Looked at the R100 again this weekend with my twin brother - who has a r100gs.
I stripped the saddle as there was quite a bike of loose paint with rust underneath. And I also think that the foam at the front of the saddle is past its best. Once I got the glue and paint off the seat base it did not look half bad - the rust was only on the surface and the base looked otherwise solid. So I coated it with a 'cure rust' treatment and then primed it up.
It was only when the primer was on, that I noticed 2 small cracks emanating from one of the hinge arms - where it fixes to the seat. Not having any access to welding equipement - I am unable to do much about it than keep an eye on them - they are both less than a cm long - but I am aware that this might be an area of weakness as I have seen one or two broken ones on ebay....ho hum. :-?
I hope to have the seat back together by the weekend - with a new bit of dense foam at the front and the satin black painting completed. I will just have to be careful with it regarding the cracks - although if I bolted a plate above hing arm(between the topside of the saddle and the seat foam) - it might strengthen it enough.

We also looked into the forks again as I was thinking of fitting a 2cm spacer in the top, above the springs to firm things up. I had already put some fork oil in them last week, but had not yet actually been inside them.
After having bought the required 36mm socket to get the top off the fork leg I was dismayed to see the state of the inside of the left hand fork leg - the spring was covered with a muddy deposit - This was consistent with my earlier findings - however they we easily cleaned up with a rag and most of the sludge from the bottom for the fork was also cleaned out with a long stick and rag followed by a flush through with some fork oil.
We did find, however, that the springs we progressively wound, which was a bonus. The right leg was fairly clean. As the springs were progressives I decided against the spacers, so we just put them back together with new SAE 10 fluid instead of SAE 3 or 5. This will be a roadster rather than a long distance tourer and I prefer my bikes to be a bit on the firm side
I was however very suprised at how flimsy the yoke (triple tree) arangement was on these bikes - although it is well documented. Without the forks being clamped to the steel pressing that is an excuse for a top yoke, they still move around a bit, even with the wheel and the bottom yoke secured. I wish I could have fitted the R65 yokes instead - no wonder there is a whole industry created to replace the top yoke with a billet item.
I am now wondering whether firming up the fork action will just highlight the shortcomings of the yoke arangment...
We put in the missing switch blanks on the crash pad, fitted the newly painted mirrors and the second hand carrier/grab handle is also fitted- so at least we are making some progress....So far:
1. Repaint mirrors (satin black - got some - cheap) - Done

2. Finish removing wiring extensions for left handlebar switch gear - in progress
3. Clean up and paint headlight/ears - satin black (still cheap)
4. Buy and fit small rear carrier/grab rail (£30 odd) that was once fitted as standard - I have the holes to prove - Done

5. Touch in frame where required - satin black (you guessed it - cheap)
6. Buy new switch blanks for crash pad (pennies) - Done

7. Clean up and paint rear subframe minor surface rust....satin black.
8. Remove and repaint Koni springs - gloss back - tricky but dampers ok.
9. Repaint seat base - satin black! - put in a little bit more foam - its sagging a bit. A little project in itself. But seat base is otherwise good as is the cover - In progress :-/
10. Bodge stantions - inc new fork seals.
11. Tune up - when I can remove the screws to balance carbs!
12. Blow over both alloy wheels with aluminiun paint.
13. Tyres - a pair of touring deep tread conti's....
Yesterday - I rode the R65 cafe racer into work - forgotten how well she handled compared to the the 'old barge'. Must not forget Ruby...thats what I call her.
Cheers
Steve