The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: jamestnewsonr65 on May 16, 2017, 07:43:23 AM

Title: Fork part identification / clarification
Post by: jamestnewsonr65 on May 16, 2017, 07:43:23 AM

Hey, i'm hoping someone who knows better than me can identify / clarify if these dissasembled fork parts look like they were installed in the right order.

A little bit of background.. I've purchased an r80 and these forks were on the bike, but as i'm refurbishing the bike I am rebuilding the forks.

After looking at the Clymer manual I can not seem to find out which type of forks these are (from the internals) as they don't seem to match and of the parts diagrams.

There seems to be no o'rings in the top of the fork and the white piece of spacer doesn't look original.

Any pointers on whether this looks correct is much appreciated.

(The parts are in sequence as they were removed from the fork)

Title: Re: Fork part identification / clarification
Post by: Barry on May 16, 2017, 01:47:48 PM

The damper rod has everything in the right order for certain.

Ignoring the screws etc and the damper rod itself,  left to right you have:

Circlip
shim to eliminate axial play in the damper valve body
damper valve body
damper valve washer
valve plate
topping out spring
damper piston seal

It's no different in principle from an R65 damper rod except for the topping out spring in place of a bush and the different type of piston seal.

Spring assembly looks right too in terms of being functional but I don't know if the preload spacer is original.  You can soon determine if the spacer is needed by taking sag  measurements on the finished bike.

Title: Re: Fork part identification / clarification
Post by: Bob_Roller on May 16, 2017, 03:04:29 PM

The PVC spacer was most likely added when fork springs were replaced by a previous owner, with aftermarket springs .

Title: Re: Fork part identification / clarification
Post by: jamestnewsonr65 on May 17, 2017, 10:54:39 AM

Thanks for the info. I think the PVC spacer was throwing me off as I couldn't find any reference to anything alike in the parts diagrams.

Title: Re: Fork part identification / clarification
Post by: Tony Smith on May 17, 2017, 04:07:53 PM

Quote

The PVC spacer was most likely added when fork springs were replaced by a previous owner, with aftermarket springs .

K100 forks have a spacer very similar to the one pictured, I understand that they are (or at least were) available in different lengths).

Title: Re: Fork part identification / clarification
Post by: marcmiller001 on May 19, 2017, 09:52:59 AM

Progressive springs use a pvc spacer like that. They are likely aftermarket springs.

Title: Re: Fork part identification / clarification
Post by: BPT on May 19, 2017, 09:57:36 AM

Or could the pvc been added to tighten up existing springs (and/or compensate for them being worn out)?