Hi! I have recently bought my first bike, a FZS600 - 1998 and have been fixing it up a little while waiting for my permit to practice driving.
Since I'm very heavy (148 kg / 326 lbs) I'm looking to replace the rear shock spring, I have looked at ordering an Eibach Coilover Spring but I'm unsure of the dimensions. They're asking for the inner diameter and length, which I believe is 2.25" (~57 mm) and 9.0" (~229 mm) - does anybody know if those are the correct dimensions? They also want the spring rate, for which I've entered 575 lbs/in (10.27 kg/mm, 100 N/mm). Does that seem reasonable or should I go up to 600? I would rather it be a bit on the stiffer side than softer. I used Race Techs spring rate calculator to get that number but as they did not have the FZS600 to pick I used an YZF600R - 98 with a custom bike weight of 452 lbs / 205 kg which should be the wet weight of the Fazer, hopefully that's fine.
EDIT: Is it possible to have the OEM rear shock absorber serviced and revalved?
The reason I'm only looking to replace the spring is I can't justify replacing the entire rear shock, I'm open to suggestions of other springs if you think there are ones better suited to my needs (please provide a link if possible, it would be greatly appreciated!).
I'm very new to all of this and will be learning more or less everything mechanical from scratch as I have zero experience or prior knowledge, hopefully I have asked you the right (dumb) questions. Thanks in advance for any help!
![[Image: gUjopgf.jpeg]](https://i.imgur.com/gUjopgf.jpeg)
Since I'm very heavy (148 kg / 326 lbs) I'm looking to replace the rear shock spring, I have looked at ordering an Eibach Coilover Spring but I'm unsure of the dimensions. They're asking for the inner diameter and length, which I believe is 2.25" (~57 mm) and 9.0" (~229 mm) - does anybody know if those are the correct dimensions? They also want the spring rate, for which I've entered 575 lbs/in (10.27 kg/mm, 100 N/mm). Does that seem reasonable or should I go up to 600? I would rather it be a bit on the stiffer side than softer. I used Race Techs spring rate calculator to get that number but as they did not have the FZS600 to pick I used an YZF600R - 98 with a custom bike weight of 452 lbs / 205 kg which should be the wet weight of the Fazer, hopefully that's fine.
EDIT: Is it possible to have the OEM rear shock absorber serviced and revalved?
The reason I'm only looking to replace the spring is I can't justify replacing the entire rear shock, I'm open to suggestions of other springs if you think there are ones better suited to my needs (please provide a link if possible, it would be greatly appreciated!).
I'm very new to all of this and will be learning more or less everything mechanical from scratch as I have zero experience or prior knowledge, hopefully I have asked you the right (dumb) questions. Thanks in advance for any help!