Progressive Springs - How Much Oil?

[Dyna494]

I don't have the over priced triumph tool but I stripped down my forks and fitted progressive springs to the internals.

Without the special tool I cant compress the forks with no springs fitted and measure the air gap that progressive say should be 80mm.

Did any one measure how much fork oil to put in with progressive springs?

I have an R3 standard and the manual says fill with fork oil until the air gap is 89mm with forks fully compressed and no springs fitted or alternatively put in 667mm oil.

With Progressive Springs, progressive say fill until there is an 80mm air gap with forks fully compressed and no springs. What does this equate to in mm?

Thanks in advance.

 

[Dyna494]

Did any one measure how much fork oil you put in when changing to progressive springs?
Does anyone know how much oil to put in or can anyone work out or guess how much for oil leaves an 80mm air gap?

 

[Dyna494]

With so many people changing to progressive shocks someone must have measured in the fork oil??????????

 

[Dyna494]

If nobody knows or can't find out I'm gonna try slightly more that the standard 667ml and put in 675ml then see how it feels when I ride it.

 

[Blastedbones]

I don't know the volume, but have you tried phoning a triumph dealers service dept. & asked?

 

[Dyna494]

Thanks but unfortunately the Triumph dealers can only quote standard parts and standard information quoted in the manual.

 

[Blastedbones]

Thanks but unfortunately the Triumph dealers can only quote standard parts and standard information quoted in the manual.

Seems odd, here I'd just ask one of the mechanics from the workshop. If they've done a spring replacemnt, they'd tell you what volume of oil they used....

 

[Dyna494]

The Triumph dealers want me to take my fork legs in and said they can finish the job for £40 - £50.

You need a special too to re-fit the springs after you have measured the air gap withthe forks semi assembled.

As long as the oil is virtually the same in each fork leg, just how critical is this anyway? If I put in 675mm oil and it seems ok riding am I being overly concerned?

 

[Blastedbones]

If you can sit on the bike & bounce your weight on the bars ( hold the bars with frount brake on & push hard down a few times) & the forks feel firm, you can't get them anywhere nearing bottoming out, then they're ideal.( Soggy forks that easily bottom out, are dangerous, cause aweful handling, & can cause a crash under heavy braking , due to excessive dive). Probably more important than anything is that they're set identically ( balanced).
I'm not a mechanic tho.. so this is just personal experience talking.