Suzuki RV125 Service Manual page 62

3-26 ENGINE
• Re-finish the valve guide holes in the cylinder head using the
special tools.
% 09916-34561: Valve guide reamer (11.3 mm)
09916-34542: Handle
NOTE:
Insert the reamer from the combustion chamber side and always
turn the reamer handle clockwise.
• Oil the stem hole of each valve guide and drive the guide into
the guide hole using the special tool.
% 09916-44910: Valve guide remover/installer
"
Be sure to use a new valve guide ring and valve guide.
NOTE:
Install the valve guide until the ring A contacts with the cylinder
head.
• After installing the valve guides, re-finish their guiding bores
using the special tools. Be sure to clean and oil the guides
after reaming.
% 09916-34550: Valve guide reamer (5.5 mm)
09916-34542: Handle
VALVE SEAT WIDTH INSPECTION
Visually check for valve seat width on each valve face.
If the valve face has worn abnormally, replace the valve.
Coat the valve seat with Prussian Blue and set the valve in
place. Rotate the valve with light pressure. Check that the trans-
ferred blue on the valve face is uniform all around and in center
of the valve face.
If the seat width W measured exceeds the standard value, or
seat width is not uniform, reface the seat using the seat cutter.
$ Valve seat width W
Standard: 0.9 – 1.1 mm
% 09916-10911: Valve lapper set
If the valve seat is out of specification, correct the seat by servic-
ing it as follows: