84
3.2. Valve spring
3.2.1. Use a square ruler to measure the right
angle of the valve spring. Replace the
spring if it fails to meet the specifications.
[Limit] 1.2mm/0.0472inch
3.2.2. Measure the free state of spring
[Benchmark value] 37mm/1.4567 inch
3.3. Routine checks on throttles
3.3.1. Check to see if there are some
deformations, obvious tears and wears
Check list on valve Unit: mm/inch
3.3.2. Checks on the clearance between
the throttle guiding pipe and throttle
thrusting rod .
3.3.2.1. Use a dial gauge to measure the
inner diameter of the
throttle-guiding pipe, and use a
caliper to measure the outer
diameter.
3.3.2.2. Work out the differences of the
measured values. If it is above the
specified limits, the throttle or the
guiding pipe must be replaced.
Attention The measurement points are
shown as the figure. Work out the
clearance of the final torn and worn section
item
standard limit
wide
IN
0.85 ～ 1.41/ 0.0335 ～
0.0555
—
EX 1.07～1.36 /0.042～0.0535 —
Width of
valve top
IN 1.0±0.2 /0.0394±0.0078
0.75/
0.0295
EX 1.0±0.2 //0.0394±0.0078
0.75/
0.0295
item standard limit
Valve guide Inside
diameter(mm/inch)
φ5.0 /0.1968 —
Valve stem outside
diameter (mm/inch)
φ5.0 /0.1968 —
Spacing
(mm/inch)
IN
0.056～0.020/
0.0022～0.0008
0.07/0.0027
EX
0.066～0.030/
0.0026～0.0012
0.08/0.0031
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