Throttle Cable Adjustment

Remove the throttle linkage cover plug (A).

Fig 1: Removing Throttle Linkage Cover Plug
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check cable free play at the throttle linkage. Cable free play (B) should be 10-12 mm (3/8-1/2 in.).
If the free play is not within spec (10-12 mm, 3/8-1/2 in.), remove the throttle linkage cover (A).

Fig 2: Removing Throttle Linkage Cover
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Loosen the locknut (A), turn the adjusting nut (B) until the free play (C) is as specified, then retighten the locknut.

Fig 3: Adjusting Free Play
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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.