The Emulator and top of damping rod must be covered at full extension.ĭo not exceed the maximum oil level as the fork will run out of compressable air space and will inhibit full travel. Measured from the top of the fork tube to the top of the oil with the Fork Springs out, Emulator in, and forks completely bottomed. Stick with the same brand if tuning rebound.īottoming Control - sets final firmness in the last 1/3 of the fork travel. Once oil viscosity is selected the Emulator is used to set compression. Generally use the oil viscosity recommended on the DVS Setup Sheet. Oil viscosity is used to set rebound - the rate the suspension extends. Smaler OD forks typically 3-4 Bleeds, larger OD forks 2 Bleeds unless a very plush ride is desired These holes control oil flow that is too low to open the spring loaded valve plate.īleed holes have little effect on high-speed damping (large bumps, fast 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.

Initial fork plushness, low-speed damping small bumps, chatter, etc.Īdding additional holes (up to 4, same size as originals) will add plushness to low-speed fork response (small bumps, slow fork movement). Larger heavier bikes and/or larger fork OD (36-49mm) may prefer the 40 lb or 64 lb spring at 2-4 turns. Smaller lighter bikes and/or smaller fork OD (30-35mm) may prefer the 26 lb or 40 lb spring at 2-4 turns. Overall firmness and the ride on square shaped bumps, fast fork movements If more than 6 turns are required increase the Valve Spring Rate. More Preload makes more damping and is stiffer. To find zero preload loosen the jam nut and back off the adjuster bolt until the spring just touches. Measured from zero preload (no tension) on the Valve Spring. Overall firmness, controlls a mushy feel and the speed the front end dives under braking. BEFORE RE-INSTALLATION be sure the jam nut on the Emulator is tight.To remove the Emulator, use a parts grabber or telescoping magnet. When you remove the fork springs, use a twisting motion to avoid oil drips. Make sure the bike is supported with the appropriate bike stand. In many cases this can be done with the forks still mounted on the bike.

$harley fork oil viscosity chart$

ADJUSTING THE EMULATOR - To adjust the Emulator you must remove it from the fork.

The effect of all the variables overlap providing extreme tuning flexibility.

The main tuning variables are Valve Spring Preload, Valve Spring Rate, and the Number of Bleed Holes.

Rebound Damping is affected by oil viscosity (oil thickness).

The Emulator controls Compression Damping as the wheel hits a bump or dives on braking.

See your DVS Setup Sheet for specific recommendations. By Matt Wiley (with a little help from Paul Thede)

Harley fork oil viscosity chart