Kit Size

The Mini Swamp Runner Kit was designed to be light (30lbs) while providing a solid mud motor for smaller boat setups.

This kit will fit most 2.5 to 3 hp engines, with most of our customers using this Mini kit on layout boats, canoes, kayaks, pirogues, sneak boxes, and small skiffs.

These are the engines that fit the Mini Kit:

MakeHPModels
Honda3hp (98cc)GX100QA2
Carroll Stream - Engine2.5hp (79cc)CS152
Harbor Freight - Predator Engine3hp (79cc & 99cc)
69733 & 68124
Home Depot - Lifan Engine3hp (97cc)LF152F-3Q
LCT3hp (79cc & 98cc)CMXX 79cc & CMXX 98cc
Surplus Center - Powerpro Engine2.5hp (79cc)2549-0042

*The information in this table is provided by MudMotorKit.com 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.

The Small Swamp Runner Kit was designed to be the go-to motor for small boats.

This kit will fit numerous 3.5 to 7 hp engines, with most of our customers using this Small kit on flat-back canoes, gheenoes, 8-12ft lightweight jon boats, pirogues, layout boats, poke boats, and sneak boxes.

This kit weighs a total of 48 pounds (engine not included).

These are the engines that fit the Small Kit: 

MakeHP/ccModels
BE Powerease7hp (210cc)85.570.070
BPS6.5hp (196cc)Chinese clone
Briggs - Vanguard6.5hp (196cc)
6.5hp (205cc)
6.5hp (208cc)
Many 550 thru 950 Series, Intek, Vanguard & other models too numerous to list.
Measure your engine using the Engine Requirements listed below this table.
Carroll Stream Engines5.5hp (163cc)
6.5hp (196cc)
7hp (212cc)
5.5hp: CS165 & CS168ES
6.5hp: CS168 & CS168ES
7hp: CS170,
Champion4.3hp (196cc)100118
Ducar6.5hp (196cc)
6.5ph (212cc)
Chinese clone
Harbor Freight: PredatorAll 6.5hp (212cc)#60363, #69730, #69727
Home Depot: Lifan6.5hp (196cc)LF168F-2BQ, LF168F-2BDQ
Honda5.5hp GX160 (160cc)
6.5hp GX200 (196cc)
Numerous engines with a "Q" Type shaft
Identified by a "Q" in the last 4 digits of the model number
A few examples:
5.5hp: GX160UT1QX2, GX160UT1QXP2, GX160UT1QXC9
6.5hp: GX200UTXQ2, GX200UT2QX2, GX200UT2QG2
LCT5hp (179cc)
5.5hp (208cc)
6hp (223cc)
CMXX 179
CMXX & MAXX 208
CMXX 223
Kohler6.5hp (196cc)
7hp (208cc)
6.5hp: SH265-0011
7hp: CH270-0103, CH270-3011, CH270-3031, CH270-3105
Titan6.5hp (196cc)
TX200S
Duromax?hp (212cc)
XP7HP, XP7HPE
While these Durmax models will fit our kit, we do not recommend them because customers have had too much trouble with them.

*The information in this table is provided by MudMotorKit.com 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.

The Medium Swamp Runner Kit was built to fit single cylinder engines from 8hp to 16hp.

These engines have a noticeable increase in torque from the engines that fit the Small kit.

This increase in torque allows you to plow through heavier vegetation and mud a lot easier.

Most of our customers use this Medium kit on jon boats 13 to 14 feet long.

This kit weighs a total of 58 pounds (not including engine).

These are some of the engines that fit the Medium Kit:

MakeHPModels
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)
CS182
CS188
CS190
Harbor Freight: Predator Engines8hp (301cc)
11hp (346cc)
13hp (420cc)
62553, 62554
68136
60340, 60349, 69736
Home Depot: Lifan Engines13hp (389cc)
15hp (420cc)
LF188F-BDQ
LF190F-BDQ
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:
GX240UT2QAE2, GX240UT1QAE2
Honda9hp GX270 (270cc)GX270UT2QA2, GX270UTQAE2, GX270UTQXC9
Honda11hp GX340 (340cc)GX340UT2QA2, GX340UT2QNE2
Honda13hp GX390 (390cc)GX390UT2QAA2, GX390UT1QNE2, GX390UT2QXC9
Duromax ?hp (420cc)
?hp (440cc)
XP16HPE
XP18HPE
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 MudMotorKit.com 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.

The Large Swamp Runner Kit has the ability to fit many different engine types and sizes.

After many years of testing and hearing back from customers, we recommend the Predator 22hp or Briggs Vanguard V-Twin engines.

The Large kit weighs 75lb and will fit up to a 23hp V-Twin engine. Look below for engine compatibility.

Longtail mud motors like skinnier hulls. We DO NOT recommend putting a longtail on a boat with a bottom width greater than 48″.

Transom heights higher than 16″ are also less than ideal.

Most of our customers put this Large kit on boats varying in size from a 1542 with a 23hp v-twin up to lightweight 18′ boats.

These are some of the engines that fit the Large Kit:

MakeHPModelsSpecial PTO Shaft
Briggs-Vanguard16hp (479cc)
18hp (570cc)
21hp (627cc)
23hp (627cc)
16hp: 305447-0075, 305447-3075;
18hp: 356447-0075, 356447-0079;
21hp: 385447-0075;
23hp: 386447-0020, 386447-0047, 386447-0065,
386447-3065, 386447-0079
1"
Briggs-Vanguard16hp (479cc)
18hp (570cc)
23hp (627cc)
16hp: 305447-0087
18hp: 356447-0087
23hp: 386447-0048
1.125"
Carroll Stream20hp (6cc)CS2V77
CS2V77R
1", 1.125"
1", 1.125"
Harbor Freight Predator22hp (670cc)616141"
Home Depot: Lifan24hp (690cc)LF2V78DT1.125"
Honda18hp
20hp
GX610 with 1" diameter "Q type" output shaft
GX620 & GX630 with 1" diameter "Q type" output shaft
1"
Honda24hp (688cc)GX660 & GX690 with 1 1/8" diameter "Q type" shafts1.125"

*The information in this table is provided by MudMotorKit.com 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.

This is the Large Swamp Runner Kit designed to fit Kohler V-Twin Engines.

The Large kit weighs 75lb.

Longtail mud motors like skinnier hulls. We DO NOT recommend putting a longtail on a boat with a bottom width greater than 48″.

Transom heights greater than 16″ are also less than ideal for a longtail.

Most of our customers put this Large kit on boats varying in size from a 1542 with a 16hp v-twin up to 18′ boats.

*The information in this table is provided by MudMotorKit.com 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.

This is the Large Swamp Runner Kit but is designed to fit Subaru V-Twin Engines.

The Large kit weighs 75lb.

Longtail mud motors like skinnier hulls. We DO NOT recommend putting a longtail on a boat with a bottom width greater than 48″.

Transom heights greater than 16″ are also less than ideal for a longtail.

Most of our customers put this Large kit on boats varying in size from a 1542 with a 16hp v-twin up to 18′ boats.

*The information in this table is provided by MudMotorKit.com 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.

The Big Block Large Swamp Runner Kit has the ability to fit the biggest engine Briggs Vanguard makes (40hp).

After many years of testing and hearing back from customers, we recommend the Briggs Vanguard V-Twin engines.

The Big Block V-Twin Large kit weighs 75lb and will fit most Briggs Vanguard engines from 25hp up to a 40hp V-Twin engines.

You will need to install an oil filter adapter to the V-Twin Briggs Vanguard Engines to allow a proper fit for the Swamp Runner kit.

Longtail mud motors like skinnier hulls. We DO NOT recommend putting a longtail on a boat with a bottom width greater than 48″.

Transom heights greater than 16″ are also less than ideal for a longtail.

Most of our customers put this Big Block Large kit on boats varying in size from a 16′ to 24′ boats.

*This information is provided by MudMotorKit.com 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.

Shafts:

Shaft Length

The 75″ shaft was designed for the Mini kit and is only offered for the mini kit.

It will NOT fit any other kit.

The 85″ shaft is recommended for boats with a maximum bottom width of 40 inches.

This covers most Small kit and Medium kit applications.

Go with the 100″ shaft if one or more of the following is true:

  • The bottom width of your boat is greater than 40″ or your transom is higher than 16″.
  • You plan to go faster than 25 mph.

 

The 100″ shaft is the go-to size for boats that have a bottom width greater than 40″ but less than 48″.

This means anything from a 1442 or 1542 to a 1648 or 1848.

The 100″ shaft is also for those with a smaller boat going over 25 mph. At this speed, you start to outrun your wake with an 85″ shaft. The 100″ shaft gives you that extra reach and a little more tail weight to keep the prop in the water.

The 100″ shaft is offered with our Medium and Large Kits.

We DO NOT recommend putting any longtail motor on a boat with a bottom width greater than 48 inches

The 110″ shaft is meant for boats that are around that 48″ bottom width and/or exceed 30 mph.

This is for bigger boats like a 1848 or a 2448 with a big 35hp or 40 hp engine.

We DO NOT recommend putting any longtail motor on a boat with a bottom width greater than 48 inches even with this 110″ shaft.

Call to order. The 110″ & 120″ have to be shipped by freight.

The 120″ shaft is meant for boats that are around that 48″ bottom width and are going faster than 30 mph.

This is for bigger boats like a 1848 or a 2448 with a big 35hp or 40 hp engine.

We DO NOT recommend putting any longtail motor on a boat with a bottom width greater than 48 inches even with this 120″ shaft.

Call to order. The 110″ & 120″ have to be shipped by freight.

Shaft Flavor

The Standard shaft is meant to keep prices low while still maintaining a high level of quality and reliability.

Key Features: Hardwood bushings + High carbon steel inner shaft

Hardwood bushings are preferred by the racers in Thailand, because of their durability and heat resistance.

With proper maintenance and care, this shaft will last many, many years.

The Extreme Duty shaft is the next step up from the Standard shaft.

Key Features: Bayou Bushings throughout + high carbon steel inner shaft

The Standard Shaft has hardwood bushing throughout the shaft to help support the inner shaft to keep it straight will rotating 1,000’s of times per minute.

This Extreme shaft features our propriety Bayou bushing where the hardwood bushings are replaced with our Bayou bushings.

This means decreased maintenance and better longevity of your shaft.

 

The Extreme Duty Saltwater Series is the next step up from the Extreme Duty shaft.

Key Features: Bayou Bushings throughout + stainless steel inner shaft

The main difference from the Extreme Duty to the Extreme Duty Saltwater Series is the inner shaft.

The Extreme Duty shaft has a high carbon steel inner shaft.

The Saltwater Series has a stainless steel inner shaft.

Both the Extreme and Saltwater shafts feature our propriety Bayou bushing.

With a stainless steel inner shaft outfitted with all Bayou Bushings, this requires minimal maintenance when compared to the other shaft flavors.

 

The racing shaft features a longer taper that will fit only our racing props. No other shaft has enough taper to fit the racing props.

The Racing shaft can come in any of the flavors offered: Standard, Extreme Duty, Extreme Duty Saltwater Series.

Racing shafts will not accept standard props or performance props.

Special order – you must call to order Racing Kits or Racing Shafts.

Tiller Handle

The straight tiller handle comes standard with the Mini kit.

A straight tiller handle works best with very small boats, canoes and pirogues with open cockpit and low freeboard.

The straight tiller handle has the potential to bottom out on a seat when the prop is lifted out of the water.This is especially true with the current style of riveted jon boats. That why we offer the offset tiller handle.

The offset tiller handle comes standard with the Small, Medium, and Large kits.

Our offset tiller handle has six different adjustment holes which allows you to customize and lock the position of your tiller handle. 

This also allows you to adjust it for operating while sitting or standing. You choose!

Built ambidextrous. No matter whether you’re left or right-handed, ride on.

At times, Swamp Runner gets an inventory of unique tiller handles. If we receive other tiller handle options, it will be listed in the Build Your Kit page and put in the Parts Shop.

Additional Engine Parts

If you decide to go with a Honda engine, you will need a throttle parts bag.

This includes a cable swivel stop and cable crimp so you can easily hook up Honda throttle linkage.

Most Briggs/Vanguard, Predator, clone engines already come equipped with this hardware.

Prop Selection

Standard props are made of aluminum.

They have a standard pitch and ride very smoothly.

Fits all shafts EXCEPT Racing shafts.

We have size recommendations on each kit page, on each prop page, and on our Longtail Props Page.

 

Our stainless props are constructed of 304 stainless steel.

They are available in both standard pitch and weedless versions.

Fits all shafts EXCEPT Racing shafts.

We have size recommendations on each kit page, on each prop page, and on our Longtail Props Page.

 Using a stainless steel prop will void the lifetime warranty on coupler housings and coupler shafts.

Our weedless props are available in both aluminum and stainless steel.

They have a negative rake to clear vegetation more efficiently and ride very smoothly through the water.

 Our weedless props are heavier built than our standard props, so they tend to be more durable.

Fits all shafts EXCEPT Racing shafts.

We have size recommendations on each kit page, on each prop page, and on our Longtail Props Page.

 

Hurricane props are made of aluminum.

They have an increased pitch to maximize speed without increasing prop size diameter.

Fits all shafts EXCEPT Racing shafts.

We have size recommendations on each kit page, on each prop page, and on our Longtail Props Page.

 

Bullet props are made of aluminum.

The Bullet props have even more pitch than a Hurricane prop to really maximize speed without increasing prop size diameter.

Fits all shafts EXCEPT Racing shafts, and require a very light weight boat with a high torque engine.

We have size recommendations on each kit page, on each prop page, and on our Longtail Props Page.

 

Racing props are made of aluminum.

They are designed just for racing, and are recommended only for ultra light weight boat with high horsepower engines.

Only fits Racing shafts. Does NOT fit standard shafts.

We have size recommendations on each kit page, on each prop page, and on our Longtail Props Page.

 

Tips/Guides

The Prop Puller is THE tool to have on the boat for a longtail mud motor.

This makes changing out props a lot easier.

We highly recommend getting this tool, especially if you’re going to be experimenting with different props.

 

Having an additional prop nut can really save you while out on the water.

If you find yourself out on the water changing out a prop and lose the prop nut, that makes for a difficult time getting back to the ramp. If this does happen, you can use another prop to slide behind the new prop you are installing, tap the old prop while holding it against the new prop to force the new prop onto the tapered shaft. If it holds pretty good, start the engine, put it in the water, and get up on plane. The prop should stay on till you get back to the ramp.

Pro Tip: get an extra prop nut when you order your kit.

Have an extra prop on the boat just in case you break one.

Figure out which props you like and what runs well on your rig, and then order all of them in one go to save on shipping.

Every kit sold comes with a digital copy of the Owners Manual. This allows you to read over the manual and get to know your kit before it shows up at your door. This also gives you the opportunity to purchase any additional hardware and allows you to make sure you have the proper tools for assembly.

While being able to take access your digital copy from anywhere, and being able to use your smartphone or tablet out in the garage to assemble your kit, we understand some customers like having a physical printed copy so we give you the option on the kit customization page to choose.

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