CARD 35mm WP Fork Kit

The CARD fork contains industry and OEM firsts including MX-TECH (MXT) Smart technology with the integration of a external adjustable SSBCV in one leg and a fully speed sensitive externally adjustable compression and rebound leg. A fully functional midvalve and base subvalve, and a elastomer controlled final bump stop.

This fork will eliminate the marginal ride quality of the Stock WP and Marzocchi forks. Its adjustable set-up allows for precise individual ride adjustment, and is easy to work on and service!

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CARD 37mm A-KIT Fork

Here it is. After a year in the making, the collective Effort of Cobra Motorcycle and MX-TECH’s Jeremy Wilkey has come to fruition. The 2013 CARD 37mm A-Kit fork.

 

CARD 37mm A-Kit Fork
Key Advantages:
• Kashima Coated Upper fork tubes. (Coated in Japan) Increases lubricity for easier fork movement in high loads and less stiction.
• DLC coated lower fork tubes. Decreased stiction and improved durability.
• Spring Perch rides on special Teflon DU style thrust washer. Decreased friction and smoother fork action.
• Hard coated inner fork cartridge tube for decreased oil contamination and more consistent fork performance.
• Customized valve settings each rider.
The 2013 CARD A-Kit fork is the best front suspension available combing specially engineered parts, coatings and set-up. Engineered to help your rider achieve the highest level of performance, through greater comfort and control.

 

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2013 KYB PSF updates.

With the ongoing development of the KYB PSF and a lot of really good info coming to the front of the reader’s attention, I’ve been generally silent. (Except for what I put on Face book.) We have been on this Air system for a long time. Early this summer when I read that the PSF was coming I had Kerry Cannon from Cannon Spring making me negative springs ( balance springs) to put in my standard KYB forks so I could do the air conversion myself. I was thinking we could potentially do conversions. And the learning curve was step; the conversion idea was not going to be possible. But I learned a lot. When the real version became available with the Kawasaki KXF450 I got one right away. (Along with the CRF450 that we received in September) The first rides where exciting but then the fork started to present its characteristics and flaws.

My Prototype Air fork. June 2012

In a nut shell the fork works really well on hard-pack, and jump filled tracks that involve rhythm and timing. The lack of friction from the coils of the spring is very noticeable and the fork has a nice fluid feel. However in fast, outdoor tracks with big braking bumps the fork is not so happy and becomes very harsh.  The root cause of the problem is that as the fork reaches the second half of the stroke the natural pressure increase due to volume change becomes very pronounced. In the final third the pressure increase is exponential and the air force is much greater than the valving, spring and air spring of a traditional fork.

We attempted a multitude of fixes and here is what we have found that is useful.  Stiffer midspeed valving (midvalve float) this keeps the bike out of the stroke a little delaying exponential increase in pressure as the fork uses stroke.  We run the Oil as low as possible; this delays the pressure rise until deeper in the stroke. Bottoming tends to start to occur. To better manage the bottoming control we designed and tested a SSBCV (Huck Valve) for the PSF. This makes a huge improvement. We have also been testing a MXT LFPR for the 32mm valve.

This image is the external subtank system we tested. It evolved to be an external volume compensation with dual pressure regions.  This was to precede the following more tiddy internal design,

 

 

We have also been testing a MXT LFPR for the 32mm pistons. The steel / Teflon ring seals better, and is more stable and lowers friction significantly.

Where is it going? We tested several types of pressure management systems. Enzo Racing style subtanks etc. The real solution will involve multiple pressure regions that compensate relative to position.   (Pressure) We are working on these designs right now.  If this type of stuff interests you make sure you look at the MX-TECH Face book. I’m always posting models of ideas and projects.

The PSF SSBCV Huck Valve P-types.

If you own a PSF fork now and want to improve it. I would do the following in order of value.

#1: SKF 48KHD seals. They will improve the performance and reliability of the fork.

#2: Lower the oil volume.  This will help the bike work better in braking bumps at the expense of bottoming control.

#3: Change the stock midvalve piston rings to the MXT LFPR. The Low Friction Piston Rings improve the wheels ability to follow the ground which improves comfort and control.

#4: Revalve for more midspeed compression damping, and less high speed. This improves plushness while delaying the pressure increase by reducing use of travel.

#5: Install the MXT SSBCV PSF Huck Valve.

Let me know what you think of this Blog.

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KTM 65SX Fork Solution Update.

 

For those of you who read my last post on the topic of the 2012 KTM 65SX forks and the design issues, and noted that I was working on a new solution. I have an update. It failed, or rather the design was a great, for a problem that could not be fixed so simply.

All is not lost, I went back to the drawing board and came up with a new plan. A new double cartridge set-up that uses one leg for SSBCV, and the other that is a speed sensitive  compression and rebound adjustable format.

The new design is importantly much different from the Betty 6 Five, as it focuses the quality where it needs to be and reduces manufacturing costs on many of the lesser important surfaces, greatly reducing production costs.

I’ll keep you up-to-date.

 

Jer

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Technix Japan.

I was surfing around my Japanese Partners web site and used the cool Google translator. Its neat to see the translation, If you have a second go take a look at the technix.jp site. Hiro and I have accomplished quite a bit together over the years and its always fun to see what his creative design staff comes up with. To read about our dealings click here.

 

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2012 KTM 35mm WP Solution.

The WP 35mm Fork has not been meet with rave reviews, and initially we hoped that our Betty6Five cartridge would do the trick. Unfortunately due to the “big piston design” the fork does not operate well given the zero-rod displacement system. The high volume, system while capable of dealing with the air pockets does not allow for a consistent damping force in compression or rebound. This in combination with stiff over-all damping rates makes for terrible suspension for the little riders.

I set out to design a rod displacement system that will allow for a constant cartridge volume and will allow the big piston design to be relaxed. The riders will be able get a nice smooth speed sensitive fork that will retain compression and rebound adjustability. The system will replace the stock inner seal / guide case with our  speed sensitive system.

I’ll keep you posted!

BR,

Jer

 

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Old Find.

Here is a little piece I did for the old site that really interested me.  I recieved a lot of e-mails from the post. Here are the other parts I never told you about.

Simple enough. I did a test to determine what the basis of the e7′s advantage really was.  I wanted to know if it was friction or if it was simply the increase in mechanical advantage due to the designs increase in diameter of the effective piston. The only way to do was to make a gas charged Piston set-up in the e7 tank. It took a lot of engineering  to get it all functioning correctly but we pulled it off.

It was money very well spent as it proved conclusively that friction was the selling point in a case where mechanical advantage is factored out just a few times 10-12 verse 34-36.. (That’s why bladders are such a waste in shock.)

Anyway the other pieces where something I was working on at the same time. Working through the various iterations of the then ”Huck Valve”.. This version was in fact what it looks like, a PDS needle / twin piston arrangement. We could never develop a enough volume and length to make this compact internal system work. I also tested a 1.5 version (Piston and Cup.) Same issues, it was at that point where the design went 100% external. I made the first parts on my rickety old Rockwell Lathe a Old-school Bridgeport Mill.  It was good times indeed, as I was rushing to get it built before my first Daughter Izzy B was due to arrive.

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KTM Linkage bike Clevis Diet.

Its time to give the KTM a Diet.. The Linkage KTM bikes have the heaviest clevis by a huge margin, maybe 50% more than the CRF.. I’m betting a lightened up billet clevis would have a better weight loss to cost ratio than Ti nuts and bolts. And it would reduce unsprung weight.. Not to mention I really just wanted to make a billet clevis for my test bike. I’m going to whittle this puppy down to nothing.. Now the important question What collor?

 

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An Intersting New midvalve design.

Here is a project I’ve been doing some work on that interests me.

I have designed and tested several different piston types (Including midvalve specific), and shim configurations over the years, with some significantly impressive and some equally unimpressive results.

With the midspeed, and the midspeed valve only the challenge has been specifically how to maximize or optimize the need for many shims (durability, and tune-ability), ultra-low floats and yet very low overall damping coefficients.

Many designs can maximize 1 or 2 of these aspects but struggle to balance all of the variables efficiently.

This represents my best attempt to maximize the relationships. It uses many different design aspects that I’ve sampled and evaluated over the 20 years I’ve been a professional tuner.

And here is how it works.
It’s a traditional rebound: Nothing goofy.. Standard port style and dimensions.

The compression face for this 24mm version, and also the 23mm version is a circular 20mm. The same OD as the standard port only it has about 40% more area..

This means we can achieve similar damping feel with significantly less float. Perhaps a rough equivalent could be made that .05mm float would equal .2mm in a traditional design. Additional peak deflections will be significantly lower resulting in less shim fatigue and combined with a regulation of greater area we will need as much as 60% more shims resulting in greater stability and durability.

I left a little room for other design aspects to take shape as well. The piston can be built with a traditional floating midvalve a MXT style midvalve of only one floating shim and a “solid clamp” design, and the newer “mechanical O-ring” design that KYB is now using and are we interested in but not finished evaluating.

I’ve seen enough dyno data and field data that would suggest this will meet the design objectives. But of course time will tell.

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Shock Body Instalation Video.

Check out my first run at a video. Shock Body replacment

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