The 1983 R80ST transmission is the same as the 1983 R100RS transmission that I rebuilt previously. So in this document, I provide links to the 1983 R100RS documents showing how I disassemble, rebuild and reassemble the transmission.  I will provide pictures and details about what I find when I open up the R80ST transmission and will document any work I have to do on the R80ST that is different from the work I did on the R100RS.

I have the transmission cases vapor blasted by Colorado Vapor Blasting in Arvada, CO who is generously providing a discount to me in support of my goal of a charity auction of this R80ST to support the Motorcycle Relief Project.

Here is the link to the documentation for the transmission disassembly, rebuild and assembly including pictures of the 1983 R80ST transmission.

• 23 BMW 1983 R80ST Disassemble, Rebuild, Assemble Transmission

Here are pictures of the rebuilt transmission.

Transmission Serial Number-Z078854

Transmission Assembled-Red Tape On Fill Plug Means I Haven’t Put Gear Lube In The Transmission Yet

Transmission Assembled-Rear

Transmission Assembled-Bottom

Transmission Assembled-Front

This document shows how I disassemble a 1983 BMW R80ST “project bike” down to the frame.

• 00 BMW 1983 R80ST Disassembly Down To The Frame

It has links to other documents that describe how to remove various assemblies such as the electrical system, brakes, drive train, engine etc. Although not included in this document, there will be other documents that cover details about the disassembly and rebuilding of some of the components removed in this document; e.g., the master cylinder, disk calipers, wheel bearings, etc.

I got the bike in November 2021 as a project bike. Consequently, a number of parts were not installed on the bike so I won’t be showing how to remove them. Nonetheless, I list the removal of parts in the order that I would have removed them so you can use this document as a guide for removing all the parts from the bike to strip it down to the frame.

As Delivered To Brook’s Airhead Garage

Additional Parts That Had Been Removed

After I finished disassembling it and storing parts in bins, this is what it looks like.

Disassembled 1983 R80ST With Parts In Bins

I converted this 1983 R100RS into an RT by adding the RT fairing. The RT fairing comes with hard plastic side pockets, but they are much too close to the gas tank for my taste.

R100RT Fairing Interior View Showing How Close Plastic Pockets Are To Gas Tank

So, I decided to install a set of cloth bags that provide storage and don’t get very close to the gas tank. I used Fairing Pockets from “Kathy’s Journey Designs”, that are designed to work with the RS fairing.

Kathy’s Journey Design Fairing Pockets Come In Different Colors; Mine Are Black

You can read all about how I did this project here.

• 52 BMW 1983 R100RT Install Cloth Fairing Pockets

I mount the RS fairing pockets on the RT fairing using the existing bushings that the plastic fairing compartments mounts to. There is enough room between that part of the RT fairing and the gas tank that the bags won’t touch the gas tank when they are mounted.

Side Of Fairing Showing Bushings For M6 Bolts Used To Mount Stock Plastic Fairing Compartments: Note Rear Top Bushing Is Shorter Than The Others

I mount the bags using three M6 bolts with a flat and wave washer to the side of the fairing.

Back Of Bag With Three Grommets Installed

Bag Mounting Hardware: M6-10 Bolt, Flat and Wave Washers

M6x10 Bolts Installed Through Grommets In Bag

Bag Mounted On Inside of Fairing Leaving Clearance Next To Gas Tank