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Mini-Jacker for Clamp-on Outboards

   

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Model
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MJ-1

  • $99.99

  • SKU: 421340

  • In Stock
  • Include 2 Yr Premium Accident Protection Plan

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  • 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
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.
Rated 4.6 out of 5 by 24 reviewers.
Rated 4 out of 5 by Mini Jacker Just wanted to take a minute to write a review on a really great product. Hoping to help someone like the reviews helped me when purchasing this product. I will start off by saying this is a real simple solution to a common problem. This mini jack plate is super easy to install and very strong. I used this jack plate to mount a long shaft motor on a short shaft transom and was more than pleased. If you have the same issue that I did this is the easiest cheapest fix to your problem. November 4, 2013
Rated 5 out of 5 by Maybe not for short shafts... A simple design and made very well. That's why I gave it 5 stars. That said, it didn't work for me. I have a 14 foot Jon boat with a new Merc 9.9 HP short shaft. Transom height is 15 inches. My new Merc is is close to 17 1/2 inches from the mount to the top of the cav plate so I thought I could raise the motor some with this product so that the cav plate is pretty much even or slightly higher than the bottom of the boat. No such luck. My motor idled fine but would cavitate approaching plane at the lowest possible position this jack could be mounted. If you have a long shaft you are trying to jack on a short transom boat, this is a good choice. No good for raising a short shaft even higher. Get something adjustable or be happy with what you've got. Just watch out for the rocks. September 11, 2013
Rated 5 out of 5 by Just the ticket! I needed something to match a 22 inch motor to a 20 inch transom. When it arrived I was pleasantly surprised to see how stout it was, it is very beefy and strong looking. I drilled it for 6 3/8 inch carriage bolts and filed the holes square to lock them. Although probably not necessary I made some 1/4 inch aluminum plates for the inside of the transom and used large fender washers on the bolts. I sealed everything with 3M 4200. Boat performance and handling is now as it should be. Elegant and effective fix for the poor matchup by the manufacturer/dealer. August 7, 2013
Rated 5 out of 5 by Excellent Product This is one of the best products I've ever purchased. I have a 1542 Tracker Jon with a 16.5" transom and a 15HP Yamaha outboard with a 22" long shaft. I bolted this plate on so the top of the mounting flanges that sit against the transom are one bolt hole higher above the top of the transom and the cavitation plate ended up 1.5" below the bottom of the transom. This plate is super heavy duty. It comes with a 1.5" thick plywood mounting board that fits snugly inside the aluminum plate. The plywood came untreated, so I gave it two coats of Thompsons Water Seal. I mounted the plate to the transom with four 3/8" grade 5 bolts, and for security, I drilled out a 5th hole at 1/2" and put a pin lock that you would normally use to lock a trailer coupler to the receiver. That baby ain't going nowhere! July 15, 2013
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10 Questions | 29 Answers

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Q: 
1 answer

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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.
5 months, 3 weeks ago
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A: 
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.
4 months, 3 weeks ago
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 - Springfield, MO
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2 years 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 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, 2 months ago
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 - Upper Potomac River
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Q: 
5 answers

Will my motor cavitate

Details: 
I have a 15" transom and short shaft 15" motor would like to run in shallower water.
would this product help
2 years, 11 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 ago
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A: 
yes
2 years, 4 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, 4 months ago
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Best Answer
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.
2 years, 10 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
2 years, 11 months ago
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 - springfield, mo
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Q: 
6 answers

What size bolts do you use?

3 years 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 ago
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A: 
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, 1 month ago
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A: 
I used 3/8" bolts. The length will depend upon your transom configuration.
2 years, 4 months ago
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A: 
3/8" minimum.
2 years, 4 months ago
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 - La Crosse, WI
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A: 
3/8 stainless
2 years, 10 months ago
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A: 
1/2 " stainless steel.
3 years ago
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 - Barrie Ontario Canada
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Details: 
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 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 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 ago
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Anonymous
 - Maryland
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3 years, 5 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, 4 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, 2 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, 3 months ago
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3 years, 8 months 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, 2 months ago
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A: 
20 HP or 150Lbs max
3 years, 5 months ago
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Q: 
3 answers

lower on a transom

Details: 
could this be used to put a short shaft outboard lower on the transom
5 years, 2 months ago
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A: 
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, 2 months ago
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A: 
You betcha, Just mount lower on the transom.
3 years, 5 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, 4 months ago
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 - No. Calif.
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5 years, 3 months ago
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A: 
Yea I mounted mine about a inch higher than recomended and i have had no problems with my 35hp jet.
3 years 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, 3 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, 4 months ago
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 - No. Calif.
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5 years, 5 months ago
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 - ontario canada
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A: 
Your shaft should be either a 15' (short) or 20' (long). It wouldn't matter which one. It would work.
3 years ago
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 - Barrie Ontario Canada
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A: 
Not likely. This will add about 4" in transom height.... 18" is likely a small HP short shaft, which is designed to go on a 15" transom. You could mount it lower on the transom, so the top is 2" below the transom, but it would be hard to get to the mounting screws on the outboard as the transom would be in the way.
3 years, 2 months ago
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