Fork Internals - Type III ??? Two Springs

[Rodeogeo]

Getting after all of the maintenance items on my 82 R65LS caught up (haven't had a job for a few months and have had the bike for 8 years). Forks and head bearings R&R time.
Both Forks had two springs in them. I can't find anything online about an R65LS having two springs like this. The Clymer manual implies that this set up is a Type 3 style that is on larger bikes? Did someone do an aftermarket "upgrade?
Oil was dirty and only one fork had a semi-intact damper ring (split in two) the other just had little bits of black rubber like stuff floating around. The partially intact damper ring was above the short spring and below the valve housing.
I'm inclined to put the damper ring in the stock location, between the washer with holes and the valve washer. The lower short spring terminates in a coil and I think would be hard on the damper ring.
I've attached a photo that hopefully explains this better.
Should I place the damper ring in the stock location?
Additional questions -
No shims came out of the forks and I haven't seen any videos where people put a shim in.
How much oil should I put in? 190ml? I have 7.5W

Spring Dimensions Uncompressed
Upper Spring  - 19.75" (501 mm) long, 1.07" (27.2 mm) coil diameter, spring thickness 0.17" (4.3 mm)
Lower Spring  - 3.0" (76.2 mm) long, 1.10" (27.9 mm) coil diameter, spring thickness 0.125" (3.8 mm)
 

[georgesgiralt]

Hello,
Others will chime in but if you search on this site you will find a lot of discutions pertaining to the fork.
These forks suffered hard noises when clearing a bump and BMW attempted changes to solve this.
You have the latest incarnation of this.
I can't explain what and how you should assemble this as I own a previous incarnation of this fork, but I bet more knowledgeable people will chime in.
IMHO as you have a spring in the "lower compartment" you do not need any shims to lock the parts.
Hope this helps.

[Barry]

What you describe as the upper spring sounds correct.

A stock spring was 490 - 502mm long with 4.25mm wire diameter and 66 full coils of which 7 coils at either end being closely spaced to provide a dual spring rate rate.

These forks were modified over the years and one of the things they did is to install a spring loaded shorter valve body which is what your short spring might be although I would need to see your photo of the valve body to confirm.

That short spring was the same part as other airhead forks used as a topping out spring. In this case the short spring was between the valve plate and the underside of the damper piston to cushion the shock when the forks reached full extension.  R65's didn't have a topping out spring and used a rubber bush instead which eventually disintegrates and may be your bits of black rubber.  You couldn't fit a topping out spring to an R65 because the damper rod would be too short although the otherwise identical forks on the R80st did a have a topping out spring and longer damper rods to accommodate that.

Attached is a parts diagram for the R80st forks which is the only one I can find that shows both the standard valve body and the alternative sprung valve although it's misleading in showing them to be the same length when the sprung valve body is in fact very much shorter.  The diagram also shows a short spring as topping out spring so it illustrates both locations where a short spring might be used.

[Rodeogeo]

Thanks for the replies.
The short spring appears to be longer than the topping out spring an R80ST has.
The long spring has identical ends that are more tightly coiled.
Dampening rod length is 10.0" (254 mm)
Valve Body - Length 1.16" (29.5 mm), outside diameter 1.18" (30.0 mm), inside diameter 0.785" (19.9 mm). The valve disc portion of the body has an inside diameter of 1.04" (26.5 mm) and a depth from the top of 0.18" (4.6 mm)

I'm leaning towards putting everything back the way it was before. I'll put the damper ring above the short spring and below the valve body (I might have "valve body" confused with "valve housing" part 31 42 2 301 885).
Attached a photo that shows the valve body better.