Cub Cadet Challenger Series Service Manual page 51

Intake
Exhaust
Camshaft run out limit
Cam chain
Number of links
Cam chain adjustment method
Valve spring
Inner spring
Free length
Outside spring
Within spring
Set length (valve closed),
Outside spring
Within spring
Compressed pressure
(installed)
Outside spring
Within spring
550 UV Engine Specifications
"A"
32.30~32.20mm
( 1.271~1.268Iin)
"B"
40.88~40.78mm
(1.6094~1.6055in)
32.30-32.30mm
"A"
( 1.272~1.268in) ,
"B"'
40.95~40.85mm
(1.6122~1.6083in)
124
Automatic
42.5mm(1.67in)
IN
42.5mm(1.67in)
EX
39.0mm(1.54)
IN
39.0mm(1.54)
EX
36.0mm(1.42in)
IN
36.0mm(1.42in)
EX
33.0mm(1.30in)
IN
33.0mm(1.30in)
EX
240.0~260.0N(24.49~26.53)
IN
240.0~260.0N(24.49~26.53)
EX
IN
110.0~130.0N(11.22~13.27kg)
110.0~130.0N(11.22~13.27kg)
EX
2-10