Suzuki GSX-R750, Service Manual

Page: 83 / 495

ENGINE 3-35
VALVE STEM DEFLECTION
• Lift the valve about 10 mm (0.39 in) from the valve seat.
• Measure the valve stem deflection in two directions, perpen-
dicular to each other, by positioning the dial gauge as shown.
• If the deflection measured exceeds the limit, then determine
whether the valve or the guide should be replaced with a new
one.
[
09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
Valve stem deflection (IN & EX):
Service Limit: 0.35 mm (0.014 in)
VALVE STEM WEAR
• If the valve stem is worn down to the limit, as measured with a
micrometer, replace the valve.
• If the stem is within the limit, then replace the guide.
• After replacing valve or guide, be sure to recheck the deflec-
tion.
[
09900-20205: Micrometer (0 – 25 mm)
Valve stem O.D.:
Standard (IN) : 3.975 – 3.990 mm (0.1565 – 0.1571 in)
(EX): 3.955 – 3.970 mm (0.1557 – 0.1563 in)
NOTE:
If valve guides have to be removed for replacement after inspect-
ing related parts, carry out the steps shown in valve guide servic-
ing. (
3-36)