The rear shock on my 1990 K100RS 16v(30.000ml) is non adjustable and seems adequate at best,a good friend has offered me an adjustable damping shock from a similar mileage 1993 K1100LT for next to nothing.Question is would it offer any improvement:present shock is Bilstein,K1100 shock is Showa.Provided I keep power on & corner smoothly I can manage OK with present shock and it does not leak but ripples/bumps upset the rear of bike whilst front end still feels "planted".