Can you refill a standard '85 K100 rear suspension?

No ! RIP

fyi

there is a forums order running for wilbers suspension & front springs

interested ?

Zitat von "JoelB"

Mine was good until it leaked. Can I put oil back in it and seal it up again?

indeed you won't be able to repair the shock yourself but depending of where your garage lives (<Profile>!), a replacement of the original Bilstein shockabsorber within the existing spring is available or can be done for you by de Hobbyist
I for myself purchased a new rear shock (IKON).

moin Erik