51 BMW 1983 R100RS Remove Fork & Seat Locks

The fork lock is mounted to the steering head and the seat lock is mounted in the rear sub-frame. I remove them so I can powder coat the frame and the sub-frame.

Remove Fork Lock

The fork lock mechanism is retained by the lock cover. The pin holding the cover keeps the key assembly in the frame.

Fork Lock with Cover

Fork Lock with Cover

I use a large blade screw driver and put it through the gap between the steering head and the down tubes with the blade against the back side of the cover as near to the cover pin as I can.

Remove Fork Lock Cover

Remove Fork Lock Cover

I use a plastic mallet and hit the screw driver a couple stout wacks to start driving the pin out. As the pin slides out, it becomes easier to bend the cover plate. So once the pin is loose and there is a gap between the cover plate and lock housing, I use a smaller blade screw driver to pry the cover plate pin out of the frame.

Remove Fork Lock Cover

Remove Fork Lock Cover

Fork Lock Cover Hardware Detail

Fork Lock Cover Hardware Detail

Fork Lock With Cover Removed

Fork Lock With Cover Removed

Next, I insert the fork lock key into the lock, turn it while at the same time pushing up on the key a bit to keep it in the lock and pull the key backward. The lock mechanism comes out of the frame attached to the key.

Removing Lock Mechanism-Insert Key

Removing Lock Mechanism-Insert Key

Removing Lock Mechanism-Turn Key Counter-clockwise

Removing Lock Mechanism-Turn Key Counter-clockwise

Removing Lock Mechanism-Pull Lock Out

Removing Lock Mechanism-Pull Lock Out

Fork Lock Removed

Fork Lock Removed

Fork Lock Hardware Detail

Fork Lock Hardware Detail

Remove Seat Lock Assembly

The seat lock assembly is secured to the rear sub-frame with two long screws from the inside of the sub-frame. There is key lock on the outside of the rear sub-frame next to the grab handle.

Rear Sub-frame Has Seat Lock Next To Grab Handle

Rear Sub-frame Has Seat Lock Next To Grab Handle

There is a metal housing holding the seat latch components on the inside of the rear sub-frame.

Seat Latch Mechanism is Inside a Housing on The Inside of the Rear Sub-frame

Seat Latch Mechanism is Inside a Housing on The Inside of the Rear Sub-frame

I remove the two Phillips head screws from the housing.

Remove Seat Latch  Mechanism Backing Plate

Remove Seat Latch  Mechanism Backing Plate

Seat Latch Mechanism Backing Plate Hardware Detail

Seat Latch Mechanism Backing Plate Hardware Detail

Seat Latch Mechanism Backing Plate Detail

Seat Latch Mechanism Backing Plate Detail

Part of seat lock mechanism is inside a shell. The mechanism includes a lever that catches the seat pin locking it down, a lever return spring, and the lever pivot pin that goes through the center of the return spring.

Seat Latch Mechanism Parts Detail

Seat Latch Mechanism Parts Detail

Seat Latch Mechanism Parts Detail

Seat Latch Mechanism Parts Detail

I remove the lever, pivot pin and spring. The pivot pin is secured with a cir-clip on each end of the pivot pin. I remove them using cir-clip pliers.

Seat Latch Lever Pivot Pin C-Clip

Seat Latch Lever Pivot Pin C-Clip

Remove Seat Latch Lever Pivot Pin Cir-Clip

Remove Seat Latch Lever Pivot Pin Cir-Clip

Seat Latch Lever Pivot Pin C-Clip Detail

Seat Latch Lever Pivot Pin C-Clip Detail

After I remove one of the cir-clips, I push the pin out the other side of the shell to remove the spring and the lever.

Removing Seat Latch Lever Pivot Pin

Removing Seat Latch Lever Pivot Pin

Seat Latch Lever Pivot Pin & Spring Assembly Detail

Seat Latch Lever Pivot Pin & Spring Assembly Detail

Seat Latch Pivot Pin Hardware Detail

Seat Latch Pivot Pin Hardware Detail

Seat Latch Arm Orientation

Seat Latch Arm Orientation

Seat Latch Mechanism Parts Detail

Seat Latch Mechanism Parts Detail

I push the button out of the shell.

Seat Latch Push Button Pulls Out

Seat Latch Push Button Pulls Out

The lock fits in a ring that is secured to sub-frame with a small Phillips screw . It has an arm that prevents the lever in the shell from rotating which locks the seat.

Seat Lock Orientation

Seat Lock Orientation

Remove Seat Lock

Remove Seat Lock

Seat Lock Lock Ring Detail

Seat Lock Lock Ring Detail

The lock retaining ring has a triangular section that fits into the triangular space on the lock.

Seat Lock Mounting Detail

Seat Lock Mounting Detail

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