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Austin269 Austin269
8/23/2017 7:59 PM

I have a 2014 250sx and want to put the yz250 forks on it. Does anyone know of a kit, of if it's even possible without custom fabrication?

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ML512 ML512
8/23/2017 8:07 PM
Austin269 wrote:

I have a 2014 250sx and ...more

There are a few tuners that can slip the SSS cartridge kit into the WP tubes. It's much easier to do then deal with putting on the full forks...hit up Enzo, Ross has been doing some lately.

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Radical Radical
8/23/2017 8:57 PM

I have a question about SSS forks that has been bugging me for a while.
Many articles, videos, shops recommend drilling holes in the ICS Piston.
Enzo recommends it, among others.

My question is if drilling holes in the ICS piston or using an upgraded piston that is completely open, also without the upper o-ring changes the SSS speed sensitive circuit in any way?

Thanks in advance.

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ML512 ML512
8/23/2017 9:21 PM
Radical wrote:

I have a question about ...more

The small drilled holes are recommended to keep the stock plastic unit from literally exploding when too much pressure is applied...it allows for a small bleed and releif in these situations.

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langhammx langhammx
8/23/2017 9:38 PM

I have a set of sff spring forks/ complete front wheel/ Dunlop tire and full nissin brake set up with 270mm rotor and Galfer brake line from a '14 KXF 250 that will bolt right up, if you're interested ?
Has about 5-10 hrs on it all since new.

I can be reached @
Langhammx@sbcglobal.net

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Radical Radical
8/23/2017 10:11 PM
Radical wrote:

I have a question about ...more

ML512 wrote:

The small drilled holes ...more

Thanks ML!

Do the holes or having the piston have completely open sides like most of the aftermarket pistons com affect the speed sensitive circuit? I'm wondering why KYB doesn't sell the pistons with pre-drilled holes.

Honestly, I spent a lot of money upgrading my 2005 to SSS and I want to make sure that I'm getting the full advantage of SSS.

I'm wondering if one of the engineers from KYB would have the answer. There's a lot of confusion out there about this topic.

Thanks again!
Radical

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cmotodad cmotodad
8/23/2017 10:43 PM

I have done couple sets of WP forks with SSS internals. It is very easy and they forks work unbelievable. So much better than any WP fork I have ridden.

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metal_miracle metal_miracle
8/24/2017 2:16 AM

Its not hard to use a Complete SSS fork if you don`t have the tools to convert your wp forks.

This will only work on the newer SSS not the older they are to thick on the top..



Stock clamps work but you need a 0.4mm thick shim in the bottom clamp (Or X-trig from Technical Tutch)


For using Original Ktm wheele
Use 2000 wheel spacer that you grind down one of the lips and slot into the original wheel spacer
Original right side spacer needs to be shortened.

For break you got 3 Options

1.Drill a Extra bolt hole in original Brake adapter
2.Custom Brake adaper
3.Honda/Yamaha Front Brake

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DAYKIN17 DAYKIN17
8/24/2017 6:10 AM
Austin269 wrote:

I have a 2014 250sx and ...more

ML512 wrote:

There are a few tuners ...more

Agree 100% with ML512......Enzo in Canada is doing the same mod and the diffence is unbelievable.

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slipdog slipdog
8/24/2017 7:23 AM
Radical wrote:

I have a question about ...more

ML512 wrote:

The small drilled holes ...more

Radical wrote:

Thanks ML!

Do the holes ...more

The free piston mod will not change the "speed sensitivity" of the fork. Speed sensitivity is manipulated in the valve bodies of the fork. The term "sss" is just a buzz word as all cartridge forks are speed sensitive.

In stock form the solid free piston with both o rings seals the ICS chamber from the outer main spring chamber and that's where you run into problems with the plastic piston breaking under the pressure rise of the fork compressing the the air space. When you relieve that pressure by drilling holes in the piston you now have a situation where the outer spring chambers pressure rise is equalized into the ICS chamber area. With that, like the outer spring chamber, you will now have a bit more pressure backing the free piston as it compresses the ICS.

Technically, you will now have a bit more inner cartridge pressure as the ICS compresses, but that would be more of a "position sensitive" change since the pressure rise is related to how much the fork has compressed in the stroke. You would have to run the fork on a dyno to graph the changes, but I have never once heard anyone with the free piston mod say they felt it change the way their fork worked. In other words, it's not anything worth worrying about.

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Radical Radical
8/24/2017 2:00 PM
ML512 wrote:

The small drilled holes ...more

Radical wrote:

Thanks ML!

Do the holes ...more

slipdog wrote:

The free piston mod will ...more

Thanks!

What about using a free piston where the sides are completely open, and without a upper o-ring?

I definitely noticed a difference, but there were other factors after the rebuild that could have caused the change.
My suspension guy recommended running less oil on a 125. He set it up with 300cc (and would've liked to go lower) rather than the stock 335 or the 350cc the forks came with.

While he was in there, he replaced a broken piston with one that has completely open sides, and no upper o-ring.
On the good piston he drilled the relief holes and removed the upper o-ring.

Before adding oil, the forks washed out easily and just felt soggy. It seems these forks really need the oil to perform.

When I brought the oil up to 325 they're way better, but not like they were before the free piston changes. It seems softer. I've added another 10cc, and will gift that a try. Hopefully what I'm experiencing is from simply not having enough oil.

I appreciate your and ML's advice.
Thanks!



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Tomok Tomok
8/24/2017 2:04 PM

TBT Arizona did the KYB SS conversion to my 4CS forks. They are awesome! Maybe he could help you out.

2019 KTM 250 SX
2016 Husqvarna FC-450
2015 KTM 150 SX
2015 KTM 200 XC-W

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sebastianer sebastianer
9/23/2017 2:18 PM
metal_miracle wrote:

Its not hard to use a ...more

which is considered to be the newer sss forks ? 2014 and up ?

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