Honda HRX217K6HYA Manual page 129

CAM PULLEY/CRANKSHAFT/ PISTON/CYLINDER
The 31° cutter removes material from the top edge (contact too
high).
TOOLS:
Cutter holder 5.50 mm
Flat cutter, 30 mm (31° IN/EX) Commercially available
The 60° cutter removes material from the bottom edge (contact too
low).
TOOLS:
Cutter holder 5.5 mm
Interior cutter, 30 mm (60° IN/EX) Commercially available
Be sure that the width of the finished valve seat is within
specification.
STANDARD: 0.7 – 0.9 mm (0.03 – 0.04 in)
SERVICE LIMIT: 1.8 mm (0.07 in)
Make a light pass with the 45° cutter to remove any possible burrs
at the edge of the seat.
TOOLS:
Cutter holder 5.5 mm
Seat cutter, 27.5 mm (45° IN/EX)
After resurfacing the seats, inspect for even valve seating.
Apply Prussian Blue compound or erasable felt-tipped marker ink
to the valve seat. Insert the valve, and snap it closed against its
seat several times. Be sure the valve does not rotate on the seat.
The seating surface, as shown by the transferred marking
compound, should have good contact all the way around.
Thoroughly clean the cylinder head to remove any cutting residual.
Lap the valves into their seats, using a commercially available
valve lapper and lapping compound.
After lapping, wash all residual compound off the cylinder head
and valve.
• Do not push the valve against the seat with force during lapping.
Apply a light pass with the valve lapper.
• Avoid lapping the valve in the same position as it causes
uneven wear. Lap the valve by turning the lapper slowly.
• Take care not to allow the lapping compound to enter the gap
between the stem and guide.
Adjust the valve clearance after assembly
10-24
Commercially available
Commercially available
Commercially available
Commercially available
(P. 3-12).
HRX217HYA • HRX217HZA
CONTACT TO STANDARD
VALVE FACE
CONTACT TOO HIGH
VALVE FACE
VALVE FACE
31°
CONTACT TOO LOW
VALVE FACE
VALVE FACE
60°
VALVE
LAPPER