That sounds like a spring problem not an oil problem.
If the springs don't pop up a couple of inches when you take the top nuts off then they either need spacing out or replacing.....
what is the correct amount of oil and what capacity. for a 1977 R100rs. motorsport.
I've got so confused, different manuals give different measurements.
I replaced all the internals and new stantions about 800 miles ago. put 8 fl oz of sae 7.
but they seem to be sticky, If I put the front brake on and pump the forks up and down. they don't return to the top of the fork travel. if i pull up on the handlebars the forks extend about 3". I need to remove the bottom screw plug on the r/h fork leg as it has a drip of oil. although i replaced the copper washers, the big sealing washer and PTFE tape around the threads.
"
regarding sealing the big nut I changed from a aluminum sealing washer to a copper one.
put ptfe tap on threads and used fibre washers instead of copper washers under the damper rod nut that sticks out the bottom. used sae 5 motul fork oil.
So I have cured my stiction fork problem.. removed and stripped forks. top rubber buffers had disintegrated. the fork oil resembled crumbled up digestive biscuits mixed with fork oil and sand. it was all inside the damper rods and both the sprung loaded ball valves were blocked completely. it was all around the piston rings. jamming the whole thing up.
I washed everything out, fitted new top and bottom buffers. and the springs were sticking out the top of the forks about 2". before they were about 1/2". due to no top rebound buffers. fitted new seals rubber grease around the seals. fitted gaiters, and reassembled the front end,
Top rubber buffers? The rebound bushes? BMW: 31 42 2 000 384? They only lasted 800 miles?