by Matt Wiley (with a little help from Paul Thede)


Vintage & Late Model Damping Rod Style Forks Dirt - Street 

See your DVS Setup Sheet for specific recommendations.

  • TYPICAL EMULATOR VALVE SPRING SETUP - For Vintage applications most Riders prefer the Blue 40 lb/in Valve Spring with 2-4 turns of preload. The best working range is 1-5 turns; if less or more Emulator Valve Spring Preload is needed change Valving Spring Rate. Move to the softer 26 lb Silver Spring OR up to the 64 lb Yellow Spring with 3 turns as the starting setting. Total tuning range is 1-6 turns for any given Valving Spring. Gold Valve Emulators are supplied with optional Valve Springs. Available Valve Spring Rates are: 26# Silver, 40# Blue/Black, 64# Yellow/Gold, 101# Red.
  • OIL VISCOSITY - 15wt Fork Oil is typical. Oil Viscosity (weight) is used to set Rebound Damping. Once the proper Rebound Damping is achieved the Emulator can be adjusted for Compression Damping. Note! Oil Viscosity Varries Between Brands as Suspension Fluid is Not SAE Regulated. Use same brand of oil when making Tuning Changes
  • OIL LEVEL - Common Oil Level is 130 - 160mm (Fork Spring out, chrome tube at the bottom of the stroke, measuring from the top of the oil to the top of the fork tube). Oil Level Tuning Range is 90-180mm in general. The Damping Rod must be covered with oil at full extension. Also, be sure not to exceed the maximum oil level as the fork will run out of compressable air space and it will inhibit full travel.
  • MAIN FORK SPRING PRELOAD - For Street the most common initial Fork Spring Preload is 10 - 25mm with RT Hi-Performance Fork Springs. The Tuning Range for Street is 5-35mm. The Range for Dirt is 2 – 15mm.
  • ADJUSTING THE EMULATOR - To adjust the Gold Valve Emulator you must remove it from the fork. This can often be done with the forks still mounted on the bike. If the forks are on the bike make sure the bike is supported with the appropriate bike stand. When you remove the fork springs, use a twisting motion to avoid oil drips.  To remove the Emulator, use a parts grabber or telescoping magnet.  Adjust the Emulator Valve Spring Preload a half turn at a time.  More Valve Spring Preload will make the forks stiffer.  Less Valve Spring Preload will make the forks softer.  Valve Plate Bleed Hole quantity affect is Initial low speed slow fork movement response.
  • BEFORE INSTALLATION - be sure the jam nut on the Emulator is snug using a socket.  Adjust Fork Spring Preload with spacer length or washers. Set the Fork Oil Level with the Fork Springs OUT, Gold Valve Emulator IN, Forks bottomed out (chrome tube at bottom of stoke)





Valve Spring Preload *

0 - 7 Turns

Overall firmness, controlling a mushy feel and the speed the front end dives under braking. 2 - 4 Turns initial setting is standard. 1 - 5 turns usable range

Valve Spring Rate***

26# Silver

40# Blue

64# Yellow

101# Red

Overall firmness and the ride on square shaped bumps, fast fork movements

Smaller OD 30-35mm Forks/Light wieght bikes may prefer 26lb/in or 40 lb/in spring at 2-4 turns range based on use and rider preference.

Larger heavier bikes and/or Larger Fork OD 36-49mm size may prefer the 40 lb/in or 64lb/in. spring at 2-4 turns range  based on use and rider preference.

101lb/in Mini MX Only

Emulator Valve Plate Lo-Speed Bleed Holes

1 – 4 Bleeds

Initial fork movement low speed damping & plushness before valve plate opens; small bumps, chatter, etc. Smaler OD Forks typically 4 Bleeds, Larger OD Forks 2 Bleeds unless very plush ride is desired

Oil Viscosity**

5wt - 30wt

Use oil viscosity to set rebound, this affects traction and stability. Heavier oil equals slower rebound, lighter oil equals quicker rebound.

Oil Level


Sets Final Firmness in the last 1/3 of Fork Travel - Bottoming Control

Fork Spring Rate

.38 – 1.2kg

Holds up weight of Bike/Rider, Sets Ride height, Sag, Fork Travel, Overall Front End Firmness

Fork Spring Preload


Fine Tunes Ride Height, Sag - SEE DVS CUSTOM SETUP SHEET

* Measured from zero preload (no tension) on the Valve Spring.  To find zero preload back off on the adjuster bolt until the spring is loose then tighten it until the spring just touches.
** Use oil viscosity to set the amount of rebound damping, then adjust the compression with the Emulator settings.  The Emulator does not affect rebound, however oil viscosity does. 
*** The primary compression adjustment is the amount of Emulator Valve Spring Preload.  Increasing Valve Spring Preload makes the fork stiffer.  The effect of all the variables will overlap providing extreme tuning flexibility.

Tuning Details

  • The Gold Valve Emulator Controls Compression Damping as the fork hits the bump. More or less Gold Valve Emulator spring tension (preload) makes compression Stiffer or Softer. Changing to different rate Emulator Valving Springs will Increase or Decrease overall stiffness by changing the slope of the damping curve (it will also effect the fork speed at which the valve plate opens). A Half Turn of Emulator Spring Preload is noticeable, a full turn is significant. Tune in half turn increments until you find the best setting. 
  • Another Tuning Variable for Low-Speed Compression Damping is the number of Bleed holes in the Emulator Valve Plate (under the colored valving spring) aka Low Speed Compression Damping Office. Emulator Plates may have either 1 or 2 or 4 pre-drilled holes in the valve plate. Adding additional holes (up to 4, same size as originals) will add plushness to low speed fork response (small bumps, slow fork movement). This is a good way to address fork chatter issues you may encounter on the race track or harshness over small ripples and such on the street or trail. These holes control oil flow that is too low to open the spring loaded valve plate. NOTE: Bleed holes have little effect on high-speed damping (large bumps, fast fork movement).
  • Oil Viscosity controls Rebound Damping; how quickly the fork extends after the bump. Thicker oil slows fork movement down, thinner oil speeds it up (5/10/15/20/30wt etc). Please note that Suspension Oils are not constant in viscosity between brands! Choose a brand and stay with it to ensure consistent results when making changes! NOTE: Oil viscosity should be used for tuning rebound damping. For compression damping, adjust the Gold Valve Emulator Valve Spring Preload, Valve Spring Stiffness or number of Bleed Holes.
  • Main Fork Spring Preload controls Ride Height. 15-25mm is the useable range for Street. For Dirt  3-5mm is typical. Move down/up in spring rate if you fall out of this range. NOTE: Tune in 2 - 3mm increments using washers supplied with the spring kit (or adjust spring preload spacer length when needed).
  • Oil Level controls bottoming along with fork stiffness in the last 30% of fork travel. Tune in 10mm increments.  Measure the oil level with the Fork Spring out, Gold Valve in, chrome tube at bottom of stroke, top of fork tube down to the top of the oil. NOTE: Tuning fork oil level will only affect the feel in the last 30% of fork travel. Use this variable to address bottoming issues or if not using most, or full, fork travel.

We encourage experimenting with settings to find your personal ‘sweet spot.’ Always take notes and record your changes. It is easy to go back to the original settings if needed.

‘The best youve ridden is the best you know!’

For more details on how Emulators work.