Backwater Motors

Made proudly in the U.S.A.


Service Tips


Briggs Owners Manuals

36 Vertical Vanguard Operators Manual

35 Horizontal Vanguard Operators Manual

37 EFI Horizontal and Vertical Vanguard Operators Manual

Large and Small Vanguard 23 and 35 Repair Manual

37EFI Vanguard Repair Manual

Illustrated Parts Manual 35 Vanguard

Illustrated Parts Manual 37EFI





HDR Transmission Main Seal Replacement Guide.

These instructions provide you step by step procedures toRreplace the large outer main seal on the HDR transmission.

HDR Seal


HDR Transmission Disassembly and Assembly

These instructions provide you step by step procedures to service and repair your HDR Electric Shift Reverse drive.

HDR Transmission Repair

Trim Switch Upgrade

Upgrade your trim switch to the Mercury trim switch used on most Mercury outboards. Order by calling MB at 801352.8011. $55 includes trim switch and new control box cover. Only used for the Mercury trim units. Instructions

Mercury Switch


Briggs Torque Specs

check your bolts on the mount, drive and engine at 25 hours and then every 100 hours.


New HD Motor Break In and Service

Kent Saxon from Gator Trax does a good job here with tips, break in and service of your new motor.


Mikuni Carb Tuning Manual

Your performance carburator jets are set at the factory for your mud motor. If you run at elevations above 4500 feet you can reduce the main jet by 10 points. Example, if it says 180 on the jet you can use the 170 for a cleaner burn and better power.


Performance Cam Installation

Some customers brave installation of a performance cam in their large block vanguard engines. The BPS cam provides better lift, holds the valve open longer to provide more fuel in and out of the cylinder for better power and load carring ability.


Wire Diagrams

All Mud Buddy motors have a unique wiring diagram for each engine. Here you can see a color wire connection reference for tiller, remote steer, stock and performance engine. If you don't find your diagram here, or have any questions, contact Mud Buddy for more information. 801.352.8011


HD Sport Service Videos



Check belt tension.


Adjusting belt tension.


Assembly and disassembly of the drive.


Break in, greasing etc. courtesy Kent Saxon Gator Trax Boats.