front fork progressives GS750

[Guest]

GS750E '79
1. I bought a set of new progressive front springs from the german company Wirth. I have searched for so long and found that i need 180 cc of oil (original service manual), but haven't found the height from oil level to top leg. Is the correct answer 140mm for the GS750 as it is for the GS850?

2. Apparently it is not necessary for a pre load spacer for my bike model. I am puzzled though, that the old spring (51cm) is longer than the new 50cm), and neither of them reach the top of the leg. I'm thinking I should make a spacer of pvc pipe (as seen in Bikecliffs guide) to achieve proper sag.

[cowboyup3371]

Walle,
I have 750EC forks on my 550. Here's the post in my rebuild thread that talks about the fork oil and level. If you look at the bottle real close, it's marked at 180 CC

http://www.thegsresources.com/_forum/showpost.php?p=1573530&postcount=186

I'm surprised about the spacer part as mine doesn't have one as well, has the Progressive springs for the 750, and has a built in spacer type set up in the cap.

[7981GS]

I added 1/4" of pre-load to the progressive springs in my '79 GS750E.
It rides near "perfect".

Daniel

[Walle]

Now they are installed. I have 42mm sag with me on its back - which is acceptable. But I will add a small spacer later like you did 7981GS.

[shryke300]

Did you end up using the volume method or the height method to determine the amount of oil the forks needed?