Different spring for Fox Twinclicker

[eric318]

Hello all,

I have refurbished the  80's Fox Twinclicker fitted to the XR500 HPF.
It seems to me that the static and rider sags are too small, the spring is too stiff. Would love some views

Here is some data.

With zero preload:
Static sag: 3cm
Rider sag: 8,5cm
So I figure a spring 30% softer would bring me in the right range with some room to augment preload if needed. Is that right?

Current spring:
ID: 58mm
Length: 26cm
Rate: 11kg/mm
Wire diam: 14mm

I believe that I need a spring with the same ID, same or shorter length, and a rate of about 7.5 kg/mm (around 30% less than current).
What you folks say?

Cheers, E

[evo550]

The static and race sag relationship seem a little odd, I'm not sure on those HPF spring set ups (it has a full floater type linkage correct?) and what the standard set up is (a Suzuki person may be able to shed some light), but try 100mm race sag and see what static sag you get, but common sense tells me that decreasing your spring preload tension ( to increase the amount of race sag) that would increase the amount of race sag to indicate to soft a spring. So you seem to be on the money with that one.
Have you tried the race tech spring calculator?

[eric318]

An update after my long silence.

I was fortunate to come across a suspension magician: Phil Douglas who got me all sorted. What a difference a softer spring and the talent of a real suspension pro make...

It is all here: http://www.xr500only.com/xr500-c-j-hpf/fox-twinclicker