Honda HRN216 Series Manual page 153

CAMSHAFT/CRANKSHAFT/ PISTON/CYLINDER
VALVE FACE/VALVE STEM O.D.
Inspect each valve for face irregularities.
If necessary, replace the valve.
Inspect each valve for bending or abnormal stem wear.
If necessary, replace the valve.
Measure and record each valve stem O.D.
STANDARD: IN/EX: 5.465 – 5.480 mm
SERVICE LIMIT: IN/EX: 5.318 mm (0.2094 in)
If the measurement is less than the service limit, replace the valve.
VALVE GUIDE I.D.
Measure and record each valve guide I.D.
STANDARD: IN: 5.500 – 5.512 mm (0.2165 – 0.2170 in)
EX: 5.540 – 5.552 mm (0.2181 – 0.2186 in)
SERVICE LIMIT: IN: 5.572 mm (0.2194 in)
EX: 5.612 mm (0.2209 in)
If the measured valve guide I.D. is more than the service limit,
replace the cylinder.
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding guide I.D.
to obtain the guide-to-stem clearance.
STANDARD:
IN: 0.020 – 0.047 mm (0.0008 – 0.0019 in)
EX: 0.060 – 0.087 mm (0.0024 – 0.0034 in)
SERVICE LIMIT:
IN: 0.10 mm (0.004 in)
EX: 0.12 mm (0.005 in)
If the calculated clearance is more than the service limit, replace
the valve and the cylinder.
10-30
(0.2152 – 0.2157 in)
VALVE FACE
HRN216