Suzuki Boulevard M50, Service Manual, Page: 79 / 454

ENGINE 3-33
• Re-finish the valve guide holes in cylinder head with a 10.8
mm reamer and handle.

09916-34580: Valve guide hole reamer
09916-34542: Reamer handle
• Cool down the new valve guides in a freezer for about one
hour and heat the cylinder head to 100 – 150 °C (212 – 302
°F) with a hot plate.

• Oil the stem hole, too, of each valve guide and drive the guide
into the guide hole with the valve guide installer and attach-
ment.

09916-44910: Valve guide remover/installer
09916-44920: Valve guide installer attachment

• After fitting all valve guides, re-finish their guiding bores with a
5.5 mm reamer. Be sure to clean and oil the guide after ream-
ing.

09916-34550: Valve guide reamer
09916-34542: Reamer handle
NOTE:
* Be sure to cool down the cylinder head to ambient air tempera-
ture.
* Insert the reamer from the combustion chamber and always
turn the reamer handle clockwise.
VALVE SEAT WIDTH
• Coat the valve seat with prussian blue uniformly. Fit the valve
and tap the coated seat with the valve face in a rotating man-
ner, in order to obtain a clear impression of the seating con-
tact.
In this operation, use the valve lapper to hold the valve head.
Do not use a burner to heat the valve guide hole to
prevent cylinder head distortion.
Failure to oil the valve guide hole before driving the
new guide into place may result in a damage guide or
head.
Valve
guide
Cylinder
head
SA
MP
LE