Throttle Cable Adjustment

Push the throttle link (A) toward the throttle lever (B) until there is no clearance.

Fig 1: Pushing Throttle Link Toward Throttle Lever
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check cable free play at the throttle linkage. Cable deflection (A) should be 10-12 mm (3/8-1/2 in.).

Fig 2: Checking Cable Free Play At Throttle Linkage
Courtesy of AMERICAN HONDA MOTOR CO., INC.
If deflection (A) is not within spec (10-12 mm, 3/8-1/2 in.), loosen the locknut (B), turn the adjusting nut (C) until the deflection is as specified, then retighten the locknut.
With the cable properly adjusted, check the throttle valve to be sure it opens fully when you push the accelerator pedal to the floor. Also check the throttle valve to be sure it returns to the idle position whenever you release the accelerator pedal.