How to adjust clutch on Honda Valkyrie ?

Park the motorcycle on its kickstand. Turn the handlebars completely to the right to place the clutch master cylinder on the left handlebar in a level position.

Remove the pair of screws that secures the fluid reservoir cover to the clutch master cylinder with a Phillips screwdriver. Pull the inner diaphragm and set plate out of the fluid reservoir. Using a syringe, suck out the old brake fluid from the master cylinder. Refill the fluid reservoir with fresh DOT 4 brake fluid.

Follow the clutch master cylinder's hydraulic line to the clutch slave cylinder on the motor. Place a length of clear plastic tubing over the tip of the slave cylinder's air bleed valve. Place the opposite end of the tubing into a container to collect used brake fluid.

Open the air bleed valve counterclockwise a half turn with a 9 mm wrench. Pull in the clutch lever to force a small amount of brake fluid our of the air bleed valve. Close the air bleed valve, turning it a half turn clockwise with a 9 mm wrench. Release the clutch lever slowly. Repeat as necessary until the brake fluid trapped in the plastic tubing is clear and free of air bubbles. The clutch lever should require a small amount of effort to disengage the clutch. Repeat this step if the clutch lever moves freely without resistance.

Top off the clutch master cylinder's fluid reservoir with fresh DOT 4 brake fluid. Wipe away any spilled fluid with a clean shop towel. Insert the set plate and diaphragm into the reservoir and place the cover over it. Insert and tighten the cover's screws with a Phillips screwdriver.

Remove the plastic tubing from the air bleed valve and wipe any spilled fluid away immediately with a clean shop towel. Tighten the air bleed valve with a 9 mm wrench.

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IT WHIRRS WHEN I LET OUT THE CLUTCH: In neutral... Like most motorcycles, the Valkyrie has a [constant mesh transmission]. The engine puts power to the rear wheel with three shafts -- the crank which drives half the clutch, the input shaft which is driven by the other half of the clutch, and the ouput shaft (to the drive shaft). When the clutch is "in" it is not engaged and only the crank is turning -- the input shaft of the tranny won't be doing much since the other half of the clutch is not spinning (it is a little). When you let out the clutch, the input shaft causes all the gears inside the tranny to spin (even the output gears), splashing oil and whirring around just as if you were moving, but in neutral you're not engaged to the output shaft so you don't move. You'll feel a little vibration from this. The reason it is so noticeable with the Valkyrie is because the engine itself is so exceptionally smooth. Those now whirring gears get noticed. On a typical V-twin, this activity is usually masked by an engine vibration that the Valkyrie lacks almost entirely.