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Mini-Jacker for Clamp-on Outboards

   

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MJ-1

  • $99.99

  • SKU: 421340

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This cast aluminum offset type jack plate is designed for clamp-on mount outboard motors up to 35 HP. Improves performance and handling of smaller or lighter boats. The Mini-Jacker also allows mounting of long shaft motors to shorter shaft transom boats. Mini-Jacker mounts to boat transom with bolts and then engine is simply clamped and/or bolted on. The Mini-Jacker stands off transom 4". The engine mounting surface is 11-1/2"Wx10"H and features a vertical offset of 3". The overall width of transom mounting flange is 17". Mounting hardware not included.

  • Designed for clamp-on outboards up to 35 hp
  • Improves performance and handling
  • Also allows mounting of long shaft motors to shorter shaft transom boats
Mini-Jacker for Clamp-on Outboards 4.5 5 25 25
Great Purchase Highly recommend this item for those running a long shaft motor on a short transom. Great performance, handles better, planes better even better speed, though not rocket speed with a small outboard but noticble for sure. Did not have to extend any cables to install. Easy... August 15, 2011
Perfectly affordable simple solution Simple straight forward solution to a problem. Super value. Mounted it on my 16’ flat bottom. For the cost it is not worth trying to rig up something on your own. You need to drill six 3/8” holes in the unit and then in your boat. Make sure that you have the unit high enough on your transom to give clearance to be able to rotate the clamp dogs on your boat motor. I got min about an 1/8” to low and had to put a shim under the motor. My son and I had it mounted and ready to go in about an hour. Make sure you seal all holes. I also put a couple of coats of spar polyurethane on the plywood block. I found it to work great. Boat planes out much better with no water spray now. Definitely a winner. April 28, 2012
Ingenius Idea Everyone knows that long shaft motors are a dime a dozen and that its the short shafts that are hard to find. This product will bring value back to the long shafts and allow short transom boaters to equip long shaft motors and get the same handling and performance as their short counterparts. I recently purchased the Mini-jacker and installed it on my 16' Grumman and mounted a 98 Mercury 25hp long shaft. It works amazing. Installation is a breeze if you have the right equipment....drill and some sort of fasteners. The design of the jack plate allows universal mounting for height preference. Well worth the money, and a lot easier than making your own or raising your transom. March 18, 2009
Unclear instructions The product itself is well-built. However, the instructions are woefully inadequate. How much effort would it have taken to write things out clearly and add a couple of diagrams? I called the telephone number on the instruction sheet for more help, but it was a wrong number - presumably because they don't want to waste time on customer service. February 16, 2015
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11 Questions | 30 Answers

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1 month, 1 week ago
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A: 
What I received back from the manufacturer is as follows.

Sure as long as the outboard doesn't exclude the maximum HP of 35 and Max Outboard Weight of 150 lbs.
1 month ago
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 - Springfield, MO.
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Q: 
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See bellow

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I have a 14' Sears alum boat. Transom is 15 1/2". I am running a 15hp Merc. It's 17 1/2 - 18" from where the motor sits on. Top of the transom to the cat plate. My motor sits down too far in the water creating back spray when under speed. There is too much motor shaft in the water. My cat plate sits about 2 1/2 - 3" bellow the bottom of the boat. Isn't this product designed to raise up the motor eliminating this issue? And isn't this exactly the issue you had? I really do not see why it didn't work for you. If your cat plate was bellow the boat the equal distance that you raised it up with this product, why wouldn't this have worked? If the cat plate is just bellow or equal to the bottom of the boat, that's there should not be an issue. I am concerned it won't work but reading your review, it probably won't for some strange reason.
11 months ago
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Hi, thank you for your inquiry. You may need to raise the MJ-1 up a bolthole or to get the motor up far enough out of the water.
10 months ago
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 - Springfield, MO
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2 years, 5 months ago
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A: 
Depends on your set up, but not likely. If you are clamping the engine down absolutely not; the clamps won't fit between the jack and the transom. The tiller handle, cables or steering linkage might not make the angle or pass the clearance test either. Study all those things before you buy or install
1 year, 5 months ago
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A: 
No, you can't use it to lower the motor because the motor handle or housing will be below the top of thed transom, preventing the motor from being turned side to side.
1 year, 7 months ago
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 - Upper Potomac River
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Will my motor cavitate

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I have a 15" transom and short shaft 15" motor would like to run in shallower water.
would this product help
3 years, 4 months ago
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A: 
I have direct experience here. For me the answer was no... It will not work. At the lowest possible mounting position the cav plate was even with the bottom of the boat, my motor still cavitated. Weight distribution made no difference either. pulled it off my 14 foot Jon boat with a new mercury 9.9 short shaft. Get an adjustable plate for this application. Just know you might spend $300 or more just to gain a quarter inch in elevation.
1 year, 5 months ago
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yes
2 years, 9 months ago
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 - Sebastian, FL
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A: 
I have used my short shaft with this product but I have to load the boat stern heavy to make sure the motor is picking up enough water for cooling.
2 years, 10 months ago
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A: 
The important factor is the distance the cavitation plate is below your boat. mine is 1/4 inch. If you rase your motor too high, you will cavitate and over heat/burn up motor. put a straight edge on your cavitation plate of your motor and measure to bottom of your boat.
3 years, 3 months ago
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Staff Answer
A: 
This cast aluminum offset type jack plate is designed for clamp-on mount outboard motors up to 35 HP. Allows mounting of long shaft motors to shorter shaft transom boats.

**MAX OUTBOARD WEIGHT - 150LBS
**MAX HP - 35
3 years, 4 months ago
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 - springfield, mo
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Q: 
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What size bolts do you use?

3 years, 5 months ago
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A: 
3/8 inch stainless steel bolts. The length will vary on the thickness of your transom. Measure that and add 1/2 inch for your optimum bolt size. Round up to the next length increment if your in between available bolt sizes.
1 year, 5 months ago
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I used 6 3/8 inch stainless carriage bolts. I drilled the jacker to 3/8 inch, then filed the holes square to lock the carriage bolts. I also made 2, 2 inch x 10 inch x 1/4 and drilled them the same for the inside of the transom. I sealed everything with 3M 4200.
1 year, 6 months ago
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A: 
I used 3/8" bolts. The length will depend upon your transom configuration.
2 years, 10 months ago
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A: 
3/8" minimum.
2 years, 10 months ago
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 - La Crosse, WI
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3/8 stainless
3 years, 3 months ago
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A: 
1/2 " stainless steel.
3 years, 5 months ago
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 - Barrie Ontario Canada
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I have a 16', 52" bottom alumacraft with a new 2009 mercury 25HP fourstroke, longshaft. Will this minijacker lift my motor too high, causing cavitation? I fish shallow marsh and could stand to run a little shallower. I would buy this jack plate if I knew that the L/D was not excessive for my boat. PLease advise.
3 years, 6 months ago
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 - Beaumont, Texas
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A: 
It shouldn't. Mine doesn't. My 25 merc 2 stroke runs fine. I was reluctant at first but my water test proved the instructions correct and all works great.
3 years, 5 months ago
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 - Barrie Ontario Canada
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A: 
You can mount this minijacker anywhere you want as high or as low on your transom to get your motor at the perfect height.
3 years, 6 months ago
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Anonymous
 - Maryland
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3 years, 10 months ago
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 - Valmeyer, Illinois
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A: 
It raises the height 3". I mounted mine 2" above the top of the transom and added a piece of 2"x2" square tubing onto the transom so I would have something for the top bolts to mount to. I used a total of 8 3/8" bolts and it solid. it works perfect for gaining the 5" although the instructions recommend mounting it no higher than the top of the transom.
2 years, 10 months ago
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A: 
It will raise it at least 4". You could go 5 and likely 6t if you mount the top of the mounting plates above the transom top. To do to this, you need to have a flat transom. Some aluminum boats have a lip on top of the transom, that make this difficult, unless you shim the mounting plate, which would work fine, but would take a bit more finesse to install than just bolting it on.
3 years, 8 months ago
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A: 
I have sucessfully used the Mini Jacker for two long shaft motors on jon boats, ahd you will easly get the 5" you are looking for.

I use a 2x4 to raise the transome hight another 31/2 or so, and this allows me to use the top bolt hole on the Mini Jacker for better security.
3 years, 9 months ago
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4 years, 1 month ago
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A: 
This thing is solid. I mounted a 15 HP long shaft on it that was at least 110 lbs. It is rated for a 35 hp and seems likely to easily take that. I think it is a bit over enginered and would easily take that, as long as you bolted it on adequately with quality hardware.
3 years, 8 months ago
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20 HP or 150Lbs max
3 years, 11 months ago
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Q: 
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lower on a transom

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could this be used to put a short shaft outboard lower on the transom
5 years, 7 months ago
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Not the best application for this as the offset is about 2" and it would be hard to get to the mounting screws and the tiller would likely hit if you were down about 2" or so.....
3 years, 8 months ago
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A: 
You betcha, Just mount lower on the transom.
3 years, 11 months ago
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A: 
No, I own one and if you try mounting it lower on the transom then the vertical offset portion of the mount will be too low to allow the outboard motor clamps to clear the space between the transom and the mount. I've seen welding shops cut a small portion out of the transom, re-seal, then mount a short shaft on a long shaft transom. Locally, $150.
4 years, 9 months ago
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 - No. Calif.
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5 years, 9 months ago
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Yea I mounted mine about a inch higher than recomended and i have had no problems with my 35hp jet.
3 years, 6 months ago
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Anonymous
 - Maryland
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A: 
I don't know about as high as you wished, but I know you can mount a motor with a 20 " shaft on to a boat transom that measures 15 inches.
3 years, 9 months ago
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A: 
Yes, the mount comes with no pre-drilled holes. The indentations you see are starter spots to drill through so that the mount is very adaptable to many boat applications. You can mount with 4,6,8 or whatever amount of bolts you desire by drilling.
4 years, 9 months ago
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 - No. Calif.
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