The best way to adjust the idle on your Honda OHV lawn mower is with a single cylinder handheld tachometer. There are two adjustments for the idle on the Honda mower. When you use a tachometer to adjust the throttle stop screw, you will ensure that you have enough RPMs to maintain idle and still have fuel efficiency. Tachometers are available at auto parts stores and home improvement centers.
Place the Honda mower outside on level ground. Locate the throttle stop screw and the pilot screw. The throttle stop screw is directly under the air cleaner assembly on the carburetor. The pilot screw is a flathead screw located to the lower left of the pilot screw.
Start your Honda mower and allow the engine to reach operating temperature. The engine will need to run approximately two minutes to warm up.
Place the throttle lever to the low setting. The low setting will have a picture of a turtle on the indicator plate by the handle. Attach the wire from your tachometer to the spark plug wire.
Turn the pilot screw with a flathead screwdriver until the engine will idle without shutting off. The engine should maintain a steady speed while idling.
Turn the throttle stop screw with a Phillips-head screwdriver until the the engine reaches the standard idle speed of 150 RPMs. Turn the throttle stop screw in small increments until the tachometer reads 150 RPMs.
Things You Will Need
- Handheld single engine tachometer
- Flathead screwdriver
- Phillips-head screwdriver
- Keep hands and feet away from mower chute while adjusting idle speed.
- Remove the Carburetor from a Toro Lawnmower
- MTD 139 CC OHV Engine Specs
- Adjust the Carburetor on an Echo Line Trimmer
- Adjust the Drive Belt on a Craftsman Lawn Tractor
- Adjust a Carburetor on a Ryobi Grass Trimmer
- Change the Oil in Cub Cadet Lawn Mowers
- STIHL Weedeater Troubleshooting
- Use a Plug in Electric Lawnmower
- Start a Murray Lawnmower
- Fix the Drive Cable on a Troy Bilt 860
- How Can I Make My Toro 6.5 HP Lawn Mower Run Faster?
- Adjust the Idle on a Briggs & Stratton Lawn Mower