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Here's my .02 since I just did the preload fluid change on mine.
First, I see absolutely no need to remove any body parts to do this job. Just remove the 2- 10mm head bolts holding the preload body. You don't even have to remove the knob unless you want to clean all the crap out from behind it. Unhook hose from plastic holder underneath so you have enough slack to grab the reservoir with a crescent wrench and remove the banjo bolt holding the hose on. (don't forget to mark orientation of hose on preload body) Take over to bench and do as Dave states in the first post. Assembly is reverse of this.
You will need new copper crush washers or it will leak. Since Honda doesn't list them separately you have to buy the entire shock assembly.
Here's the fluid I used and correct Honda copper washer part #.
Not for use in rear shock applications because no Honda OEM shock is owner serviceable for the DAMPING oil contained inside the shock body and Showa likely uses a different viscosity and formula fluid for damping rear shocks compared to forks.
Not for use in rear shock applications because no Honda OEM shock is owner serviceable for the DAMPING oil contained inside the shock body and Showa likely uses a different viscosity and formula fluid for damping rear shocks compared to forks.
Don't confuse that with the preload adjuster mechanism which is external to the actual shock absorber body and it's damping function. Shocks may or may not have a remote preload adjuster like the ST1300 has. The hydraulic preload adjuster on a motorcycle rear shock is no different from a standard hydraulic jack mechanism that uses a light oil to set and maintain the relative position of two movable pistons. Move the adjuster 5 mm down it's bore and the collar on the shock moves 5 mm and compresses the spring 5 mm. You could use vegetable or olive oil to do the same thing although using fork oil or hydraulic jack oil is recommended. It remains stable over time and doesn't turn rancid. You could also use Marvel Mystery Oil.
Not for use in rear shock applications because no Honda OEM shock is owner serviceable for the DAMPING oil contained inside the shock body and Showa likely uses a different viscosity and formula fluid for damping rear shocks compared to forks.
Don't confuse that with the preload adjuster mechanism which is external to the actual shock absorber body and it's damping function. Shocks may or may not have a remote preload adjuster like the ST1300 has. The hydraulic preload adjuster on a motorcycle rear shock is no different from a standard hydraulic jack mechanism that uses a light oil to set and maintain the relative position of two movable pistons. Move the adjuster 5 mm down it's bore and the collar on the shock moves 5 mm and compresses the spring 5 mm. You could use vegetable or olive oil to do the same thing although using fork oil or hydraulic jack oil is recommended. It remains stable over time and doesn't turn rancid. You could also use Marvel Mystery Oil.
