SPEC
60
Model
RS90RX/RS90GTX/RS90GTAX/RS90LTX/RS90LTGTX
Valve spring:
Free length
Intake
39.73 mm (1.56 in)
<Limit>
37.74 mm (1.49 in)
Exhaust
39.73 mm (1.56 in)
<Limit>
37.74 mm (1.49 in)
Installed length (valve closed)
Intake
33.0 mm (1.30 in)
Exhaust
33.0 mm (1.30 in)
Compressed spring force (installed)
Intake
136 ~ 158 N (13.9 ~ 16.1 kg, 30.6 ~ 35.5 lb)
Exhaust
136 ~ 158 N (13.9 ~ 16.1 kg, 30.6 ~ 35.5 lb)
Spring tilt
Intake
2.5°/1.7 mm (0.07 in)
Exhaust
2.5°/1.7 mm (0.07 in)
Winding direction (top view)
Intake
Clockwise
Exhaust
Clockwise
Valve lifter:
Valve lifter outside diameter
Intake
24.482 ~ 24.488 mm (0.9639 ~ 0.9641 in)
<Limit>
24.457 mm (0.9629 in)
Exhaust
24.482 ~ 24.488 mm (0.9639 ~ 0.9641 in)
<Limit>
24.457 mm (0.9629 in)
Valve lifter hole inside diameter
Intake
24.500 ~ 24.518 mm (0.9646 ~ 0.9653 in)
<Limit>
24.548 mm (0.9665 in)
Exhaust
24.500 ~ 24.518 mm (0.9646 ~ 0.9653 in)
<Limit>
24.548 mm (0.9665 in)
Piston:
Piston size (D)
78.935 ~ 78.950 mm (3.1077 ~ 3.1083 in)
Measuring point (H)
5.0 mm (0.20 in)
Piston to-cylinder clearance
0.050 ~ 0.075 mm (0.0020 ~ 0.0030 in)
<Limit>
0.12 mm (0.0047 in)
Piston pin bore off set
0.5 mm (0.0197 in)
Off-set direction
Exhaust side
Piston pin bore inside diameter
19.004 ~ 19.015 mm (0.7482~ 0.7486 in)
<Limit>
19.045 mm (0.7498 in)
Piston pin:
Piston pin outside diameter
18.991 ~ 19.000 mm (0.7477 ~ 0.7480 in)
<Limit>
18.971 mm (0.7469 in)
Piston pin length
52.9 ~ 53.0 mm (2.083 ~ 2.087 in)
Piston pin to piston pin bore clearance 0.004 ~ 0.024 mm (0.0002 ~ 0.0009 in)
<Limit>
0.074 mm (0.0029 in)
MAINTENANCE SPECIFICATIONS