I would still look for the latest oc fork of your model and see what they did at wp, they. Remove fork cap, preload spacers, washer and main spring from each tube. Dont let any oil get into the rebound adjustment rod hole. There are limitations of the stock wp split fork base valve designfunction that cant be resolved by only modifying the shim stack design aka revalve. I had the same question and discovered that the wp 4860 does have a mid. Wp ditched the forwardthinking design for one that is, in many ways, much more conventional.
As the screw is turned in farther, the spring exerts greater force against the shim stack, and the stiffer the valve becomes. Ktm 350 excf eu repair manual pdf download manualslib. You feel more grip traction of the rear wheel, you accelerate faster. You can modify the shim stack to suit the exact performance you want out of your bike. Mount and tighten nut guideline tap rebound nut m6x0. This manual goes into greater detail for those who wish to learn more about fine tuning. The floating shim stack technique is used because the midvalve is extremely sensitive. Shim valve compression and rebound damping fluid pressure has to deflect thin steel washers shims to open up an orifice and allow fluid to flow through it. By cross referencing the section 4 front fork disassembled of the spare parts manual between 0911. This is on the bleeding edge so it is not for everyone. Does anyone know what the stock shim stacks consist of in the forks and. Specially designed for enduro riding, the orvs includes complete compression and rebound assemblies with new pistons, finer adjustment needles, a new hydraulic bottoming cup which seals the cartridge tube to improve damping response time bottoming control and new top cap adjusters with updated cap labels. Wp 4cs fork rebuild and rt open chamber conversion with links to fmgv 280601 compression and frgv 200603 rebound gold valve installation these instructions outline the conversion of the wp four chamber fork to an open chamber design. Essentially, when the oil moves through the shim stacks it is also moving through a bleed hole.
The number of shims required will be shown with the shim size factor. Does the fork bottom too easily, or have excess dive when the adjuster is opened to the preferred plush position. And opposite, at a rebound movement the fluid is forced through the rebound shim stack and through the compression check valve. These forks require a special procedure on fork reassembly. If the piston velocity is high, the shims on top of the piston will also open to allow the fluid to flow through.
Rebound flow compression flow stop washer shim stack piston. If not, select a shim stack with more blowoff force. Race techs g3ld shock gold valve kit allows your honda crf250r to absorb the toughest of landings and smooth out the biggest of breaking bumps while remaining plush and providing traction over small chatter. Technical data fork technical data fork technical data fork fork part number 14.
All things alta wp 4cs what needs to be said page 2. We replace all the shims for all 6 shim stacks and redesign how the midvalve works. The fluid displaced by the piston shafts are directed either into or out of the cylinder tubes through the holes. If it presses against any smaller diameter shim except for the smallest shim, the spring force changes to fulcrum point that the other shims bend around, which reduces shim bending leverage and stiffens the shim stack. Ktech off road valve system is a direct replacement for the wp xplor cartridge systems. Regular you need next to the general equipment, the special tools of wp suspension. Yes, we know this is a significant departure from the stock wp 4cs, however through extensive testing, we have determined it is an essential modification.
Let fork stand upside down for 15 minutes to thoroughly drain all oil. It is important that you read this repair manual carefully and completely before the start of work. The ktech off road valve system is a replacement valve system for the wp 48mm aer forks fitted to husqvarna and ktm 125cc and above motocross bikes from 2016 onwards. Fork shim substitution calculator enter the existing shim information and the proposed shim thickness then press calculate. Dealer programs dealer application rt ride center program rt harleydavidson brochure. Wp suspension 4357 mx multi adjustor 2000 front forks workshop manual. Technical data fork technical data fork fork part number 14. The shim stack must be pressed down over the collar. Fork springs wp4860 43mm x 485mm for ktm, husaberg, wp. Can i manage to increase the wp 4860 mxma 1418x728 fork travel up to 280mm with spacer and only adjust the wp4860mxma 1418w710 with spacer to,then ok. In the case of the 4cs fork, one pattern we noticed missing was low speed damping control.
If the stock valves will flow enough just changing the compression shim stack will be a simple fix. Sep 06, 2017 it is the best fork on the market, albeit the aftermarket. These forks require special care when setting up both compression and rebound valving stack thicknesses. We make versions designed forthe wp aer 48 and wp xplor suspension forks. After testing hundreds of different valving configurations not just shim stacks, but any and all internal parts that affect damping, we begin to see patterns. Each fork can be finetuned to meet the special requirements of each individual customer open cartridge technology, wellestablished in racing compression and rebound damping easily adjusted at the top of the fork legs. A shim stack is a stack of thin metal discs that control the rate at which oil.
Aug 18, 2017 there are columns that represent each individual shim stacks. A tapered stack that deflected the same distance as a straight stack would present greater progression. The setup of a conventional damping system has always been a compromise between sufficient comfort and bottoming reserves, whereas the cone valve technology now permits a combination of both factors, resulting in outstanding damping behavior in all driving situations. I just purchased a 05 200exc and the suspension was done by pro action and the previous owner po is my weight, 165lbs. Wp fork springs wp48mm 44mm x 465mm ktm, berg, hqv wp.
Most forks actually have a separate rebound piston and shim stack and a separate compression piston and shim stack. Wp 4cs four chamber forks have been used in ktm european models since 20. These are not from another application other companies are offering shorter springs from japanese forks with spacers and only fit the wp 4cs fork. The 510mlml figures came from a rocky mountain atv vid on fork servicing the 4cs. Front fork off road valve system wp 4860 mxma 48 aer ktech. Then raise the top fork tube 10 to 12 while holding the bottom fork tube with your feet, cover and seal the tube with your hand, then push down to pressurize the oil into the cartridge. Rebound piston length available stack size free length. Mount shim stack info align the triangular plate exactly with the piston opening. Thankfully the way wp builds their forks they have a second separate bottoming shim stack located in the hydro stop at the bottom of the cartridge that will prevent bottoming of the fork if i get it too soft during the experiment. That limitation is the ability to provide sufficient low speed compression damping with out being too stiff or soft depending on the shim stack design. This manual goes into greater detail for those who wish to learn more about finetuning. Wp 4cs four chamber forks have been used in some ktm european models since 20.
He rode more hare scrambles as a c rider which i am too. Vc2a single stage stacks figure 1 a single stage stack is a twopart stack made up of a combination of a lo. Wp fork springs wp48mm 44mm x 465mm ktm, berg, hqv wp 4cs. Ktm 690e all things suspension related page 11 adventure. Vc2a single stage stacks figure 1 a single stage stack is a twopart stack made up. All modern forks, save for the two conevalveequipped designs, use shim stacks to adjust damping. The shock absorberfront fork steering damper is an impor. Beyond the basic calculation of the shim factor of an individual shim there is software available to assist in tuning suspension. Low floats generally require a more supple shimstack that is allowed to flex over a greater distance. Advice on wp ktm shim stack please motorcycle suspension.
The rest of the stack is left pretty similar except the 12mm pivot shim is removed to make the 14 x 0. If it is not, adjust the total thickness by changing the number of original packing shims the. Wp 4cs rebound leg figure 1 sleeve length gap 1501 pomona rd, corona, ca 92880 951. This valve kit increase flow area, putting valving control on the shim stack instead of the piston. Fwiw, other 4cs resources i found on the net agreed with the 65mm oil level for the 4cs fork. In addition to the tools required for disassembly and assembly. I own a 2007 ktm 300 xc with the 4860 open chamber fork. Dec 21, 2011 with the top fork tube bottomed out, add the oil. The relationship between float and shimstack stiffness is paramount. Stock shim stack configuration for 08 or 09 ktm 300 xcw. Aug 20, 2015 wp s new airspring fork is already available on european ktm motocross models, and it will likely be introduced in the us on 2017 ktms.
Pmk from ktmtalk said i maybe get lucky and get some advice from shock doc who frequents this site. Remove the nut, rebound shim stack, piston, sleeve and compression shim stack from the shaft. Remove fork oil by inverting fork over a suitable container and pump forks until no more oil is in the fork. Owners manual and suspension setup guide squarespace. Front fork off road valve system wp 4860 mxma 48 aer. Select the brand of your bike, the year and the model to find the right wp pro component for you. The next shim stack is called the high speed compression stack. The small diameter shim at the end of a shim stack is usually reffered to as the transition shim, if there is another stack postitioned behind it. Knowing that i dont have easy access to ktm used parts here where i leave, please guide me to get this done. This fixes all of the problems, unless you want to make an argument about not having any clickers on the bottom. High float mvs can utilise stiffer stacks with less chance of cavitation.
Pay attention to the following notes, when you are working with wp suspension products as described in this workshop manual. Does anyone know why ktm wp left them off of these new forks. The orvs replaces the original compression and rebound damping assemblies along with the adjustment needles giving improved. Click one of the buttons below to learn how revalve control works in your fork. Nadelseitig montieren 4860 1123 4860 0999 hydrostop art. All of these compression shim stacks are on the same. The wp xact pro 7548 fork permits almost limitless damping performance due to a unique valving system. Upgrade your oem compression fork valves for these 7075 aluminium valves with hard anodising. Each fork can be finetuned to meet the special requirements of each individual customer open cartridge technology, wellestablished in racing compression and rebound damping easily adjusted at the top of the fork. This is positioned behind the midspeed compression stack, in the same manner. It is usually referred to as a base valve because it is mounted in the base or bottom of the fork. This will not affect the safety or function of the product as long as the runout is within the.
So that base valve shim stack seems to have been beefed up quite a lot to my lessthanwellinformed opinion, presumably because by the time the shim stack comes into play the forks are into their stroke so there is more. The new design is a major departure from their controversial 4cs fork. Fork, triple clamp info the side with the largest inside diameter faces downward. The orvs replaces the original compression and rebound damping assemblies along with the adjustment needles giving improved damping characteristics and wider adjustment range, enhancing overall ride quality and stability to the. Husaberg motorcycle front suspension husaberg wiki.
1472 1276 718 854 34 83 372 356 914 279 231 881 592 689 1214 261 1044 62 329 897 1243 1250 298 1444