Vintage BMW Motorcycle Owners

Posted: **Mon Sep 06, 2021 5:37 pm**

Does anyone know what the pad thickness on both ( selector side and cog side) ends of is supposed to be on a 4 speed shift fork?
Thanks. Frank.
NYC

Posted: **Wed Sep 15, 2021 6:01 pm**

Not sure what you mean but if you post a picture or something I can check mine as it is apart now.

Posted: **Sat Sep 18, 2021 12:01 pm**

I measured the one I had on hand. Slider side 5.81 mm and 5.83 mm, pretty close for a 55 year old part. Selector side 7.93 mm on what I will call the “major” diameter, this end has a definite curvature.

Posted: **Sat Sep 18, 2021 3:23 pm**

While I don't have my box apart just yet, this is a subject that interests me.

What I would like to know.

What is the clearance between the selector fork and the groove it runs in ideally meant to be?

Mal

Posted: **Tue Sep 21, 2021 10:07 am**

Mal, Great question. My guess is that the slider is about 6mm. I don’t have one to check. It’s really the “twist” of the fork in the slider that seems to matter. There is a transmission article in the Winter 2021 Issue (I know who wrote it

). I suggest changing over to the eccentric shift fork bushings as found on the /5; lots of material on the web about that.

Posted: **Tue Sep 21, 2021 4:26 pm**

chrishea wrote: ↑
Tue Sep 21, 2021 10:07 am
Mal, Great question. My guess is that the slider is about 6mm. I don’t have one to check. It’s really the “twist” of the fork in the slider that seems to matter. There is a transmission article in the Winter 2021 Issue (I know who wrote it ). I suggest changing over to the eccentric shift fork bushings as found on the /5; lots of material on the web about that.

Thank you for the response.

I will look the article up.

Cheers

mal

Vintage BMW Motorcycle Owners

Shift fork size

Shift fork size

Re: Shift fork size

Re: Shift fork size

Re: Shift fork size

Re: Shift fork size

Re: Shift fork size