YSS PD Fork Valves and Fork Valve Assembly Instructions

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The Suspension Expert

Director Walter Preisig

The Suspension Shop is located in Adelaide, South Australia, and was established by Walter Preisig to service the market in Australia with a new generation of YSS gas shocks that are continuously under development by him in partnership with YSS in Thailand.

Walter has been developing racing suspension for over 25 years, gaining a wealth of experience in suspension technics, customer service and motorcycle maintenance.

YSS uses only quality materials and the latest wizardry in suspension technology to manufacture the world class YSS gas shock absorbers, maintaining quality control during the research stage, planning phase and the manufacturing process.

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“ It's unwise paying too much, but worse paying too little. By paying too much, you lose a little money. By paying too little, you could lose everything, because what you've bought would be incapable of doing what it was bought for. The law of business balance prohibits paying a little and getting a lot. If you deal with the lowest bidder, it's wise to add a bit for the risk you run and if you do that, you can pay for something better. "

That said and with this in mind, the Suspension Shop is servicing the motorcycle community in Australia and overseas as well as furthering the research, manufacture and development of top quality world class shock absorbers for racing purposes and casual driving without breaking the bank.

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YSS PD Fork Valves and Technical Fork Valve Assembly Guide

Note when ordering: Every Pack of YSS PD Valves contains 2 PD Valves in a Set. Prices discounted by $10 - no further discount from this page. now $175.00 was ~~185.00~~

PD Fork Valve 425 42.5 mm YSS PD Fork Valves

The new YSS PD Fork Valves give that progressive and controlled feeling of a cartridge fork. The PD Fork Valve has a radial computer designed valve housing made of 6061 T6 aluminium for light weight and is 65 Rockwell hardened for long life and appearance.

YSS PD Fork Valves are damping adjustable and tuneable to any application and they are Easy to install as well as extremely cost effective. YSS PD Fork Valves can be used for On- and Off-Road, Racing and Touring.

They are fully tested by YSS and proven to perform as you would expect from a superior YSS product. Our PD Fork Valves suit all brands of motorcycles with conventional forks, such as BMW, Harley Davision, Honda, Kawasaki, Suzuki, Triumph and Yamaha. PD Fork Valves are available in the following sizes: 17.5 mm, 31.0 mm, 23.8 mm, 33.5 mm, 26.5 mm, 36.0 mm, 29.0 mm, 42.5 mm

Call the Suspension Shop on +61 (08) 8284 8033 or visit us at LOT 257 Heaslip Road in McDonald Park 5121, South Australia - Our Suspension Shop has a huge stock of Fork Valves in the Warehouse for immediate fitting or dispatch.

Check out Oil Levels & Viscosity | Go to PD Valve Assembly

We recommend you select the correct fork spring for your motorbike and that you check the proper fit before you install your PD Fork Valves. Call the Suspension Shop on +61 (08) 8284 8033 for any questions you have regarding PD Fork Valves and selecting recommended Fork Springs.

Tool Requirements for PD Fork Valve Assembly

Required Tools	Diagram for PD Fork Valve Assembly
Drill Motor and 6 or 8 mm Drill Allen Socket 8, 10, 12 or 14 mm Tape Measure Tubing Cutter YSS Fork Oil YSS PD Fork Valves	PD Fork Valve Assembly Diagram

Required Tools

Diagram for PD Fork Valve Assembly

Drill Motor and 6 or 8 mm Drill
Allen Socket 8, 10, 12 or 14 mm
Tape Measure
Tubing Cutter
YSS Fork Oil

YSS PD Fork Valves

PD Fork Valve Assembly Diagram

Step-by-Step Guide for PD Fork Valve Assembly

NOTE: All these steps should be done by a qualified suspension mechanic. Or Suspension Shop is NOT responsible for any damage to shock absorbers, vehicles or injury to persons, if the instructions are not exactly followed. The warranty will also be void.
Note	Assembly Steps for PD Fork Valve Installation
PD Fork Valves are available in the following sizes for Motorcycles with Conventional Forks: 17.5 mm 31.0 mm 23.8 mm 33.5 mm 26.5 mm 36.0 mm 29.0 mm 42.5 mm Order Online Here or call our Suspension Shop +61 (08) 8284 8033	Take off the fork from the motorbike. Disassemble the fork (don't remove the seal) Take the fork spring and damping rod out. Place YSS PD Valve on the top of damping rod. Put the step on YSS PD Valve into the large hole. You must cover it completely (as shown in Picture 1). The inner diameter of fork spring must be at least 3-4 mm larger than the PD Valve plate (less than 3 mm - use with some models of PD Valves which have side flow space). Drill the compression hole in addition - the distance between the holes must be at least 10 mm apart (as shown in Picture 2) - the sizes of damping rods are as follows: 4 holes of 6 mm. (1/4 inch) for 175 4 holes of 8 mm. (5/16 inch) for 235 6 holes of 8 mm. (5/16 inch) for 265 and bigger Chamfer and deburr in and out of the compression holes. Check the YSS PD Valve (spring rate 7 Nm for 175, 235, 265, 290 and 12 Nm for 310, 335, 360, 425 with 2 turns of valve spring preload). Tighten the jam nut of YSS PD Valve. Assemble the forks as in your manual or do the reverse of reassembling. Drop YSS PD Valve down the tube to sit on the damping rod with the PD Valve spring facing up. Insert the fork spring into the inner tube on the top of YSS PD Valve. Add the fork spring spacer (cut them for 14-17 mm - same as the thickness of PD Valve, more or less depends on the fork spring preload requirement). Install the fork fluid by removing the fork spring and PD Valve, use the oil viscosity as recommended by YSS manual or manufacturer (10W for standard or 15, 20 and 30W for optional). Pump the fork for bleeding. Install YSS PD Valve and check the oil level. Install the spring and spacer. Re-check the spring preload. Install the fork caps and push on them. Tighten all bolts. Assemble the forks back to the motorbike completely.

NOTE: All these steps should be done by a qualified suspension mechanic. Or Suspension Shop is NOT responsible for any damage to shock absorbers, vehicles or injury to persons, if the instructions are not exactly followed. The warranty will also be void.

Note

Assembly Steps for PD Fork Valve Installation

PD Fork Valves are available in the following sizes for Motorcycles with Conventional Forks:

17.5 mm
31.0 mm
23.8 mm
33.5 mm
26.5 mm
36.0 mm
29.0 mm
42.5 mm

Order Online Here
or call our
Suspension Shop +61 (08) 8284 8033

Take off the fork from the motorbike.
Disassemble the fork (don't remove the seal)
Take the fork spring and damping rod out.
Place YSS PD Valve on the top of damping rod.
Put the step on YSS PD Valve into the large hole. You must cover it completely (as shown in Picture 1).
The inner diameter of fork spring must be at least 3-4 mm larger than the PD Valve plate (less than 3 mm - use with some models of PD Valves which have side flow space).
Drill the compression hole in addition - the distance between the holes must be at least 10 mm apart (as shown in Picture 2) - the sizes of damping rods are as follows:
- 4 holes of 6 mm. (1/4 inch) for 175
- 4 holes of 8 mm. (5/16 inch) for 235
- 6 holes of 8 mm. (5/16 inch) for 265 and bigger
Chamfer and deburr in and out of the compression holes.
Check the YSS PD Valve (spring rate 7 Nm for 175, 235, 265, 290 and 12 Nm for 310, 335, 360, 425 with 2 turns of valve spring preload).
Tighten the jam nut of YSS PD Valve.
Assemble the forks as in your manual or do the reverse of reassembling.
Drop YSS PD Valve down the tube to sit on the damping rod with the PD Valve spring facing up.
Insert the fork spring into the inner tube on the top of YSS PD Valve.
Add the fork spring spacer (cut them for 14-17 mm - same as the thickness of PD Valve, more or less depends on the fork spring preload requirement).
Install the fork fluid by removing the fork spring and PD Valve, use the oil viscosity as recommended by YSS manual or manufacturer (10W for standard or 15, 20 and 30W for optional).
Pump the fork for bleeding.
Install YSS PD Valve and check the oil level.
Install the spring and spacer.
Re-check the spring preload.
Install the fork caps and push on them.
Tighten all bolts.
Assemble the forks back to the motorbike completely.

Tuning Options for PD Fork Valves

Tuning	Standard	Optional	Advantage
^(1.) Oil Viscosity	10W	15W, 20W, 30W	More or less rebound depends on viscosity to make stability
^(2.) Valve Spring Preload	^(3.) Two (2) Turns	0 to 7	Overall firmness, controlling the speed of front end dives under braking
Valve Spring Rate	7 N for 175, 235, 265, 290 12 N for 310, 335, 360, 425	12 N 7 N	Overall firmness and smooth ride on square shaped bumps
Use oil viscosity to set the amount of rebound damping, then adjust the compression with the PD-Valve settings. The PD Valve does not affect rebound, however oil viscosity does. The primary compression adjustment is the amount of preload on Valve Spring. Measured from no tension on the Valve Spring. Two (2) turns of Valve Spring Preload for lighter riders.

YSS PD Fork Valves suit All Motorcycles with Conventional Forks

PD Fork Valves - Easy Installation - Order Online Here

Shock Absorbers for any Motorcycle

The SUSPENSION SHOP is your One-Stop Suspension Shop with a vast range of products at hand - ready made and also customised for any motorcycle. Feel free to call THE SUSPENSION SHOP to discuss a solution for your technical needs.

YSS | PD Fork Valves and Fork Valve Assembly