1977 BMW R100RS Replace Engine Electrical Components, Refurbish Starter Motor

I’ve been making good progress on this project. I’ve finally finished writing up the major engine electrical component replacement and refurbishing the starter motor. You can find this material here.

Where the procedure is similar or identical to work I’ve done on other bikes, I link to the existing write-ups and document the condition I found on this bike.

The body work should be back from the painter soon and the hard bits got dropped off for powder coating Tuesday. The clutch was shipped to Southland Clutch yesterday. I’ve got at least one source for anodizing the brake calipers. So a lot of the “outsourced” work is in progress.

Here are a couple pictures from these write-ups.

Engine Electrical Components

Wires on Back of Diode Board Wires on Back of Diode Board

Unsoldering 3-Phase Wires from Terminal Block Unsoldering 3-Phase Wires from Terminal Block

New EME Stator
New EME Stator

Diode Board, Alternator and Wiring Installed
Diode Board, Alternator and Wiring Installed

Dyna III Electronic Ignition

Points Housing Full of Crud
Points Housing Full of Crud

ATU is Rusty
ATU is Rusty

ATU Main Components Disassembled
ATU Main Components Disassembled

Old Advance Springs Installed on Cam Plate Pins to Limit Full Advance
Old Advance Springs Installed on Cam Plate Pins to Limit Full Advance

Dyna III Sleeve and Pickup Plate Installed in Points Housing
New Dyna III Sleeve and Pickup Plate Installed in Points Housing

Starter Motor

Rusty Starter Motor with Cob Webs
Rusty Starter Motor with Cob Webs

Cracked Insulation on (+) Battery Cable; "Red" Wire Wrapped with Electrical Tape
Cracked Insulation on (+) Battery Cable; “Red” Wire Wrapped with Electrical Tape

Field Coil Housing Removed Showing Armature
Field Coil Housing Removed Showing Armature

Brush & Coil Spring Detail in Brush Holder
Brush & Coil Spring Detail in Brush Holder

Painted Starter Motor
Painted Starter Motor

4 thoughts on “1977 BMW R100RS Replace Engine Electrical Components, Refurbish Starter Motor

    • Hi Rob,

      Yes, this is an “interesting” bike. I wish I had access to all the previous owners to get some history on it. It has a series of changes from the original configuration which I keep discovering as I proceed.

      Best.
      Brook Reams.

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