Technical Information

   
   

FACTORS TO CONSIDER WHEN MATCHING YOUR ENGINE WITH A SWAMP RUNNER™ KIT

 

Bolt Circle Diameter

Most horizontal shaft engines have four tapped holes on the engine side cover, that are located in a circle around the output shaft. These bolt circle mounting holes are a key feature of most horizontal shaft motors.  Be sure the motor you purchase has them if you plan to use our kit.  Use the diagram to the right to properly measure your engine’s bolt circle diameter 

 

How do you know if your motor has the required mounting holes?

Look at where the output shaft is on the motor.  Then, notice that there are two holes above, and two holes below the shaft.  They will be located on an imaginary circle and centered on the output shaft.  Measure the distance between the center of the holes that are opposite from each other, and you will have your bolt circle diameter

 

WHICH KIT FOR MY ENGINE?

ENGINE/KIT MATCHING TABLE

 

MINI
Swamp Runner

SMALL
Swamp Runner

MEDIUM
Swamp Runner

 LARGE
HONDA/BRIGGS
V-TWIN
Swamp Runner

LARGE KOHLER 
V-TWIN
Swamp Runner

ENGINE HP RANGE

2.5 TO 3 hp 

3.5 to 7 hp

8 to 16 hp

16 to 23 hp 

20 to 27 hp

CRANKSHAFT
DIAMETER

5/8 inch
15.875 mm

3/4 inch
19.05 mm

1 inch
25.4 mm

1" or 1 1/8"
25.4 or 28.575 mm 

1 1/8" (1.125")
28.575 mm

CRANKSHAFT
KEYWAY SIZE

3/16" to 1/4"
5 to 6 mm 

3/16" to 1/4"
5 to 6 mm

¼ inch
6 mm

1/4 inch
6 mm 

1/4" 
6 mm

ENGINE SIDE COVER
BOLT CIRCLE
DIAMETER

3 5/8 inches
92.08 mm 

3 5/8 inches
92.08 mm

5 inches
127 mm

5 inches
127mm 

5.625"
142.88 mm

ENGINE
MOUNTING BASE 
BOLT PATTERN

6 3/8" X 3 1/8"
162mmX80mm

6-3/8” X 3-1/8” 
162mmX80mm

7 11/16” X 3 3/4”
195.26mmX95.25mm

 7 11/16" X 4"
195.26mmX101.6mm

7.250" X 3.504"
184.15mmX89mm

 

*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.