Cub Cadet Challenger Series Service Manual page 47

Item
Valve Spring:
Inner Spring
Free Length
IN
EX
Set Length
(Valve Closed)
IN
EX
Compressed
pressure (Installed)
IN
EX
Tilt limit *
IN
EX
Direction of winding
750 UV Engine Specifications
Metric
32.63mm
36.46mm
27.5mm
31.0mm
100.0 ~115.7N
120.6 ~138.3N
Both Intake and Exhaust
Standard
(1.28in)
(1.44in)
(1.08in)
(1.22in)
(22.49 ~ 26.01lb)
(27.12 ~ 31.09lb)
Clockwise
2-6
Service Wear
Limit
31.0mm (1.22in)
34.6mm (1.36in)
2.5°/ 1.4 mm
(2.5°/0.055in)
2.5°/1.6 mm
(2.5°/0.063in)