48 Twin chamber forks and Restackor program

[mconnell]

Has anyone tried running the Restackor shim analysis program with these forks? I run this program often when working on WP forks on KTM's, and I've gotten used to seeing damping force numbers that are in the 35-45 pound range in the high speed part of the compression stack. I've ridden many of these bikes as well, and they work well.

I also see numbers similar to this when modeling Japanese forks, so I'm pretty confident the numbers and modeling are in the ballpark.

But, when I model the compression valving in the 48 Zokes, I get numbers that are waaay softer than I'm used to seeing. I get numbers around 10 pounds with the stock valve stack and piston. Keep in mind that I'm just talking about the compression valving here - not the mid-valve.

Given that most people complain of stiffness with the stock 48 forks, I've got to assume that the mid-valve is the culprit. Although the float is similar to what I install in KTM forks, the valving itself is considerably stiffer.

Any comments? FYI - I have a suspension business that I've opened in the last year since retiring from my full time position as a mechanical engineer.

 

[Simmo737]

Has anyone tried running the Restackor shim analysis program with these forks? I run this program often when working on WP forks on KTM's, and I've gotten used to seeing damping force numbers that are in the 35-45 pound range in the high speed part of the compression stack. I've ridden many of these bikes as well, and they work well.

I also see numbers similar to this when modeling Japanese forks, so I'm pretty confident the numbers and modeling are in the ballpark.

But, when I model the compression valving in the 48 Zokes, I get numbers that are waaay softer than I'm used to seeing. I get numbers around 10 pounds with the stock valve stack and piston. Keep in mind that I'm just talking about the compression valving here - not the mid-valve.

Given that most people complain of stiffness with the stock 48 forks, I've got to assume that the mid-valve is the culprit. Although the float is similar to what I install in KTM forks, the valving itself is considerably stiffer.

Any comments? FYI - I have a suspension business that I've opened in the last year since retiring from my full time position as a mechanical engineer.

which year 48 zokes? they changed the valving in 2013, i'm tempted to get into mine and give you the stack and whatever you need to analize the new compression settings, i got next week off so maybe then cheers!

 

[mconnell]

I'm working on a 2013.

 

[twowheels]

which year 48 zokes? they changed the valving in 2013, i'm tempted to get into mine and give you the stack and whatever you need to analize the new compression settings, i got next week off so maybe then cheers!

They put a sticker on the fork guard and told you they changed the valving - 2012 and 2013 fork stacks were the same.

 

[mconnell]

Yes, Steve. That's what I've found to be true. This is my third set of these forks in for service, all from different years, and I've found the valving to be identical in all of them. One set of forks actually came from Germany. My customer bought them used from a guy that elected to swap to KYB. Still had the same valving.

 

[Simmo737]

I'm even more interested now, I'll have one apart next week and see if the euro spec 13 is different.

 

[Transparent tank]

My suspension tuner said the same thing. 11 replicas, racing, 12, 13 all of them have the same valving. :/