Honda HRN216 Series Manual page 155

CAMSHAFT/CRANKSHAFT/ PISTON/CYLINDER
Prepare a thick paper cylinder or equivalent material with a large
enough diameter to fit against the cylinder wall of the cylinder.
Insert the thick paper into the cylinder to protect the cylinder wall
during valve seat reconditioning.
Valve seat cutters/grinder or equivalent valve seat re-facing
equipment is recommended to correct a worn valve seat.
Turn the cutter clockwise, never counterclockwise. Continue to
turn the cutter as you lift it from the valve seat.
10-32
VALVE
SEAT
CUTTER
HRN216
THICK
PAPER