BMW (Airheads 1974-1995) Shifting Cam Metal Roll Pin Upgrade

A simple and inexpensive upgrade for smoother shifting is by changing the old white plastic roll pin for a metal BMW K-Series roll pin. It's good practice to change all the return springs at the same time. See below for part numbers. 

Here are the part numbers for the roll pin and springs; Metal Roll Pin: 23 31 1 451 087 Roll Pin Cir-clip: 07 11 9 934 034 Gear Change Spring: 23 31 1 231 618 Shank Spring: 23 31 1 242 910 Gear Chang Spring: 23 31 1 234 791

Here are the part numbers for the roll pin and springs;

Metal Roll Pin: 23 31 1 451 087
Roll Pin Cir-clip: 07 11 9 934 034
Gear Change Spring: 23 31 1 231 618
Shank Spring: 23 31 1 242 910
Gear Chang Spring: 23 31 1 234 791

By now you should know to take photos when taking things apart. I always leave the gears in first gear when disassembling, see picture. During assembly make sure it looks like the picture above (first gear)... or you'll have a hell of a time...

By now you should know to take photos when taking things apart. I always leave the gears in first gear when disassembling, see picture. During assembly make sure it looks like the picture above (first gear)... or you'll have a hell of a time...

The roll pin is currently in first gear.

The roll pin is currently in first gear.

This is what the new K-Bike metal roll pin looks like along with a new (1975 on) gear change return spring.

This is what the new K-Bike metal roll pin looks like along with a new (1975 on) gear change return spring.

Both new gear change return spring and shank spring installed.

Both new gear change return spring and shank spring installed.