Suzuki DF70A - Page 152

1D-41 Power Unit Mechanical:
Valve spring free length
Check spring strength by measuring free length.
If lower than service limit, replace valve spring.
Special tool
(A): 09900–20101 (Vernier calipers (150 mm))
Valve spring free length
Standard (IN., EX.): 33.1 mm (1.30 in.)
Service limit (IN., EX.) 31.8 mm (1.25 in.)
Valve spring preload
Measure valve spring preload.
If lower than service limit, replace valve spring.
Special tool
: 09900–20101 (Vernier calipers (150 mm))
Valve spring preload
Standard (IN., EX.): 95 – 111 N (9.6 – 11.2 kg, 21.1 –
24.6 lbs.) at 28.5 mm (1.22 in.)
Service limit (IN., EX.): 87 N (8.8 kg, 19.4 lbs.) at 28.5
mm (1.22 in.)
Valve spring squareness
Use a square and surface plate to check each spring for
squareness (clearance between end of valve spring and
square).
If measurement exceeds service limit, replace valve
spring.
Special tool
: 09900–20101 (Vernier calipers (150 mm))
Valve spring squareness “a”
Service limit (IN., EX.): 2.0 mm (0.079 in.)
(A)
I9J011140054-02
I9J011140055-01
“a”
I9J011140056-02
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