Honda SH300 2006 Manual page 226

CYLINDER HEAD/VALVES
Check the camshaft boss for wear or damage.
Check the camshaft holder hole for wear or damage.
ROCKET ARM/SHAFT
Inspect the sliding surfaces of the rocker arms and
shafts for wear or damage.
Check the oil holes for clogs.
Measure the O.D. of each shaft at the rocker arm
sliding areas and record it.
SERVICE LIMIT: 12.91 mm (0.508 in)
Measure the I.D. of each rocker arm and record it.
SERVICE LIMIT: 13.10 mm (0.516 in)
Subtract each rocker arm shaft O.D. from the corre-
sponding rocker arm I.D. to obtain the arm-to-shaft
clearance.
SERVICE LIMIT: 0.08 mm (0.003 in)
SIDE SPRING
Measure the free length of the springs.
SERVICE LIMIT: 15.5 mm (0.61 in)
9-10
CAMSHAFT BOSS
CAMSHAFT HOLE