Suzuki GA413 Service Manual page 349

Valve Springs
D Referring to data given below, check to be sure that each spring
is in sound condition, free of any evidence of breakage or weak-
ening. Remember, weakened valve springs can cause chatter,
not to mention possibility of reducing power output due to gas
leakage caused by decreased seating pressure.
Item
Valve spring
free length
Valve spring 10.7 – 12.5 kg for 31.5 mm
preload (23.6 – 27.5 lb/1.24 in.)
D Spring squareness:
Use a square and surface plate to check each spring for square-
ness in terms of clearance between end of valve spring and
square. Valve springs found to exhibit a larger clearance than
limit given below must be replaced.
Valve spring squareness limit: 2.0 mm (0.079 in.)
ENGINE MECHANICAL 6A-43
Standard
36.83 mm
(1.4500 in.)
9.3 kg for 31.5 mm
Limit
35.67 mm
(1.4043 in.)
(20.5 lb/1.24 in.)