Medium SwampRunner®

View Customer Performance Stastistics

Engines 8 to 16 HP

We recommend our MEDIUM SWAMP RUNNER® mud motor kits for small to mid-size jonboats and skiffs. 

Our Medium kit ships with 8” & 8.5" diameter propellers, generally used with engines between 8 and 16HP.

Kit Weight: 57 lbs.  

$499.00 + shipping


Exclusive Features

There are two other US based resellers of inferior Thai longtail brands who have made attempts at copying features first introduced by Swamp Runner, but the following is a short list of differences you will NOT get from one, or the other, or both of these other two brands being offered;

♦ LIFETIME WARRANTY on coupler shafts and housings!  That's right.  Swamp Runner offers the best warranty in the industry, and is the FIRST & ONLY mud motor company to offer a lifetime warranty on key drivetrain parts. All Swamp Runner couplers are manufactured from heavy duty steel that will last a lifetime, which is why they come with a LIFETIME WARRANTY.  We DO NOT utilize aluminum couplers, which will corrode from electrolysis and can eventually crack.
♦ SPS couplers and tiller handles are hot-dipped in galvanize, followed by an additional coating of paint.  This double coating offers far superior corrosion resistance and paintability over the chrome offered by others.

♦ The coupler shaft of this kit rides smoothly on a high quality sealed Japanese radial bearing, while economy Thai long tails have no bearing or utilize a cheap unsealed Chinese bearing.
♦ We offer tiller handle mounts for left or right hand steering.  Most other Thai longtails have right handed steering only.
♦ Our transom bracket is far deeper, wider, and heavier built, offering a safe 2" bite on the transom.  Other Thai longtails have only a 3/4" bite, and/or are made from thinner stamped steel.
♦ SPS transom bolts have transom pads, providing a larger surface area to grip the transom firmly without digging into the transom and damaging it.
♦ The winged heads of SPS transom and coupler bolts are constructed of heavy duty steel, while economy Thai longtails use cast aluminum winged bolts that can break.
♦ The diameter of our tiller handles will accept custom throttle levers, while other Thai longtails have a diameter that will not allow it.
♦ Swamp Runner longtails have grease zerk fittings located in numerous locations to make lubrication easy.
♦ The engine base of our Small, Medium, and Large kits can be moved forward and backward for balance adjustment.
♦ The gimble bracket of this Swamp Runner kit pivots smoothly on sealed roller bearings, while the economy Thai longtail brands use dry bushings cut from conduit pipe.
♦ All our kits come with a high quality tethered kill switch.  We don't use the cheap switches that will deform and fail after a little sunlight.
♦ The rails of the engine mounting base and transom gimble brackets on this kit are .48" thick, and constructed of  JIS SS400 grade structural steel (equivalent to AISI-1018 or ASTM-A36. 
♦ SPS utilizes refined manufacturing techniques that are a trade secret, to produce a highly balanced shaft assembly you just can't get anywhere else.

   And there are other differences we don't talk about....

Compatible Engines

Customers sometimes ask us for examples of engines that will fit our Medium Swamp Runner™ mud motor kit.  There are simply too many engine makes and models, to list all engines that will fit.  The following is a short list of just a few of the engines that will fit this kit:

Honda 8hp GX240 models: GX240UT2QAE2, GX240UT1QAE2,
Honda 9hp GX270 models: GX270UT2QA2, GX270UTQAE2, GX270UTQXC9
Honda 11hp GX340 models: GX340UT2QA2, GX340UT2QNE2
Honda 13hp GX390 models: GX390UT2QAA2, GX390UT1QNE2, GX390UT2QXC9
Carroll Stream Engines: 11hp, 13hp, 16hp
Harbor Freight: 8hp Predator 301cc, 11hp Predator 346cc, 13hp Predator 420cc
Home Depot: 13hp Lifan 389cc, 15hp Lifan 420cc
Duromax XP16HP, XP16HPE

Without physically seeing and measuring your engine, we cannot guarantee this kit will fit your application.  If your engine is not listed above, you will need to consult the engine manufacturer, or take some measurements of your engine to ensure it meets the following requirements;

Engine Requirements

  • The engine must have a horizontal output shaft.     
  • The output shaft must be 1 inch diameter (non-tapered) with keyway.
  • The engine side cover bolt circle diameter must be: 5 inches
  • Engine base bolt pattern must be: 7 11/16” X 3 ¾”

For boats with transoms exceeding 17" in height, or with bottom widths between 40" & 48" please advise us you need a 100" shaft. We do not recommend longtails for vessels with a bottom width exceeding 48".

NOTE: The 9hp Carroll Stream engine, the 9hp Lifan engine, and engines with gear reduction box options are not compatible with this kit.





"Best investment for my company ever!" - Jason K. @ JaxWildlife Outfitters, Jacksonville, FL.

"Hunted early teal with the new motor.  We've got some pretty high water in the marsh, but that little 13hp motor sure impresses!  I couldn't believe the stuff we went through; saw grass, mud, sand, thick cattails.  I had a try pretty hard to get it stuck.  With three 180lb guys, and gear we got 14mph outta my light 14' topper.  I was only getting about 16mph with an outboard and the same load, but it wasn't half as capable. Cant wait for the start of the regular season and Lake O!"  -
Ron P., Cape Coral, FL.

"I recently bought one of your Medium Series mud motor kits and it’s awesome! I took it to the Mississippi River this past weekend for opening day of teal season. I put a 16 hp Duramax engine on the kit and the whole set up on a 16’ 48” flat bottom and ran 10mph in 4 inches of water and mud.  I drove a 13 hp (brand name omitted) longtail when I guided in Arkansas and this kit goes through anything it would, plus the fact I could buy 3 of your kits versus 1 (brand omitted).   I will take those odds any day." - Donnie J., Corinth, MS

"I just wanted to give you a follow up on the mud motor kit... IT IS AWESOME! I have attached some pictures of where we had to go and we got there with no problem. It normally takes us an hour and a half to walk in but we got there in less than ten minutes with the boat and kit. We also limited out on wood ducks.... That's really all we have in Eastern NC.  By the way, how can I go about getting a couple more t-shirts in large? They are cool as heck and my dad and buddy want one:)   Thanks again!"  - Ed S., Hookerton, NC

"Man I got to tell you, ever since I put this new engine in the river near my house everyone has been crowding around and wanting one. I told them how to contact you.  Now I’ve seen four people running your set up around here and that’s awesome.  I’ve been running mine hard and it wants more every time.  I absolutely love it.  Literally I can take $20 and fish all day $10.00 for the truck and $10.00 for the boat.  That’s why this kit is so awesome and efficient.  You can’t beat that.  I hope you all are doing well and staying busy."  - Jesse N., Columbia, SC

"Hello, I just wanted to say that your kit has worked out great for me, I bought the medium kit and coupled it with a 15hp LIFAN motor and it help me and my brother access new hunting spots, and that led to many great days of hunting last year!! On a 1436 jon w/ 2 guys 2 dozen decoys and a 70lb dog we were able to get around 15-17 mph. Do you know if there is any way I can achieve faster speeds?Anyway thank you for putting out a great product."  - Richard H., Saint Paul, MN

"I'm a disabled vet and this is my ultimate solution to me getting back on the water where I should be for a realistic figure without complicating things and getting into debt.  I am very happy with this kit and your service. Thank you."  - 
Chance G., Ormond Beach, FL

"My swamp runner kit surpassed every expectation I had! I thought that for the price I may have to weld in supports or modify it some other way, I was wrong! Extremely high quality and it is easy to tell that this company takes pride in their product, even their bolt heads are custom with SPS. Thanks for making a great product."  - Dustin, B., Boyceville, WI

"I would like to thank yall for all yalls support and kindness on helping me find and order parts for my boat and motor.  Yall have the best customer service of anybody I know.   Yalls product is in my opinion better then the name brand stuff like *####* and all that.  My friend has a 35hp *####*  that he spent over $6,000 on and I go everywhere he does, so I will say and admit that I'm a proud owner of a Swamp Runner.  On saying that I was wandering if yall do decals.  I do a lot of catfishing and duck hunting with people who have flat bottoms and they have outboard motors and they love my motor.  I would love to sponsor yalls name along with yalls product  on my boat or truck."  -Austin F., Scottsboro, AL 

 "I love this SPS.  I looked for over a year, and did lots of research.  I got the best. I put mine through living heck and it takes it.  Best investment I made in a longtail. - Bill C., Citrus Springs, FL

"My Swamp Runner is still kicking butt after almost 4 years now!   I have bragged on your kits and some of my friends have bought kits also.  I have seen the up grades that have been made to the kits and all I can say is great job!  I just helped a friend put his small kit together and he is one happy camper."  - William G., High Springs, FL

"I received my mud motor kit a few weeks ago and been using it for trapping muskrats on my trapline for the last 2 weeks.  I have to admit I'm really impressed about it and really enjoy it. Next week I'm taking my trapper neigbours out for a spin. He is interested in acquiring one also."  - Steeve L., Timmins, Ontario

" I still use my kit.  It was one of the early ones and ya know what? I have not had a single problem with it ".  - William G., West Monroe, LA

"I can't thank SPS enough for such great products. Superior products at affordable prices.  Thanks." - Rocky B., Wilsonville, AL

"I was finally able to get out on the lake to try out the new motor and wanted to let you know I was elated with the performance and ease of use, but first let me give you a little back ground. Several years ago I test drove a #### brand motor a friend of mine was wanting to sell and after a weekend of running the motor I decided it was not for me as I was constantly fighting to keep the prop in the water and just had an all-around bad experience. This left a lasting impression on me as far as mud motors were concerned, and I decided to keep repairing my outboards a while longer until my last motor finally gave up and disintegrated the lower unit. I started researching mud motors online and found the Swamp Runner website; after several forum searches and questions I could not find anyone that had purchased one of your units with anything bad to say, so I decided to give it another shot and I’m more than happy I did. Thank you for offering an exceptional product at a reasonable price." - David M., Spartanburg, SC

"Received my medium Swamp Runner kit and mounted it up on my 15hp Honda clone. I think this is probably the first mud motor running around the North Coast of British Columbia - no one seems to know what they are yet. I own a jet boat but this thing is a ton more fun to cruise up the rivers with. The looks you get from other river boaters when they see the longtail prop motor chugging up river through 6'' of water is priceless. Thanks again!" - Tyler S., Terrace, BC

"Just wanted to say how much I love my new Swamp Runner, it has transformed my boat. I just can't say enough good things about the Swamp Runner, the quality of the parts and how economical it is to get on the water. After using it, nothing else can compare." - Chris R., Baltimore, MD

work for a company in northern Utah specializing in close tolerance, precision machining. I recently bought a Swamp Runner Medium Size Kit to use for hunting and fishing. I am very impressed with your product. The materials you use for your product seem to be top notch. As one of your customers, I greatly appreciate your honesty and integrity in selling only the best products. This fall I was able to run your medium sized mud kit on our boat. I can honestly say that I am very impressed with motor. Some days I thought we were pushing it to its limits through the amount of mud and stumps we were running it through but it held tough and showed no signs of wear. We were always able to get to our favorite fishing location or the best duck hunting spot with absolutely no worry about transportation. Thank you for supplying a product that is honest and durable. " - Morgan A., Logan, UT

"I purchased a medium kit a little over a year ago. Just wanted to start by thanking y’all for all the help. This kit was great quality and extremely easy to put together. I put it on a 12ft Waco craft with pods welded to the back. With me, my wife, little boy, and Boykin spaniel, it still pushes the boat 14 mph! So not only a great product, but great customer service! Y’all are awesome!" - Brad J., Easley, SC

"Thank you for making a great product.  I've had the Swamp Runner for about 6 years now and have put a ton of fish and ducks in the boat." - Dennis T., Citra, FL