Suzuki DF 40 - Page 180

6-37 POWER UNIT
Valve spring squareness
Use a square and surface plate to check each spring for squareness
(clearance between end of valve spring and square).
09900-20101 : Vernier calipers
Valve spring squareness
Service limit :
IN & EX 2.0 mm (0.079 in.)
If measurement exceeds service limit, replace valve spring.
VALVE SPRING
Valve spring free length
Check spring strength by measuring free length.
09900-20101 : Vernier calipers
Valve spring free length
Standard :
IN & EX 33.13 mm (1.3043 in.)
Service limit :
IN & EX 31.80 mm (1.2520 in.)
If lower than service limit, replace valve spring.
Valve spring preload
Measure valve spring preload.
09900-20101 : Vernier calipers
Valve spring preload
Standard :
IN & EX 95 – 111 N (9.7 – 11.3 kg , 21.4 – 24.9 lbs.)
for 28.5 mm (1.12 in.)
Service limit :
IN & EX 88 N (8.9 kg, 19.6 lbs.) for 28.5mm
(1.12 in.)
If lower than service limit, replace valve spring.
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