Valve Guide Replacement - Honda CB HORNET 160R 2015 Shop Manual

CYLINDER HEAD/VALVES
Measure and record each valve guide I.D. with a ball gauge
or inside micrometer.
SERVICE LIMIT:
Calculate the stem-to-guide clearance.
SERVICE LIMIT:
• If the stem-to-guide clearance exceeds the service limit,
determine if a new guide with standard dimensions
would bring the clearance within tolerance. If so replace
the guides as necessary and ream to fit.
• If the stem-to-guide clearance still exceeds the service
limit with new guides, replace the valve and guide.
• Reface the valve seat whenever new valve guides are
installed.

VALVE GUIDE REPLACEMENT

Chill the replacement valve guides in the freezer section
of a refrigerator for about an hour.
Heat the cylinder head to 130°C – 140°C (275°F –290°F)
with a hot plate or oven. Do not heat the cylinder head
beyond 150°C (300°F). Use temperature indicator sticks,
available from welding supply stores, to be sure the cylinder
head is heated to the proper temperature.
• Wear insulated gloves to avoid burns when handling
the heated cylinder head.
• Using a torch to heat the cylinder head may cause
warping.
• Be careful not to damage the mating surface.
Support the cylinder head and drive the valve guides
and clips out of the cylinder head from the combustion
chamber side.
TOOL:
Valve guide driver
While the cylinder head is still heated, take off the new
valve guides from the freezer and install the new clips to
the new guides.
Drive new guides in the cylinder head from the camshaft
side.
TOOL:
Valve guide driver
After installing the valve guides, measure the valve guide
height from the cylinder head.
SPECIFIED HEIGHT: 16.8 – 17.0 mm (0.66 – 0.67 in)
Let the cylinder head cool to room temperature.
7-14
IN/EX: 5.04 mm (0.198 in)
IN: 0.07 mm (0.003 in)
EX: 0.09 mm (0.004 in)
07942-8920000
07942-8920000
VALVE GUIDE DRIVER
VALVE GUIDE DRIVER
CLIP