Inspecting The Camshaft - Derbi GPR125 Workshop Manual

4 - ENGINE
VALVE SPRINGS (a)
Inlet, free length: 33,24 mm
Exhaust, free length: 33,24 mm
Inlet, working length (valve closed): 26 mm
Exhaust, working length (valve closed): 26 mm
Inlet, work load: 101,87-116,13 N (10,19-11,61 Kgf)
Exhaust, work load: 101,87-116,13 N (10,19-11,61 Kgf)
- Spring contact face.
Wear/damage/scratches => Renew.

INSPECTING THE CAMSHAFT

1. Check:
- Geometry of the cams (standard values).
CAM SIZE
Inlet "A": 31,44-31,54 mm
Inlet "B": 23,95-24,05 mm
Inlet (lifted) "C": 7,49 mm
Exhaust "A": 30,81-30,91 mm
Exhaust "B": 23,95-24,05 mm
Exhaust (lifted) "C": 6,86 mm
Grooves/scratches/blue colouring => Renew.
2. Inspect:
MAXIMUM CAMSHAFT WARP
Inlet: 0,008 mm
Exhaust: 0,008 mm
MAXIMUM CAMSHAFT AXIAL PLAY
Inlet: 0,4 mm
Exhaust: 0,4 mm
Outside that specified => Renew.
110
C
A
B