The clutch is self-adjusting to compensate for wear. The total clutch pedal free-play is 0.35-0.59 in. (9-15mm). If there is no clearance between the master cylinder piston and pushrod, the release bearing is held against the diaphragm spring of the pressure plate, resulting in clutch slippage.
Loosen the locknut on clutch pedal switch A; back off the pedal switch until it no longer touches the clutch pedal. Clutch pedal switch A is the switch that contacts the clutch pedal below the clutch pedal pivot.
Loosen the locknut on the clutch master cylinder pushrod and turn the pushrod in or out to get the specified stroke and height at the clutch pedal. The pedal stroke should be 5.3-5.5 in. (135-140mm) on Prelude and 5.6 in. (142mm) on Accord. The pedal height should be 8.1 in. (207mm) on Prelude and 8.27 in. (210mm) on Accord.
Tighten the pushrod locknut.
Thread in clutch pedal switch A until it contacts the clutch pedal, then turn it in 1 / 4 - 1 / 2 turn further.
Tighten the locknut on clutch pedal switch A.