Suzuki RA410, Manual

Page: 308 / 761

Valve Springs
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.
For intake valves
ID paindt color: Lighft green
For exhaust valves
ID paint color: Orange
ID paint color: Pink
1
1. ID paint
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 6A4-49
Item Standard Limit
Valve spring
free length
33.13 mm
(1.3043 in.)
32.30 mm
(1.2716 in.)
Valve spring
preload
9.7– 11.3 kg for 28.5 mm
(21.4 – 24.9 lb/1.12 in.)
8.5 kg for 28.5 mm
(18.7 lb/1.12 in.)
Item Standard Limit
Valve spring
free length
36.11 mm
(1.4265 in.)
34.80 mm
(1.3700 in.)
Valve spring
preload
13.5 – 15.5 kg for 28.5 mm
(29.8 – 34.2 lb/1.12 in.)
12.0 kg for 28.5 mm
(26.4 lb/1.12 in.)
Item Standard Limit
Valve spring
free length
36.30 mm
(1.4291 in.)
34.80 mm
(1.3700 in.)
Valve spring
preload
13.5 – 15.5 kg for 28.5 mm
(29.8 – 34.2 lb/1.12 in.)
12.0 kg for 28.5 mm
(26.4 lb/1.12 in.)