Suzuki DR-Z70 Service Manual page 55

3-23 ENGINE
• Remove the valve oil seal B and valve spring seat C .
ROCKER ARM SHAFT O.D.
Measure the diameter of rocker arm shaft.
Rocker arm shaft O.D. (IN. & EX.):
Standard: 9.981 – 9.990 mm (0.3930 – 0.3933 in)
09900-20205: Micrometer (0 – 25 mm)
ROCKER ARM I.D.
When inspecting the valve rocker arm, the inside diameter of the
valve rocker arm and wear of the camshaft contacting surface
should be checked.
Rocker arm I.D. (IN. & EX.):
Standard: 10.003 – 10.018 mm (0.3938 – 0.3944 in)
09900-20605: Dial calipers
CYLINDER HEAD DISTORTION
Decarbonize the combustion chamber.
Inspect the gasketed surface of the cylinder head for distortion
with a straightedge and thickness gauge, taking a clearance
reading at several places as indicated. If the largest reading at
any position of the straightedge exceeds the limit, replace the
cylinder head.
Cylinder head distortion:
Service Limit: 0.05 mm (0.002 in)
09900-20803: Thickness gauge