Honda CB HORNET 160R 2015, Руководство по ремонту

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7-15
CYLINDER HEAD/VALVES
Ream the new valve guides.
TOOL:
Valve guide reamer 07984-MA60001
• Take care not to tilt or lean the reamer in the guide while
reaming. Otherwise, the valve is installed slanted, that
causes oil leaks from the stem seal and improper valve
seat contact and results in the valve seat refacing not
able to be performed.
• Insert the reamer from the combustion chamber side
of the head and always rotate the reamer clockwise.
• Use cutting oil on the reamer during this operation.
Clean the cylinder head thoroughly to remove any metal
particles after reaming and reface the valve seat.
VALVE SEAT INSPECTION
Clean the intake and exhaust valves thoroughly to remove
the carbon deposits.
Apply light coating of Prussian Blue to the valve seats.
Tap the valves and seats using a rubber hose or other
hand lapping tool.
Remove the valve and inspect the width of each valve seat.
The valve seat contact should be within the specified width
and even all around the circumference.
STANDARD: 0.9 – 1.1 mm (0.035 – 0.043 in)
SERVICE LIMIT: 1.5 mm (0.06 in)
Valve seat width is not within specification, reface the valve
seat (page 7-16).
SEAT WIDTH
HAND LAPPING TOOL
Inspect the valve seat face for:
• Damaged face:
– Replace the valve and reface the valve seat.
• Uneven seat width:
– Bent or collapsed valve stem;
– Replace the valve and reface the valve seat.
DAMAGED FACE UNEVEN SEAT WIDTH
VALVE GUIDE REAMER