....some say 1 inch ,justhad a prop man say they want about 2 inches....any1 knows for sure....thanks

[macojoe]

Well its suppose to be even, and if you have the right size motor it should line up fine.

If you are using a bracket then in changes 1" higher for every 12"back.

[randlemanboater]

I have read that for each 6 inches of space between the transom and the motor gearcase, you go up 1 inch. I think that rule is whether you have a bracket or not.


Of course I have also read that they make 8 engine inflatable boats for dope dealers.

[el_pescador]

motor hangs off the transom no bracket

[reelapeelin]

motor hangs off the transom no bracket




Then I would say MJ's right about it bein'
even... :D ...

[macojoe]

Yes should be even, what year boat do you have and what size motor shaft do you have??

If you have a 20" Transom with a 25" shaft motor on there it going to be to long, and if you have a 25" boat and have a 20" shaft you going to be to short

They did change the transom height threw the years.

[el_pescador]

1994 c.c yamaha 150 guessin 25 inch

[el_pescador]

sorry confused the hull is 1994, motor is 1994 measured from bottom of keel to anti-ventilation plate about 3/4 inch

[spareparts]

I allways start high and drop it down( its easier to drop it than to pick it up) . Start out about an inch to an inch and a half, above the bottom, while you're running the boat, get some one to walk to the back and see if its throwing up a V shaped spray( allmost straight up), thats a good indication its too low. The V has a fairly deep hull, and its no light weight, i don't think your going to pick a lot of performance at top end by jacking the motor high up, but you never know untill you try it. When I start out too high, it eliminates that nagging notion" I wonder if it would be better the next hole up?". Keeps from screwing with it down the road.

[macojoe]

you measure the transom from the V in the bottom to top of the transom,
You measure the motor from the top of the Cav plate to were the bracket touches the top of transom.

1" either way I don't think its going to mater!!

Stop thinking about it and start running it! ;)

[randlemanboater]

I allways start high and drop it down( its easier to drop it than to pick it up) . Start out about an inch to an inch and a half, above the bottom, while you're running the boat, get some one to walk to the back and see if its throwing up a V shaped spray( allmost straight up), thats a good indication its too low. The V has a fairly deep hull, and its no light weight, i don't think your going to pick a lot of performance at top end by jacking the motor high up, but you never know untill you try it. When I start out too high, it eliminates that nagging notion" I wonder if it would be better the next hole up?". Keeps from screwing with it down the road.

And remember, spareparts is a professional.

[randlemanboater]

while you're running the boat, get some one to walk to the back and see if its throwing up a V shaped spray( allmost straight up), thats a good indication its too low.

You mean like this? Its hard to tell from the still pics, but the spray you can see (not the boat wake) is shooting up in a nice V shape.


http://i145.photobucket.com/albums/r222/randlemanboater/101_0121.jpg

http://i145.photobucket.com/albums/r222/randlemanboater/101_0122.jpg

[Skools Out]

i called the motor and rigging guy for Parker he said the plate should be 1 inch below bottom of transom with a single but with twins the inside or center side of the motors should be 1 inch and the outside as the transom rises should be 2 inches. hope that helps.

[spareparts]

Randleman, was that trimmed down all the way? If it still throws that v-spray up after you trim it up some, you may want to raise it up one hole and try it again

[randlemanboater]

That was trimmed up. I am going to yank that motor and put my Johnzuki 4 stroke on her. I'll be sure it is not too low.

[spareparts]

you never know till you try, that's why I allways put too big a prop on and jack the mottor up too high, and then back it back down. that way I'm not constantly wondering" maybe the next pitch up or the next hole up?"