It's a straightforward job if you have the right tools and follow safety steps. You'll need a 14 mm (6-point) socket wrench and a torque wrench.
- Turn the fuel valve OFF.
- Disconnect the spark plug cap from the spark plug.
- Tilt the mower onto its right side (fuel cap side up) to prevent fuel leaks and carburetor flooding.
- Wear thick leather gloves and hold the blade to keep it from turning. Remove the two blade bolts with your socket wrench.
- Clean the mounting area. Install the new or sharpened blades using the two blade bolts and two special washers.
- Hold the blade with your gloved hand and tighten the bolts with a torque wrench to 36–43 ft-lb (49–59 N·m).
If you don't have a torque wrench, take it to an authorized Honda dealer. Improper torque can cause the blades to loosen and be thrown. Always replace both blades as a set.