Valve Spring; Cylinder Head; Valve Stem - Suzuki GN125F Service Manual

Measure the runout with a dial gauge
shaft if the runout exceeds the limit.
Camshaft runout limit: 0.1 mm
09900-20606: Dial gauge (1/100 mm)
09900-20701: Magnetic stand
09900-21304: V-block ( 100 mm)

VALVE SPRING

Measure the valve spring free length.
Valve spring free length imit:
IN.: 31.24 mm
09900 20103: Vernier calipers -

CYLINDER HEAD

Check the spark plug hole and valve of combustion chamber
part for scratch.
Check the gasketed surface of the cylinder head for distor-
tion with a straightedge and thickness gauge.
Cylinder head distortion limit: 0.05 mm
09900-20803:Thickness gauge

VALVE STEM

Check the valve stem for bending, pitting or abnormal wear.
Measure the valve stem O.D.
Valve stem O.D.:
IN.: 4.975-4.99 mm
09900-20205 : Micrometer (0~25 mm)
Measure the thickness
have been reduced to the limit, replace the valve.
Valve face thickness limit: 0.5 mm
Visually inspect each valve for wear of its seating
face. Replace any valve with an abnormally worn face.
.
Replace the cam-
EX.: 33.58 mm
EX.: 4.955-4.97 mm
, and if the thickness is found to
A
ENGINE
3-10
A