Medium Swamp Runner Kit (8-16hp)

From: $549.00

Our Medium Swamp Runner Kit is designed for 8-16hp engines and is perfect for medium size jon boats up to 14 feet.

Kit Weight: 57 lbs.

The Predator 420 (13hp) & Honda GX390 are the most used engines with this kit. Please use the tab below for more compatibility details.

SKU: 30kt00m Category:

Our Medium Swamp Runner Kit includes every part needed to build a longtail motor except for the engine.

Each kit includes:
  • Coupler Assembly
  • Tethered Kill Switch Assembly & Adapter
  • Tiller Handle
  • Duckbill Throttle Assembly & Grip
  • 85" Shaft Assembly or 100" Shaft Assembly
  • Engine Base Mounting Bracket
  • Transom Bracket
  • All hardware required for assembly.
  • Comes standard with (2) Aluminum Surface Piercing Propellers. One 8.5" standard prop and one 8.75" weedless prop.
  • Owner's Manual for assembly instructions and other information


Additional Info

You can view performance stats submitted by verified Medium Swamp Runner Kit owners at the link below.
Customer Performance Stats -
This will show the engine sizes the medium kit was installed on, the type of boat, along with the weight, speed, propeller, and RPMs reached.

Most people put the SPS Swamp Runner Medium Kit (57lbs) with the 13hp Predator Engine (73lbs) - This setup will total 130-lbs.

You could also use a 16hp Vanguard V-twin engine that we sell on mudmotorkit.comFor example, User: durandbagwell86 reached 36-mph in a 15' wooden jon boat with a modified 420cc engine spinning 7200 RPMs with the 8" stock prop.
However, most customers use a stock 420cc predator engine and put it on a 1436 jon boat to achieve a speed of around 16 mph with a full load and 20+ mph with one person and a light load.
The 1436 riveted jon boat is the most widely used boat for this kit.

If you want more power, the next step up is the SPS Large Swamp Runner Kit (75lbs) which is normally paired with a 22hp Predator engine (106lbs) totaling 181 lbs. OR paired with a 23hp Vanguard that we sell here on

Customer Videos -

  • YouTube -

Our Medium Swamp Runner™ kit will fit a variety of engines between 8 & 14hp.  So many in fact, 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:

Briggs - Vanguard8hp (305cc)
13hp (408cc)
16hp (479cc)
There are simple too many Briggs / Vanguard engines made over the years to list.
Measure your engine using the Engine Requirements listed below this table.
Carroll Stream Engines11hp (337cc)
13hp (389cc)
16hp (420cc)
Harbor Freight: Predator Engines8hp (301cc)
11hp (346cc)
13hp (420cc)
15.8hp (459cc)
62553, 62554
60340, 60349, 69736
58818, 58383
Home Depot: Lifan Engines13hp (389cc)
15hp (420cc)
Honda8hp GX240 (240cc)Numerous engines with a "Q" Type shaft
Identified by a "Q" in the last 4 digits of the model number
A few examples:
Honda9hp GX270 (270cc)GX270UT2QA2, GX270UTQAE2, GX270UTQXC9
Honda11hp GX340 (340cc)GX340UT2QA2, GX340UT2QNE2
Honda13hp GX390 (390cc)GX390UT2QAA2, GX390UT1QNE2, GX390UT2QXC9
Duromax ?hp (420cc)
?hp (440cc)
While they will fit our kits, we do not recommend Duromax engines.
Too many of our customers have had problems with them.

*The information in this table is provided by as a courtesy service to our customers, and should only be used as a guide to help you choose a kit and match your engine with it. We could not possibly list information that would apply to all engines that are available and will fit our kits.  While every effort has been made to provide useful information, the information may change.  So, it is your responsibility to verify engine specs with the manufacturer of your engine prior to ordering.

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 (25.4mm) diameter (non-tapered) with keyway.
  • The engine side cover bolt circle diameter must be: 5 inches (127mm).
  • Engine base bolt pattern must be: 7 11/16” X 3 ¾” (195.26mm X 95.25mm)

*Make certain you check the manufacturer’s specifications for your intended engine to ensure proper fit. The shaft size, engine base, and bolt circle patterns must match. The cost of return shipping is the responsibility of the buyer. We do our very best to provide a detailed and accurate description of our products. If you have any questions, please do not hesitate to call and ask before purchasing.

NOTE: The Carroll Stream 9hp engine, all engines with tapered or threaded PTO shafts & engines with gear reduction box options are not compatible with this kit.

Swamp Runner®
by SPS
Beaver Dam
Heavy-duty steel Coupler Housing is zinc plated, then powder coated for superior corrosion protection.
Cast Aluminum
Coupler Housings, Coupler Shafts, and Coupler Sleeve Joints so tough they come with a LIFETIME WARRANTY against cracking or breaking to the original owner.yesnono
Coupler shafts of Small, Medium & Large Kits ride smoothly on high quality Japanese radial bearings. yesnono
Offers longtail shafts featuring premium Bayou Bushings, a low friction proprietary bushing developed by Swamp Runner, and capable of withstanding extreme high temps without melting. Over 1000 hrs in a test tank with negligible wear. This bushing just doesn’t care what you throw at it.yesnono
Longer tiller handle designed to operate while standing up or sitting down, with position holes drilled in the handle, and locking bolts that prevent the handle from twisting in the mounting rings. yesnono
Squeeze type throttle lever that has the full throttle travel of your engine.yesnono
Stainless throttle cable that resists corrosion.yesnono
High quality sealed Japanese bearings in the gimbal mount for smooth, fluent handling of the longtail mud motor.yesnono
Gobs of shaft options to choose from: 5 different longtail shafts lengths varying from a 75" to 120" in length, Along with 4 different shaft options; Standard, Extreme Duty, Saltwater Extreme Duty, and Racing shafts.yesnono
Loads more propeller options than any other mud motor company. With more than 50 different props available including standard props, weedless props, performance props, stainless props, racing props, and even props that come with a .25" bore so you can tap it yourself!yesnono
The Weedless Skeg on Small, Medium and Large kits has a longer entry angle that repels vegetation and slides over logs easier.yesnono
First & only Thai longtail company to offer a Weed Cutter option that can be bolted directly to the weedless skeg using predrilled mounting holes.yesnono
A full time mud motor company offering knowledgeable support from over two decades of experience with Thai longtails in both Thailand and the USA.
Access to an active forum where customers enjoy learning about their longtail, and interacting with other owners and people who KNOW Thai longtails.
Access to numerous parts you can't get anywhere else.

Additional Information

Weight 40 lbs
Dimensions 23 × 19 × 7.5 in


27 reviews for Medium Swamp Runner Kit (8-16hp)

  1. Jason (verified owner)

    Best investment for my company ever!

  2. Ron P (verified owner)

    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!

  3. Ed (verified owner)

    I just wanted to give you a follow up on the mud motor kit… IT IS AWESOME! It got us 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….

  4. Donnie J (verified owner)

    I recently bought one of your Medium Series mud motor kits and it’s awesome! I took it to the Mississippi River 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.

  5. Darrin (verified owner)

    Assembly was easy, I had one question early on, called and they were extremely helpful, and friendly. Took it out for a test run, ran flawlessly. I did have one small issue on a grease fitting, snapped off when greasing. Easy fix! Would buy 10x over!

  6. Jesse N (verified owner)

    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. Now I’ve seen four people running this 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.”

  7. Richard H (verified owner)

    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 helped 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.

  8. Chance G (verified owner)

    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.

  9. Ronnie B (verified owner)

    This kit went together well and preformed great on my 1436 Jon boat.

  10. Justin T (verified owner)

    Hands down the best purchase I’ve made for my 1436 jon boat. Gets me up river faster then my old outboard ever could, and I don’t have to worry about getting out to pull my boat through the shallows. 10/10 would recommend this to anyone wanting to upgrade their motor

  11. Dustin B (verified owner)

    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.

  12. Austin F (verified owner)

    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. 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 and truck. Got any extra stickers?”

  13. David M (verified owner)

    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.

  14. Tyler S (verified owner)

    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!

  15. Bill C (verified owner)

    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.

  16. Steve L (verified owner)

    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 upgrades 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.

  17. Steve L (verified owner)

    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.

  18. William G (verified owner)

    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

  19. Chris R (verified owner)

    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.

  20. Dennis T (verified owner)

    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.

  21. Rocky B (verified owner)

    I can’t thank SPS enough for such great products. Superior products at affordable prices. Thanks

  22. Morgan A (verified owner)

    I 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

  23. Brad J (verified owner)

    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!”

  24. FL_CrackerLife_1986 (verified owner)

    After a lot of research, I decided to go with the SPS Medium kit, setup with a Predator 420cc. I can honestly say that this setup has surpassed all of my expectations as longtail mud motors go, its simplicity and ease to work on are great.
    Thanks for a Great product, and the online support is greatly appreciated.

  25. Max M. (verified owner)

    I put this on my 1448 SeaArk. Could not being happier. Put a predator 420cc engine with the kit and I get about 15+mph with gear and a buddy. It does take some getting used to but I think I’m hooked on Swamp Runner for life!

  26. Micah I (verified owner)

    Put on my 14,36 jon boat for bowfishing and absolutely love it have yet to get stuck in it and got me out when I was bottomed out. Only thing I don’t like which is not the big of a deal is that the handle needs to be tied down otherwise the tail falls straight down in the water. other than that high quality product and fits perfect on a 420cc predator motor!

  27. Jonathon Strubel (verified owner)

    I bought this and installed it with no problems. It’s mounted on a 14′ aluminum boat with a flat bottom in back but a v hull in the bow. Transom is wider than recommended for the shaft length but it still moves. It’s not the ideal boat for this motor but it works. I have taken it on the Missouri river and the James river on the SD/NE border. It moves the boat up and down stream no problem. Best horsepower per dollar I know of. It’s so simple and easy to use. I would recommend it and would buy it again.

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