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Author Topic:   Jack Plate for 13 Sport
skred posted 04-15-2014 10:40 AM ET (US)   Profile for skred   Send Email to skred  
I'm thinking about installing this jack plate from Vance on my 1987 13 Sport with 1981 35 Johnson outboard. It has a Michigan Wheel 15 pitch aluminum prop.

http://www.vancemfg.com/untitled1.html

Scroll down their listings to: 3 inch Jack Plate JPL 4300 Adj. Outboard Boat Jackplate.

Seems like an inexpensive way ($135.00)to improve performance. I know it's manual, but I have no trim/tilt, and can survive without it.

skred posted 04-15-2014 10:42 AM ET (US)     Profile for skred  Send Email to skred     
Sorry, wrong reference. I meant the JPL 4000 6 inch version, available on Amazon for $135.00
Teak Oil posted 04-15-2014 05:32 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
Never used a jack plate on a 13, but the best bang for the buck would be power trim add on, which by its nature is also a jack plate with a few inches of setback.

The small version used to be around $400 IIRC.

skred posted 04-16-2014 03:29 PM ET (US)     Profile for skred  Send Email to skred     
T.O.: I Looked into power trim - unfortunately, it's outside my budget. I've found that for my usage, I can comfortably get by without it. But, it would be an advantage - I believe - to be able to raise my motor a couple inches, since I'm using a clamp-on mounting on my 35 Johnson. That would bring the cavitation plate up to level with the hull, or a bit higher, and can be adjusted manually. Prevailing opinion here is that it would improve performance. I don't know, however, how significant the improvement might be...

Teak Oil posted 04-16-2014 07:37 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
Do you have a tachometer? You may need to change pitch, depending on rpm.

Expect the plate to give you up to 2-3 mph at best.

Mike Kub posted 04-16-2014 08:31 PM ET (US)     Profile for Mike Kub  Send Email to Mike Kub     
That 35 should be bolted on rather than clamped. Peace
Teak Oil posted 04-17-2014 02:34 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
Good catch Mike, yes that motor needs to be bolted on for sure
skred posted 04-17-2014 11:04 PM ET (US)     Profile for skred  Send Email to skred     
I agree the motor should be bolted. It would be bolted to the jack plate, which would be bolted to the transom.
A related question: is the bolt pattern - there are only a pair of bolt holes (midway up the transom bracket) on my motor - the same on my 1981 35 Johnson as the standard pattern on - say - a newer 40 hp engine?
Powergroove803 posted 04-21-2014 11:30 AM ET (US)     Profile for Powergroove803  Send Email to Powergroove803     
I used the minijacker and it worked very well, around $135 price.
http://www.thmarine.com/products/Outboard-Jack-Plates/ Static-Height-Plates/Mini-Jacker-
skred posted 04-22-2014 09:32 AM ET (US)     Profile for skred  Send Email to skred     
I looked at that one also. If I am correct, it's mainly designed for using a long shaft motor on a 15 inch transom. Therefore, clamping my motor on would raise it too high - unless there's the provision for bolting the motor onto the plate. It's still non-adjustable, however. Then, again, I suppose it could be "customized" with 2 slots for the mounting bolts... That may compromise the integrity of the assembly, perhaps....
Tom W Clark posted 04-22-2014 10:13 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     
The Mini-Jacker only provide a maximum of 3" of lift so it is not suitable for putting a 20" motor on a 15" transom. It will, however, do a good job of gaining some height with a 15" motor.
dg22 posted 04-24-2014 02:43 PM ET (US)     Profile for dg22  Send Email to dg22     
The nice thing about the motor you have is it's light weight (120 lbs?) so adding an extra 11 or 20 lbs depending on the jack plate you go with should not affect the way the boat handles.
skred posted 04-24-2014 03:11 PM ET (US)     Profile for skred  Send Email to skred     
The weight is exactly why I searched out this motor. Perfect for this 330-lb. hull. Also the JPL4000 from Vance is a 6-inch setback, 4-inch height-adjustable plate. Looks to be ideal for my boat....
Right now, the motor is clamped on the transom, and the cavitation plate is almost exactly aligned with the bottom of the hull. when I bolt the motor on, I can raise it a little bit, but there's no adjustment if I do that. Hence, the jack plate offers good advantages, I believe.
dg22 posted 04-24-2014 04:38 PM ET (US)     Profile for dg22  Send Email to dg22     
Yes, that is a good choice of motor for that boat. My 1973 50hp Evinrude is a little on the heavy side (187 lbs) so I just used a block of wood to give me an extra inch and then bolted the motor on (in addition to the clamps). I run a SS prop to reduce cavitation in the turns. The setback of the jack plate should give you better water so the cavitation may not be an issue when you raise the motor, as long as you don't go too high.
skred posted 04-26-2014 09:36 AM ET (US)     Profile for skred  Send Email to skred     
Thanks, all - for the help. I'll update this when I get everything set up.

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