Suzuki GSX-R750 Service Manual page 86

CYLINDER HEAD DISTORTION
• Decarbonize the combustion chambers.
• Check the gasketed surface of the cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading at several places indicated.
• If the largest reading at any position of the straightedge
exceeds the limit, replace the cylinder head.
 Cylinder head distortion:
Service Limit: 0.20 mm
 09900-20803: Thickness gauge
VALVE STEM RUNOUT
• Support the valve using V-blocks and check its runout using
the dial gauge as shown.
• If the runout exceeds the service limit, replace the valve.
 Valve stem runout:
Service Limit: 0.05 mm
 09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)

Be careful not to damage the valve and valve stem
when handling it.
VALVE HEAD RADIAL RUNOUT
• Place the dial gauge at a right angle to the valve head face
and measure the valve head radial runout.
• If it measures more than the service limit, replace the valve.
 Valve head radial runout:
Service Limit: 0.03 mm
 09900-20607: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block set (100 mm)

Be careful not to damage the valve and valve stem
when handling it.
VALVE STEM AND VALVE FACE WEAR CONDITION
• Visually inspect each valve stem and valve face for wear and
pitting. If it is worn or damaged, replace the valve with a new
one.
ENGINE 3-33