For best practice you should be looking to change the cutter blade on your lawnmower before it dulls to much, as dull blades will increase wear on the mower engine and will give the grass a ragged, torn cut resulting in unhealthy for the grass.
GENUINE HONDA ROTARY CUTTING BLADE 72511-VK8-J50 HRX476 HY PK FREE DELIVERY
GENUINE HONDA 21" Cutting Blade 72511-VF0-K60 Fits HRH536 QX HX - FREE DELIVERY
GENUINE HONDA 17" Rotary Blade 72511-VK7-000 Fits HRX426 PDE PXE QXE RXE SD SXE
Genuine Stiga 22.2mm Blade Boss / Pulley For Models Listed 122465607/3
GENUINE HONDA SELF DRIVE CLUTCH CABLE FITS SELECT HRG466C HRG466C1 HRG466K1
Genuine Honda Blade Bolt X 2 fits HRX426 HRX476 HRX537 - All Versions
