Suzuki DF 40 Service Manual page 173

VALVE / VALVE GUIDE
Valve guide to valve stem clearance
Using a micrometer and bore gauge, take diameter readings
on valve stems and guides to check guide to stem clearance.
Be sure to take readings at more than one place along the length
of each stem and guide.
09900-20205 : Micrometer
Valve stem outside diameter
Using micrometer, measure valve stem outside diameter.
Valve stem outside diameter
Standard:
IN 5.465 – 5.480 mm (0.2152 – 0.2157 in.)
EX 5.440 – 5.455 mm (0.2142 – 0.2148 in.)
Valve guide inside diameter
Using a small bore gauge, measure valve guide inside diam-
eter.
Valve guide inside diameter
Standard :
IN 5.500 – 5.512 mm (0.2165 – 0.2170 in.)
EX 5.500 – 5.512 mm (0.2165 – 0.2170 in.)
Valve guide to valve stem clearance
Valve guide to valve stem clearance
Standard :
IN 0.020 – 0.047 mm (0.0008 – 0.0019 in.)
EX 0.045 – 0.072 mm (0.0018 – 0.0028 in.)
Service limit :
IN 0.070 mm (0.0028 in.)
EX 0.090 mm (0.0035 in.)
If measurement exceeds service limit, replace valve and / or
valve guide.
NOTE:
For valve guide replacement, see "VALVE GUIDE REPLACE-
MENT" section on page 6-35.
POWER UNIT 6-30