NOTE: Do not adjust the throttle stop screw. It is preset at the factory.

With the engine off, check the throttle cable operation. The cable should operate without binding or sticking.
- If the cable operates OK, go to step 2.
- If the cable binds or sticks, check it and its routing. If it's faulty, reroute it or replace it and adjust it (see THROTTLE CABLE ADJUSTMENT ), then go to step 2.
Operate the throttle lever by hand to see if the throttle valve and/or shaft are too loose or too tight.
- If there is excessive play in the throttle valve shaft, or any binding in the throttle valve at the fully closed position, replace the throttle body.
- If the throttle valve and shaft are OK, go to step 3.
Check for clearance (A) between the throttle stop screw (B) and the throttle lever (C) at the fully closed position. If there is any clearance, replace the throttle body (see THROTTLE BODY REMOVAL/INSTALLATION ). Do not adjust the throttle stop screw.

Fig 1: Checking Clearance (A) Between Throttle Stop Screw (B) And Throttle Lever (C) At Fully Closed Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Throttle Body Test